2c4a

Structure of Neuraminidase Subtype N9 Complexed with 30 MM Sialic Acid (NANA, NEU5AC), Crystal Soaked for 3 Hours at 291 K.

Method: X-RAY DIFFRACTION D_max: 78.2 Å Quality: GOOD

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1. Protein Identity and Related Structures Protein Identity & Related Structures

NEURAMINIDASE SUBTYPE N9

INFLUENZA A VIRUS

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Other combination Homooligomer Protein × 4 其他Polymer 8 PDB declaration: tetrameric（4） Consistent with protein copy count	Chain A； UniProt 83–470	Fragment：RESIDUES 83-470	;alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose ; × 4 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 4 SIA N-acetyl-alpha-neuraminic acid × 8 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions：pH 6.8；PROTEIN WAS CRYSTALLISED FROM 1.9M POTASSIUM PHOSPHATE PH 6.8, THEN SOAKED FOR 3 HOURS IN 30 MM NEU5AC	Resolution 2.15 Å R-free 0.205

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

Other PDB	Difference from Current Entry 2C4A	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
1A14 COMPLEX BETWEEN NC10 ANTI-INFLUENZA VIRUS NEURAMINIDASE SINGLE CHAIN ANTIBODY WITH A 5 RESIDUE LINKER AND INFLUENZA VIRUS NEURAMINIDASE Deposited 1997-12-21	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric	Chain N 83–470（388 aa） Fragment：RESIDUES 82 - 468	Not recorded	MAN alpha-D-mannopyranose × 4 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 6.6；NC10 SCFV(5) AND N9 NA WERE MIXED TOGETHER (SCFV(5) IN FOUR-FOLD MOLAR EXCESS) WITH AND EQUAL VOLUME OF POTASSIUM PHOSPHATE BUFFER 1.7M PH6.6. THE DROP WAS EQUILIBRATED BY VAPOR DIFFUSION AGAINST PHOSPHATE BUFFER 1.3M PH6.8., vapor diffusion	Resolution 2.50 Å R-free 0.270
1BJI THE X-RAY STRUCTURE OF A COMPLEX OF TERN N9 INFLUENZA VIRUS NEURAMINIDASE COMPLEXED WITH THE GLAXO 6-CARBOXAMIDE SIALIC ACID ANALOGUE GR217029 Deposited 1997-12-03	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：RESIDUES 82 - 468	Not recorded	MAN alpha-D-mannopyranose × 4 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CA CALCIUM ION × 4 DPC 5-ACETYLAMINO-4-AMINO-6-(PHENETHYL-PROPYL-CARBAMOYL)-5,6-DIHYDRO-4H-PYRAN-2-CARBOXYLIC ACID × 4	X-RAY DIFFRACTION X-ray crystallization conditions pH 7；1.9M PHOSPHATE(PH 5.9) THE GLAXO 6-CARBOXAMIDE COMPOUND GR217029 WAS SOAKED IN TERN N9 NEURAMININDASE CRYSTALS AT 5 MM FOR 24HR. THIS EXPERIMENT WAS CARRIED OUT TO DETERMINE THE BINDING MODE OF THE 6-CARBOXAMIDE HYDROPHOBIC GROUP. A NEW HYDROPHOBIC POCKET WAS DISCOVERED EARLIER WITH A METHYL, ETHYL GROUP ATTACHED TO THE AMIDE OF TH3E SIX-CARBOXAMIDE. THIS COMPOUND HAS A MUCH LARGER HYDROPHOBIC GROUP ATTACHED., pH 7.0	Resolution 2.00 Å
1INY A SIALIC ACID DERIVED PHOSPHONATE ANALOG INHIBITS DIFFERENT STRAINS OF INFLUENZA VIRUS NEURAMINIDASE WITH DIFFERENT EFFICIENCIES Deposited 1994-09-26	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CA CALCIUM ION × 4 EQP (1R)-4-acetamido-1,5-anhydro-2,4-dideoxy-1-phosphono-D-glycero-D-galacto-octitol × 4	X-RAY DIFFRACTION X-ray crystallization conditions NATIVE CRYSTALS SOAKED IN 10MM EPANA SOLUTION, PH 7.2.	Resolution 2.40 Å
1L7F Crystal structure of influenza virus neuraminidase in complex with BCX-1812 Deposited 2002-03-15	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：integral membrane protein, membrane stalk cleaved by pronase releasing fully active residues 82-468	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 8 BCZ 3-(1-ACETYLAMINO-2-ETHYL-BUTYL)-4-GUANIDINO-2-HYDROXY-CYCLOPENTANECARBOXYLIC ACID × 4 GOL GLYCEROL × 12	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；293 K；phosphate, pH 5.9, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 1.80 Å R-free 0.187
1L7G Crystal structure of E119G mutant influenza virus neuraminidase in complex with BCX-1812 Deposited 2002-03-15	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：integral membrane protein, membrane stalk cleaved by pronase releasing fully active residues 82-468	Mutation：E119G	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 8 BCZ 3-(1-ACETYLAMINO-2-ETHYL-BUTYL)-4-GUANIDINO-2-HYDROXY-CYCLOPENTANECARBOXYLIC ACID × 4 GOL GLYCEROL × 12	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；293 K；phosphate, pH 5.9, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 1.85 Å R-free 0.168
1L7H Crystal structure of R292K mutant influenza virus neuraminidase in complex with BCX-1812 Deposited 2002-03-15	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：integral membrane protein, membrane stalk cleaved by pronase releasing fully active residues 82-468	Mutation：R292K	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 12 BCZ 3-(1-ACETYLAMINO-2-ETHYL-BUTYL)-4-GUANIDINO-2-HYDROXY-CYCLOPENTANECARBOXYLIC ACID × 4 GOL GLYCEROL × 12	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；293 K；phosphate, pH 5.9, VAPOR DIFFUSION, HANGING DROP, temperature 293K	Resolution 1.85 Å R-free 0.177
1MWE THE X-RAY STRUCTURE OF A COMPLEX OF TERN N9 INFLUENZA VIRUS NEURAMINIDASE COMPLEXED WITH SIALIC ACID AT 4 DEGREES C REVEALING A SECOND SIALIC ACID BINDING SITE Deposited 1997-08-27	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：RESIDUES 82 - 468	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 12 SIA N-acetyl-alpha-neuraminic acid × 8 CA CALCIUM ION × 8	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.9；1.9M PHOSPHATE (PH 5.9)	Resolution 1.70 Å
1NCA REFINED CRYSTAL STRUCTURE OF THE INFLUENZA VIRUS N9 NEURAMINIDASE-NC41 FAB COMPLEX Deposited 1992-01-21	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric	Chain N 82–470（389 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CA CALCIUM ION × 4	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.50 Å
1NCA REFINED CRYSTAL STRUCTURE OF THE INFLUENZA VIRUS N9 NEURAMINIDASE-NC41 FAB COMPLEX Deposited 1992-01-21	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Heteromer；Protein × 20 PDB declaration: eicosameric	Chain N 82–470（389 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 16 CA CALCIUM ION × 8	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.50 Å
1NCB CRYSTAL STRUCTURES OF TWO MUTANT NEURAMINIDASE-ANTIBODY COMPLEXES WITH AMINO ACID SUBSTITUTIONS IN THE INTERFACE Deposited 1992-01-21	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric	Chain N 82–470（389 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 4	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.50 Å
1NCB CRYSTAL STRUCTURES OF TWO MUTANT NEURAMINIDASE-ANTIBODY COMPLEXES WITH AMINO ACID SUBSTITUTIONS IN THE INTERFACE Deposited 1992-01-21	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Heteromer；Protein × 20 PDB declaration: eicosameric	Chain N 82–470（389 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CA CALCIUM ION × 8	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.50 Å
1NCC CRYSTAL STRUCTURES OF TWO MUTANT NEURAMINIDASE-ANTIBODY COMPLEXES WITH AMINO ACID SUBSTITUTIONS IN THE INTERFACE Deposited 1992-01-21	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric	Chain N 82–470（389 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CA CALCIUM ION × 4	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.50 Å
1NMC COMPLEX BETWEEN NC10 ANTI-INFLUENZA VIRUS NEURAMINIDASE SINGLE CHAIN ANTIBODY WITH A 15 RESIDUE LINKER AND INFLUENZA VIRUS NEURAMINIDASE Deposited 1997-12-21	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric	Chain N 83–470（388 aa） Fragment：RESIDUES 82 - 468	Not recorded	MAN alpha-D-mannopyranose × 4 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.6；NC10 SCFV(15) AND N9 NA WERE MIXED TOGETHER (SCFV(15) IN SLIGHT MOLAR EXCESS) WITH AND EQUAL VOLUME OF POTASSIUM PHOSPHATE BUFFER 1.7M PH6.6. THE DROP WAS EQUILIBRATED BY VAPOUR DIFFUSION AGAINST PHOSPHATE BUFFER 1.3M PH6.8.	Resolution 2.50 Å R-free 0.260
1NMC COMPLEX BETWEEN NC10 ANTI-INFLUENZA VIRUS NEURAMINIDASE SINGLE CHAIN ANTIBODY WITH A 15 RESIDUE LINKER AND INFLUENZA VIRUS NEURAMINIDASE Deposited 1997-12-21	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Heteromer；Protein × 12 PDB declaration: dodecameric	Chain A 83–470（388 aa） Fragment：RESIDUES 82 - 468	Not recorded	MAN alpha-D-mannopyranose × 4 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.6；NC10 SCFV(15) AND N9 NA WERE MIXED TOGETHER (SCFV(15) IN SLIGHT MOLAR EXCESS) WITH AND EQUAL VOLUME OF POTASSIUM PHOSPHATE BUFFER 1.7M PH6.6. THE DROP WAS EQUILIBRATED BY VAPOUR DIFFUSION AGAINST PHOSPHATE BUFFER 1.3M PH6.8.	Resolution 2.50 Å R-free 0.260
1NNA THREE-DIMENSIONAL STRUCTURE OF INFLUENZA A N9 NEURAMINIDASE AND ITS COMPLEX WITH THE INHIBITOR 2-DEOXY 2,3-DEHYDRO-N-ACETYL NEURAMINIC ACID Deposited 1993-03-08	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 84–470（387 aa）	Not recorded	CA CALCIUM ION × 4	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.50 Å
1NNB THREE-DIMENSIONAL STRUCTURE OF INFLUENZA A N9 NEURAMINIDASE AND ITS COMPLEX WITH THE INHIBITOR 2-DEOXY 2,3-DEHYDRO-N-ACETYL NEURAMINIC ACID Deposited 1993-03-08	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 84–470（387 aa）	Not recorded	CA CALCIUM ION × 4 DAN 2-DEOXY-2,3-DEHYDRO-N-ACETYL-NEURAMINIC ACID × 4	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.80 Å
1NNC INFLUENZA VIRUS NEURAMINIDASE SUBTYPE N9 (TERN) COMPLEXED WITH 4-GUANIDINO-NEU5AC2EN INHIBITOR Deposited 1995-03-15	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa）	Not recorded	MAN alpha-D-mannopyranose × 4 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CA CALCIUM ION × 4 ZMR ZANAMIVIR × 4	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 1.80 Å
1XOE N9 Tern influenza neuraminidase complexed with (2R,4R,5R)-5-(1-Acetylamino-3-methyl-butyl-pyrrolidine-2, 4-dicarobyxylic acid 4-methyl esterdase complexed with Deposited 2004-10-06	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Monomer；Protein × 1 PDB declaration: monomeric	Chain A 84–470（387 aa） Fragment：N9 tern Influenza Neuraminidase	Not recorded	MAN alpha-D-mannopyranose × 1 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 ABX 5-[1-(ACETYLAMINO)-3-METHYLBUTYL]-4-(METHOXYCARBONYL)PROLINE × 1	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.20 Å R-free 0.315
1XOE N9 Tern influenza neuraminidase complexed with (2R,4R,5R)-5-(1-Acetylamino-3-methyl-butyl-pyrrolidine-2, 4-dicarobyxylic acid 4-methyl esterdase complexed with Deposited 2004-10-06	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 84–470（387 aa） Fragment：N9 tern Influenza Neuraminidase	Not recorded	MAN alpha-D-mannopyranose × 4 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 ABX 5-[1-(ACETYLAMINO)-3-METHYLBUTYL]-4-(METHOXYCARBONYL)PROLINE × 4	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.20 Å R-free 0.315
1XOG N9 Tern Influenza neuraminidase complexed with a 2,5-Disubstituted tetrahydrofuran-5-carboxylic acid Deposited 2004-10-06	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 84–470（387 aa） Fragment：N9 Tern neuraminidas	Not recorded	MAN alpha-D-mannopyranose × 4 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 ABW 5-[1-(ACETYLAMINO)-3-METHYLBUTYL]-2,5-ANHYDRO-3,4-DIDEOXY-4-(METHOXYCARBONYL)PENTONIC ACID × 4	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.80 Å R-free 0.297
2C4L Structure of Neuraminidase Subtype N9 Complexed with 30 MM Sialic Acid (NANA, NEU5AC), Crystal Soaked for 24 Hours at 291 K and Finally Backsoaked for 30 Min in a Cryoprotectant Solution which did not contain NEU5AC Deposited 2005-10-20	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：RESIDUES 83-470	Not recorded	SIA N-acetyl-alpha-neuraminic acid × 8 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 20 BMA beta-D-mannopyranose × 20 CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions pH 6.8；PROTEIN WAS CRYSTALLISED FROM 1.9M POTASSIUM PHOSPHATE PH 6.8, THEN SOAKED FOR 24 HOURS IN 30 MM NEU5AC AND FINALLY BACKSOAKED FOR 30 MIN IN A CRYOPROTECTANT SOLUTION WHICH DID NOT CONTAIN NEU5AC	Resolution 2.15 Å R-free 0.196
2QWA THE X-RAY STRUCTURE OF A DRUG RESISTANT VARIANT R292K OF TERN N9 INFLUENZA VIRUS NEURAMINIDASE Deposited 1998-04-07	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：RESIDUES 82 - 468	Mutation：R292K (N2-TOKYO/67 NUMBERING)	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 8	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.9；1.9M PHOSPHATE (PH 5.9)	Resolution 1.70 Å
2QWB THE X-RAY STRUCTURE OF A COMPLEX OF SIALIC ACID AND A DRUG RESISTANT VARIANT R292K OF TERN N9 INFLUENZA VIRUS NEURAMINIDASE Deposited 1998-04-07	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：RESIDUES 82 - 468	Mutation：R292K (N2-TOKYO/67 NUMBERING)	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 SIA N-acetyl-alpha-neuraminic acid × 8 CA CALCIUM ION × 8	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.9；1.9M PHOSPHATE (PH 5.9)	Resolution 2.00 Å
2QWC THE X-RAY STRUCTURE OF A COMPLEX OF NEU5AC2EN AND A DRUG RESISTANT VARIANT R292K OF TERN N9 INFLUENZA VIRUS NEURAMINIDASE Deposited 1998-04-07	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：RESIDUES 82 - 468	Mutation：R292K (N2-TOKYO/67 NUMBERING)	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 8 DAN 2-DEOXY-2,3-DEHYDRO-N-ACETYL-NEURAMINIC ACID × 4	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.9；1.9M PHOSPHATE (PH 5.9)	Resolution 1.60 Å
2QWD THE X-RAY STRUCTURE OF A COMPLEX OF 4-AMINO-NEU5AC2EN AND A DRUG RESISTANT VARIANT R292K OF TERN N9 INFLUENZA VIRUS NEURAMINIDASE Deposited 1998-04-07	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：RESIDUES 82 - 468	Mutation：R292K (N2-TOKYO/67 NUMBERING)	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 8 4AM 4-AMINO-2-DEOXY-2,3-DEHYDRO-N-ACETYL-NEURAMINIC ACID × 4	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.9；1.9M PHOSPHATE (PH 5.9)	Resolution 2.00 Å
2QWE THE X-RAY STRUCTURE OF A COMPLEX OF 4-GUANIDINO-NEU5AC2EN AND A DRUG RESISTANT VARIANT R292K OF TERN N9 INFLUENZA VIRUS NEURAMINIDASE Deposited 1998-04-07	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：RESIDUES 82 - 468	Mutation：R292K (N2-TOKYO/67 NUMBERING)	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 8 ZMR ZANAMIVIR × 4	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.9；1.9M PHOSPHATE (PH 5.9)	Resolution 2.00 Å
2QWF THE X-RAY STRUCTURE OF A COMPLEX OF N-ACETYL-4-GUANIDINO-6-METHYL(PROPYL)CARBOXAMIDE-4,5-DIHYDRO-2H-PYRAN-2-CARBOXYLIC ACID AND A DRUG RESISTANT VARIANT R292K OF TERN N9 INFLUENZA VIRUS NEURAMINIDASE Deposited 1998-04-07	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：RESIDUES 82 - 468	Mutation：R292K (N2-TOKYO/67 NUMBERING)	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 8 G20 5-N-acetyl-4-guanidino-6-methyl(propyl) carboxamide-4,5-dihydro-2H-pyran-2-carboxylic acid × 4	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.9；1.9M PHOSPHATE (PH 5.9)	Resolution 1.90 Å
2QWG THE X-RAY STRUCTURE OF A COMPLEX OF 5-N-ACETYL-4-AMINO-6-DIETHYLCARBOXAMIDE-4,5-DIHYDRO-2H-PYRAN-2-CARBOXYLIC ACID AND A DRUG RESISTANT VARIANT R292K OF TERN N9 INFLUENZA VIRUS NEURAMINIDASE Deposited 1998-04-07	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：RESIDUES 82 - 468	Mutation：R292K (N2-TOKYO/67 NUMBERING)	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 8 G28 5-N-acetyl-4-amino-6-diethyl carboxamide-4,5-dihydro-2H-pyran-2-carboxylic acid × 4	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.9；1.9M PHOSPHATE (PH 5.9)	Resolution 1.80 Å
2QWH THE X-RAY STRUCTURE OF A COMPLEX OF 5-N-ACETYL-5-AMINO-3-(1-ETHYLPROPOXY)-1-CYCLOHEXENE-1-CARBOXYLIC ACID (GS4071) AND A DRUG RESISTANT VARIANT R292K OF TERN N9 INFLUENZA VIRUS NEURAMINIDASE Deposited 1998-04-07	Different construct Different mutation/modification Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：RESIDUES 82 - 468	Mutation：R292K (N2-TOKYO/67 NUMBERING)	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 G39 (3R,4R,5S)-4-(acetylamino)-5-amino-3-(pentan-3-yloxy)cyclohex-1-ene-1-carboxylic acid × 4 CA CALCIUM ION × 8	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.9；1.9M PHOSPHATE (PH 5.9)	Resolution 1.80 Å
2QWI THE X-RAY STRUCTURE OF A COMPLEX OF N-ACETYL-4-GUANIDINO-6-METHYL(PROPYL)CARBOXAMIDE-4,5-DIHYDRO-2H-PYRAN-2-CARBOXYLIC ACID AND WILDTYPE TERN N9 INFLUENZA VIRUS NEURAMINIDASE Deposited 1998-04-07	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：RESIDUES 82 - 468	Not recorded	MAN alpha-D-mannopyranose × 4 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CA CALCIUM ION × 4 G20 5-N-acetyl-4-guanidino-6-methyl(propyl) carboxamide-4,5-dihydro-2H-pyran-2-carboxylic acid × 4	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.9；1.9M PHOSPHATE (PH 5.9)	Resolution 2.00 Å
2QWJ THE X-RAY STRUCTURE OF A COMPLEX OF 5-N-ACETYL-4-AMINO-6-DIETHYLCARBOXAMIDE-4,5-DIHYDRO-2H-PYRAN-2-CARBOXYLIC ACID AND A DRUG RESISTANT VARIANT R292K OF TERN N9 INFLUENZA VIRUS NEURAMINIDASE Deposited 1998-04-07	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：RESIDUES 82 - 468	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 8 G28 5-N-acetyl-4-amino-6-diethyl carboxamide-4,5-dihydro-2H-pyran-2-carboxylic acid × 4	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.9；1.9M PHOSPHATE (PH 5.9)	Resolution 2.00 Å
2QWK THE X-RAY STRUCTURE OF A COMPLEX OF 5-N-ACETYL-5-AMINO-3-(1-ETHYLPROPOXY)-1-CYCLOHEXENE-1-CARBOXYLIC ACID (GS4071) AND WILDTYPE TERN N9 INFLUENZA VIRUS NEURAMINIDASE Deposited 1998-04-07	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：RESIDUES 82 - 468	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 G39 (3R,4R,5S)-4-(acetylamino)-5-amino-3-(pentan-3-yloxy)cyclohex-1-ene-1-carboxylic acid × 4 CA CALCIUM ION × 8	X-RAY DIFFRACTION X-ray crystallization conditions pH 5.9；1.9M PHOSPHATE (PH 5.9)	Resolution 1.80 Å
3NN9 REFINED ATOMIC STRUCTURES OF N9 SUBTYPE INFLUENZA VIRUS NEURAMINIDASE AND ESCAPE MUTANTS Deposited 1991-03-28	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CA CALCIUM ION × 4	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.30 Å
3W09 Influenza virus neuraminidase subtype N9 (TERN) complexed with 2,3-dif guanidino-neu5ac2en inhibitor Deposited 2012-10-25	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 GOL GLYCEROL × 28 ZGE 5-acetamido-2,6-anhydro-4-carbamimidamido-3,4,5-trideoxy-3-fluoro-D-glycero-D-galacto-non-2-enonic acid × 4 CA CALCIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.9；298 K；1.9M ammonium phosphate, pH 5.9, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 2.00 Å R-free 0.189
4DGR Influenza Subtype 9 Neuraminidase Benzoic Acid Inhibitor Complex Deposited 2012-01-26	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 82–470（389 aa） Fragment：neuraminidase	Not recorded	BGC beta-D-glucopyranose × 12 GLC alpha-D-glucopyranose × 4 3LV 4-[2,2-bis(hydroxymethyl)-5-oxopyrrolidin-1-yl]-3-[(dipropylamino)methyl]benzoic acid × 4 PO4 PHOSPHATE ION × 4 CA CALCIUM ION × 8 K POTASSIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.9；298 K；1.9 M phosphate buffer, pH 6.9, VAPOR DIFFUSION, HANGING DROP, temperature 298K	Resolution 1.55 Å R-free 0.152
4NN9 REFINED ATOMIC STRUCTURES OF N9 SUBTYPE INFLUENZA VIRUS NEURAMINIDASE AND ESCAPE MUTANTS Deposited 1991-03-28	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CA CALCIUM ION × 4	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.30 Å
4WEG influenza virus neuraminidase N9 in complex 2,3-difluorosialic acid Deposited 2014-09-10	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：UNP residues 83-470	Not recorded	SFJ (2R,3R,4R,5R,6R)-5-acetamido-2,3-difluoro-4-hydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]tetrahydro-2H-pyran-2-carboxylic acid × 4 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 4 DF4 (3R,4R,5R,6R)-5-(acetylamino)-3-fluoro-4-hydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]-3,4,5,6-tetrahydropyranium-2-carboxylate × 4 FSI 5-acetamido-3,5-dideoxy-3-fluoro-D-erythro-alpha-L-manno-non-2-ulopyranosonic acid × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.7；293 K；1.7M potassium phosphate	Resolution 2.10 Å R-free 0.201
5NN9 REFINED ATOMIC STRUCTURES OF N9 SUBTYPE INFLUENZA VIRUS NEURAMINIDASE AND ESCAPE MUTANTS Deposited 1991-03-28	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CA CALCIUM ION × 4	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.30 Å
5W26 INFLUENZA VIRUS NEURAMINIDASE N9 IN COMPLEX WITH 4-DEOXYGENATED 2,3-DIFLUORO-N-ACETYLNEURAMINIC ACID Deposited 2017-06-05	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：UNP RESIDUES 82-469	Not recorded	9SG (2R,3R,5R,6R)-5-acetamido-2,3-bis(fluoranyl)-6-[(1R,2R)-1,2,3-tris(oxidanyl)propyl]oxane-2-carboxylic acid × 4 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 4 9WM (2~{R},3~{R},5~{R})-3-acetamido-5-fluoranyl-2-[(1~{R},2~{R})-1,2,3-tris(oxidanyl)propyl]-2,3,4,5-tetrahydropyran-1-ium-6-carboxylic acid × 4 9VP 5-acetamido-2,6-anhydro-3,4,5-trideoxy-3-fluoro-D-erythro-L-gluco-nononic acid × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.7；298 K；1.7M POTASSIUM PHOSPHATE	Resolution 1.90 Å R-free 0.177
5W2U INFLUENZA VIRUS NEURAMINIDASE N9 IN COMPLEX WITH 7-DEOXYGENATED 2,3-DIFLUORO-N-ACETYLNEURAMINIC ACID Deposited 2017-06-06	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：UNP RESIDUES 82-469	Not recorded	9SM (2R,3R,4R,5R,6S)-5-acetamido-6-[(2S)-2,3-bis(oxidanyl)propyl]-2,3-bis(fluoranyl)-4-oxidanyl-oxane-2-carboxylic acid × 4 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 4 9S4 (2~{S},3~{R},4~{R},5~{R})-3-acetamido-2-[(2~{S})-2,3-bis(oxidanyl)propyl]-5-fluoranyl-4-oxidanyl-2,3,4,5-tetrahydropyran-1-ium-6-carboxylic acid × 4 9SJ 5-acetamido-2,6-anhydro-3,5,7-trideoxy-3-fluoro-D-threo-L-galacto-nononic acid × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.7；289 K；1.7M POTASSIUM PHOSPHATE	Resolution 2.00 Å R-free 0.187
5W2W INFLUENZA VIRUS NEURAMINIDASE N9 IN COMPLEX WITH 8-DEOXYGENATED 2,3-DIFLUORO-N-ACETYLNEURAMINIC ACID Deposited 2017-06-07	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：UNP RESIDUES 82-469	Not recorded	9SP (2R,3R,4R,5R,6R)-5-acetamido-6-[(1R)-1,3-bis(oxidanyl)propyl]-2,3-bis(fluoranyl)-4-oxidanyl-oxane-2-carboxylic acid × 4 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 4 9SD (2~{R},3~{R},4~{R},5~{R})-3-acetamido-2-[(1~{R})-1,3-bis(oxidanyl)propyl]-5-fluoranyl-4-oxidanyl-2,3,4,5-tetrahydropyran-1-ium-6-carboxylic acid × 4 9S7 5-acetamido-2,6-anhydro-3,5,8-trideoxy-3-fluoro-D-threo-L-galacto-nononic acid × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.7；298 K；1.7M POTASSIUM PHOSPHATE	Resolution 1.85 Å R-free 0.171
5W2Y INFLUENZA VIRUS NEURAMINIDASE N9 IN COMPLEX WITH 9-DEOXYGENATED 2,3-DIFLUORO-N-ACETYLNEURAMINIC ACID Deposited 2017-06-07	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Fragment：UNP RESIDUES 82-469	Not recorded	9T7 (2R,3R,4R,5R,6R)-5-acetamido-6-[(1R,2R)-1,2-bis(oxidanyl)propyl]-2,3-bis(fluoranyl)-4-oxidanyl-oxane-2-carboxylic acid × 4 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 4 9TM (2~{R},3~{R},4~{R},5~{R})-3-acetamido-2-[(1~{R},2~{R})-1,2-bis(oxidanyl)propyl]-5-fluoranyl-4-oxidanyl-2,3,4,5-tetrahydropyran-1-ium-6-carboxylic acid × 4 9T1 5-acetamido-2,6-anhydro-3,5,9-trideoxy-3-fluoro-D-erythro-L-gluco-non-4-ulosonic acid × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.7；298 K；1.7M POTASSIUM PHOSPHATE	Resolution 2.39 Å R-free 0.198
6CRD INFLUENZA VIRUS NEURAMINIDASE SUBTYPE N9 (TERN) with tetrabrachion (TB) domain stalk Deposited 2018-03-16	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Insufficient information Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa） Chain B 83–470（388 aa） Chain E 83–470（388 aa） Chain H 83–470（388 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 5	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7；293 K；100 mM HEPES buffer at pH7.0 with 10% PEG6000	Resolution 2.57 Å R-free 0.306
6CRD INFLUENZA VIRUS NEURAMINIDASE SUBTYPE N9 (TERN) with tetrabrachion (TB) domain stalk Deposited 2018-03-16	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Insufficient information Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain C 83–470（388 aa） Chain D 83–470（388 aa） Chain F 83–470（388 aa） Chain G 83–470（388 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 3	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 7；293 K；100 mM HEPES buffer at pH7.0 with 10% PEG6000	Resolution 2.57 Å R-free 0.306
6D3B INFLUENZA VIRUS NEURAMINIDASE SUBTYPE N9 (TERN) APO FORM Deposited 2018-04-15	Different construct Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 82–470（389 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 CA CALCIUM ION × 8 GOL GLYCEROL × 16	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；298 K；1.4 M KH2PO4 + 3.0 M K2HPO4 (2:1)	Resolution 1.40 Å R-free 0.170
6HCX Influenza Virus N9 Neuraminidase A complex with Zanamivir molecule (Tern). Deposited 2018-08-16	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa）	Not recorded	CA CALCIUM ION × 8 GOL GLYCEROL × 12 ZMR ZANAMIVIR × 4 K POTASSIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.6；293 K；N9 crystals were grown by hanging-drop vapour diffusion against a reservoir of 1.9M potassium phosphate, pH 6.8, starting with equal volumes of N9 NA (10-15 mg/ml in water) and potassium phosphate buffer 1.4M KH2PO4:3M K2HPO4 in ratio 8:4, pH 6.6 at 20 degrees celsius. Inhibitor complexes obtained by soaking N9 crystals in a solution of 1.4M potassium phosphate buffer, pH 6.8, containing 5mM of inhibitor for 3 hours at 18 degrees celsius. Soaked in glycerol cryo-buffer.	Resolution 1.30 Å R-free 0.125
6HEB Influenza A Virus N9 Neuraminidase complex with Oseltamivir (Tern). Deposited 2018-08-20	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa）	Not recorded	CA CALCIUM ION × 8 GOL GLYCEROL × 24 G39 (3R,4R,5S)-4-(acetylamino)-5-amino-3-(pentan-3-yloxy)cyclohex-1-ene-1-carboxylic acid × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.6；293 K；N9 crystals were grown by hanging drop vapour diffusion against a reservoir of 1.9M potassium phosphate, pH 6.8, starting with equal volumes of N9 NA(10-15mg/ml in water) and potassium phosphate buffer 1.4M KH2PO4:3M K2HPO4 in ratio 8:4, pH 6.6 at 20 degrees celsius. Inhibitor complexeswere obtained by soaking N9 crystals in a solution of 1.4M potassium phosphate buffer, pH 6.8, containing 5 mM of inhibitor for 3 hours at 18 degrees celsius. Glycerol cryo-buffer also soaked in.	Resolution 1.75 Å R-free 0.142
6HFC Influenza A Virus N9 Neuraminidase Native (Tern). Deposited 2018-08-21	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa）	Not recorded	CA CALCIUM ION × 8 GOL GLYCEROL × 28 K POTASSIUM ION × 8 CO2 CARBON DIOXIDE × 4 PO4 PHOSPHATE ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.6；293 K；N9 crystals were grown by-hanging drop vapour diffusion against a reservoir of 1.9M potassium phosphate, pH 6.8, starting with equal volumes of N9 NA solution (10 to 15 mg/ml in water) and potassium phosphate buffer 1.4M KH2PO4: 3M K2HPO4 in ratio 8:4, pH 6.6 at 20 degrees celsius. Large rhombic dodecahedral crystals grew within a few days.	Resolution 1.29 Å R-free 0.164
6HG0 Influenza A Virus N9 Neuraminidase complex with NANA (Tern/Australia). Deposited 2018-08-22	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa）	Not recorded	CA CALCIUM ION × 8 GOL GLYCEROL × 16 PO4 PHOSPHATE ION × 4 SIA N-acetyl-alpha-neuraminic acid × 8 K POTASSIUM ION × 4	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 6.6；293 K；N9 crystals were grown by hanging-drop vapour diffusion against a reservoir of 1.9M potassium phosphate, pH 6.8, starting with equal volumes of N9 NA (10-15 mg/ml in water) and potassium phosphate buffer 1.4M KH2PO4:3M K2HPO4 in ratio 8:4, pH 6.6 at 20 degrees celsius. Inhibitor complexes obtained by soaking N9 crystals in a solution of 1.4M potassium phosphate buffer, pH 6.8, containing 5mM of inhibitor for 3 hours at 4 degrees celsius. Soaked in glycerol cryo-buffer.	Resolution 1.30 Å R-free 0.120
6MCX INFLUENZA VIRUS NEURAMINIDASE SUBTYPE N9 (TERN) RECOMBINANT HEAD DOMAIN Deposited 2018-09-02	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CA CALCIUM ION × 4 GOL GLYCEROL × 12	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7；298 K；1.4 M KH2PO4 + 3.0 M K2HPO4 (2:1), PH 7.0, VAPOR DIFFUSION, HANGING DROP,	Resolution 2.30 Å R-free 0.206
6NN9 REFINED ATOMIC STRUCTURES OF N9 SUBTYPE INFLUENZA VIRUS NEURAMINIDASE AND ESCAPE MUTANTS Deposited 1991-03-28	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CA CALCIUM ION × 4	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.30 Å
7NN9 NATIVE INFLUENZA VIRUS NEURAMINIDASE SUBTYPE N9 (TERN) Deposited 1995-03-15	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 4 PDB declaration: tetrameric	Chain A 83–470（388 aa）	Not recorded	NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 CA CALCIUM ION × 4	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 2.00 Å

47 other PDB entries and 52 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	NRAM_IATRA
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–388； UniProt 83–470

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

SAXS scattering curve SAXS Profile

P(r) Distance Distribution P(r) Distribution

Download Download SAXS (.dat) P(r) (.pr.out) CIF

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2. Structure Basics 2. Structure Basics

Entry ID entry_id	2c4a
Deposition date deposition_date	2005-10-17
Structure title title	Structure of Neuraminidase Subtype N9 Complexed with 30 MM Sialic Acid (NANA, NEU5AC), Crystal Soaked for 3 Hours at 291 K.
Keywords keywords	HYDROLASE, INFLUENZA TYPE A, NEURAMINIDASE, SIALIC ACID, SUBTYPE N9, GLYCOPROTEIN, GLYCOSIDASE, TRANSMEMBRANE; HYDROLASE
Experimental Method method	X-RAY DIFFRACTION

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3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier	21.49 Å
Radius of gyration Rg (electron density) rg_electron	20.68 Å
Forward intensity I(0) i0	39432800.00
Molecular weight molecular_weight	46496.0 kDa
Excluded volume excluded_volume	57166 Å³
Envelope volume envelope_volume	66271 Å³
Hydration-shell volume shell_volume	25703 Å³
Envelope diameter envelope_diameter	79.5 Å
Shell Rg shell_rg	28.35 Å
Envelope Rg envelope_rg	21.77 Å
Shape Rg shape_rg	20.65 Å
Total Rg total_rg	21.65 Å
Total atoms total_atoms	3257
Residues n_residues	385
Spherical-harmonic order n_harmonics	20
q range q_range	— – 0.5000 Å⁻¹
Data points n_points	101
Shell type shell_type	directional
Solvent electron density solvent_density	0.3340 e/Å³
Shell contrast contrast_shell	0.0300 e/Å³
CRYSOL version crysol_version	4.1.3

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4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax	78.2 Å
Rg (real space) rg_real	21.42 Å
Rg uncertainty (real space) rg_real_error	0.48 Å
I(0) (real space) i0_real	3.9430e+07
I(0) uncertainty (real space) i0_real_error	5.1870e+05
Rg (reciprocal space) rg_reciprocal	21.43 Å
I(0) (reciprocal space) i0_reciprocal	39430000.0000
Solution quality estimate total_estimate	0.8251
Solution quality rating solution_quality	GOOD a GOOD solution
P(r) peaks n_peaks	2
Primary peak position r_peak_primary	27.6 Å
Skewness Skewness skewness	0.359
Kurtosis Kurtosis kurtosis	0.080
Angular range angular_range	— – 0.3700 Å⁻¹
Current regularization parameter α current_alpha	0.0000
Highest regularization parameter α highest_alpha	15310000.0000
Real-space data points n_real_points	69
GNOM version gnom_version	4.1.3
Quality Criteria quality_criteria	AN1: 0.000; Oscil: 0.590; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.972; Smooth: 0.979

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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (7)

Entity 1 Entity 1 polymer

Description description	NEURAMINIDASE SUBTYPE N9
Molecular weight formula_weight	43723.8 kDa
EC 编号 ec_number	3.2.1.18
Source method src_method	man
Copy count entity_count	1

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	A
Atom count atom_count	3516

RDFNNLTKGLCTINSWHIYGKDNAVRIGEDSDVLVTREPYVSCDPDECRFYALSQGTTIRGKHSNGTIHDRSQYRALISWPLSSPPTVYNSRVECIGWSSTSCHDGKTRMSICISGPNNNASAVIWYNRRPVTEINTWARNILRTQESECVCHNGVCPVVFTDGSATGPAETRIYYFKEGKILKWEPLAGTAKHIEECSCYGERAEITCTCRDNWQGSNRPVIRIDPVAMTHTSQYICSPVLTDNPRPNDPTVGKCNDPYPGNNNNGVKGFSYLDGVNTWLGRTISIASRSGYEMLKVPNALTDDKSKPTQGQTIVLNTDWSGYSGSFMDYWAEGECYRACFYVELIRGRPKEDKVWWTSNSIVSMCSSTEFLGQWDWPDGAKIEYFL

来源 Source

来源生物 organism	INFLUENZA A VIRUS
通用名 common_name	AVIAN INFLUENZA VIRUS A
NCBI Class编号 ncbi_taxonomy_id	11320
宿主生物 host_organism	GALLUS GALLUS

Entity 2 Entity 2 branched

Description description	;alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose ;
Molecular weight formula_weight	1559.4 kDa
Source method src_method	man
Copy count entity_count	1

Entity 3 Entity 3 branched

Description description	2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
Molecular weight formula_weight	424.4 kDa
Source method src_method	man
Copy count entity_count	1

Entity 4 Entity 4 non-polymer

Description description	N-acetyl-alpha-neuraminic acid
Molecular weight formula_weight	309.3 kDa
Source method src_method	man
Copy count entity_count	2

Entity 5 Entity 5 non-polymer

Description description	2-acetamido-2-deoxy-beta-D-glucopyranose
Molecular weight formula_weight	221.2 kDa
Source method src_method	man
Copy count entity_count	1

Entity 6 Entity 6 non-polymer

Description description	CALCIUM ION
Molecular weight formula_weight	40.1 kDa
Source method src_method	syn
Copy count entity_count	1

Entity 7 Entity 7 water

Description description	water
Molecular weight formula_weight	18.0 kDa
Source method src_method	nat
Copy count entity_count	259

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7. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

Domain ID domain_id	d2c4aa_
Class class	b — All beta proteins
Fold Fold fold	b.68 — 6-bladed beta-propeller
Superfamily Superfamily superfamily	b.68.1 — Sialidases
Family Family family	b.68.1.1 — Sialidases (neuraminidases)

CATH v4.4 (1 domains)

Domain ID domain_id	2c4aA00
Class class	2 — Mainly Beta
Architecture architecture	120 — 6 Propeller
Topology topology	10 — Neuraminidase
Homologous superfamily homologous superfamily	10 —

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8. Citations (1)

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Unit-cell length a length_a	181.336 Å
Unit-cell length b length_b	181.336 Å
Unit-cell length c length_c	181.336 Å
Unit-cell angle α angle_alpha	90.00 °
Unit-cell angle β angle_beta	90.00 °
Unit-cell angle γ angle_gamma	90.00 °
Molecules per unit cell Z z_pdb	48

Space group space_group	I 4 3 2
Space-group number int_tables_number	211
Crystal system crystal_system	—

Resolution resolution	2.150 Å
Low-resolution limit resolution_low	30.100 Å
R factor r_factor	0.1600
R_work r_work	0.1580
R_free r_free	0.2050

fit	/app/data/saxs_computation/c4/2c4a/2c4a.fit
pddf	/app/data/pr_computation/c4/2c4a/2c4a.pr.out
profile	/app/data/saxs_computation/c4/2c4a/2c4a.dat