9kms

CRP antigen-antibody2 complex

Method: ELECTRON MICROSCOPY D_max: 104.8 Å Quality: EXCELLENT

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

C-reactive protein

Homo sapiens

State in the Current Structure

Assembly	Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Associated Components	Method and Experimental Conditions	Structure Quality
1	Protein heterocomplex Heteromer Protein × 10 PDB declaration: decameric（10） Consistent with protein copy count	Chain A； UniProt 19–224 Chain C； UniProt 19–224 Chain E； UniProt 19–224 Chain G； UniProt 19–224 Chain I； UniProt 19–224	Not recorded	CRP antibody2 × 5	ELECTRON MICROSCOPY cryo-EM buffer：pH 8；20mM Tris-HCl cryo-EM vitrification conditions：Cryogen ETHANE	Resolution 4.20 Å

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 9KMS	Assembly / Oligomeric State	Construct	Mutations and Modifications	Ligands, Ions and Non-polymers	Method and Experimental Conditions	Structure Quality
1B09 HUMAN C-REACTIVE PROTEIN COMPLEXED WITH PHOSPHOCHOLINE Deposited 1998-11-18	Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain A 19–224（206 aa） Chain B 19–224（206 aa） Chain C 19–224（206 aa） Chain D 19–224（206 aa） Chain E 19–224（206 aa）	Not recorded	CA CALCIUM ION × 10 PC PHOSPHOCHOLINE × 5	X-RAY DIFFRACTION X-ray crystallization conditions pH 7.6；pH 7.6	Resolution 2.50 Å R-free 0.242
1GNH HUMAN C-REACTIVE PROTEIN Deposited 1996-03-01	Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain A 19–224（206 aa） Chain B 19–224（206 aa） Chain C 19–224（206 aa） Chain D 19–224（206 aa） Chain E 19–224（206 aa）	Not recorded	CA CALCIUM ION × 8	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 3.00 Å R-free 0.273
1GNH HUMAN C-REACTIVE PROTEIN Deposited 1996-03-01	Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain F 19–224（206 aa） Chain G 19–224（206 aa） Chain H 19–224（206 aa） Chain I 19–224（206 aa） Chain J 19–224（206 aa）	Not recorded	CA CALCIUM ION × 8	X-RAY DIFFRACTION mmCIF provides none of the parsed conditions	Resolution 3.00 Å R-free 0.273
1LJ7 Crystal structure of calcium-depleted human C-reactive protein from perfectly twinned data Deposited 2002-04-19	Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain A 19–224（206 aa） Chain B 19–224（206 aa） Chain C 19–224（206 aa） Chain D 19–224（206 aa） Chain E 19–224（206 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；VAPOR DIFFUSION, HANGING DROP	Resolution 3.15 Å R-free 0.199
1LJ7 Crystal structure of calcium-depleted human C-reactive protein from perfectly twinned data Deposited 2002-04-19	Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain F 19–224（206 aa） Chain G 19–224（206 aa） Chain H 19–224（206 aa） Chain I 19–224（206 aa） Chain J 19–224（206 aa）	Not recorded	No recorded non-water small molecule	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；VAPOR DIFFUSION, HANGING DROP	Resolution 3.15 Å R-free 0.199
3L2Y The structure of C-reactive protein bound to phosphoethanolamine Deposited 2009-12-15	Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain A 19–224（206 aa） Chain B 19–224（206 aa） Chain C 19–224（206 aa） Chain D 19–224（206 aa） Chain E 19–224（206 aa）	Not recorded	CA CALCIUM ION × 10 OPE PHOSPHORIC ACID MONO-(2-AMINO-ETHYL) ESTER × 5	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；285.15 K；0.06M TRIS-HCL pH7.5, 10% MPD, 0.01M CaCl2, 0.14M NaCl, 0.1% NaN3, 0.1% LM AGAROSE, VAPOR DIFFUSION, HANGING DROP, temperature 285.15K	Resolution 2.70 Å R-free 0.246
3L2Y The structure of C-reactive protein bound to phosphoethanolamine Deposited 2009-12-15	Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain F 19–224（206 aa） Chain G 19–224（206 aa） Chain H 19–224（206 aa） Chain I 19–224（206 aa） Chain J 19–224（206 aa）	Not recorded	CA CALCIUM ION × 10 OPE PHOSPHORIC ACID MONO-(2-AMINO-ETHYL) ESTER × 5	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；285.15 K；0.06M TRIS-HCL pH7.5, 10% MPD, 0.01M CaCl2, 0.14M NaCl, 0.1% NaN3, 0.1% LM AGAROSE, VAPOR DIFFUSION, HANGING DROP, temperature 285.15K	Resolution 2.70 Å R-free 0.246
3L2Y The structure of C-reactive protein bound to phosphoethanolamine Deposited 2009-12-15	Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 3 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain K 19–224（206 aa） Chain L 19–224（206 aa） Chain M 19–224（206 aa） Chain N 19–224（206 aa） Chain O 19–224（206 aa）	Not recorded	CA CALCIUM ION × 10 OPE PHOSPHORIC ACID MONO-(2-AMINO-ETHYL) ESTER × 5	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；285.15 K；0.06M TRIS-HCL pH7.5, 10% MPD, 0.01M CaCl2, 0.14M NaCl, 0.1% NaN3, 0.1% LM AGAROSE, VAPOR DIFFUSION, HANGING DROP, temperature 285.15K	Resolution 2.70 Å R-free 0.246
3L2Y The structure of C-reactive protein bound to phosphoethanolamine Deposited 2009-12-15	Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 4 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain P 19–224（206 aa） Chain Q 19–224（206 aa） Chain R 19–224（206 aa） Chain S 19–224（206 aa） Chain T 19–224（206 aa）	Not recorded	CA CALCIUM ION × 10 OPE PHOSPHORIC ACID MONO-(2-AMINO-ETHYL) ESTER × 5	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；285.15 K；0.06M TRIS-HCL pH7.5, 10% MPD, 0.01M CaCl2, 0.14M NaCl, 0.1% NaN3, 0.1% LM AGAROSE, VAPOR DIFFUSION, HANGING DROP, temperature 285.15K	Resolution 2.70 Å R-free 0.246
3PVN Triclinic form of Human C-Reactive Protein in complex with Zinc Deposited 2010-12-07	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain A 19–224（206 aa） Fragment：UNP residues 19-224 Chain B 19–224（206 aa） Fragment：UNP residues 19-224 Chain C 19–224（206 aa） Fragment：UNP residues 19-224 Chain D 19–224（206 aa） Fragment：UNP residues 19-224 Chain E 19–224（206 aa） Fragment：UNP residues 19-224	Not recorded	CA CALCIUM ION × 10 ZN ZINC ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 8；289 K；12% PEG 4000, 0.1M Tris-Hcl, 0.2M MgCl2, 0.05M LiCl, pH 8.0, VAPOR DIFFUSION, temperature 289K	Resolution 1.98 Å R-free 0.236
3PVN Triclinic form of Human C-Reactive Protein in complex with Zinc Deposited 2010-12-07	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain F 19–224（206 aa） Fragment：UNP residues 19-224 Chain G 19–224（206 aa） Fragment：UNP residues 19-224 Chain H 19–224（206 aa） Fragment：UNP residues 19-224 Chain I 19–224（206 aa） Fragment：UNP residues 19-224 Chain J 19–224（206 aa） Fragment：UNP residues 19-224	Not recorded	CA CALCIUM ION × 10 ZN ZINC ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 8；289 K；12% PEG 4000, 0.1M Tris-Hcl, 0.2M MgCl2, 0.05M LiCl, pH 8.0, VAPOR DIFFUSION, temperature 289K	Resolution 1.98 Å R-free 0.236
3PVN Triclinic form of Human C-Reactive Protein in complex with Zinc Deposited 2010-12-07	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 3 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain K 19–224（206 aa） Fragment：UNP residues 19-224 Chain L 19–224（206 aa） Fragment：UNP residues 19-224 Chain M 19–224（206 aa） Fragment：UNP residues 19-224 Chain N 19–224（206 aa） Fragment：UNP residues 19-224 Chain O 19–224（206 aa） Fragment：UNP residues 19-224	Not recorded	CA CALCIUM ION × 10 ZN ZINC ION × 1	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 8；289 K；12% PEG 4000, 0.1M Tris-Hcl, 0.2M MgCl2, 0.05M LiCl, pH 8.0, VAPOR DIFFUSION, temperature 289K	Resolution 1.98 Å R-free 0.236
3PVN Triclinic form of Human C-Reactive Protein in complex with Zinc Deposited 2010-12-07	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 4 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain P 19–224（206 aa） Fragment：UNP residues 19-224 Chain Q 19–224（206 aa） Fragment：UNP residues 19-224 Chain R 19–224（206 aa） Fragment：UNP residues 19-224 Chain S 19–224（206 aa） Fragment：UNP residues 19-224 Chain T 19–224（206 aa） Fragment：UNP residues 19-224	Not recorded	CA CALCIUM ION × 10 ZN ZINC ION × 2	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 8；289 K；12% PEG 4000, 0.1M Tris-Hcl, 0.2M MgCl2, 0.05M LiCl, pH 8.0, VAPOR DIFFUSION, temperature 289K	Resolution 1.98 Å R-free 0.236
3PVO Monoclinic form of Human C-Reactive Protein Deposited 2010-12-07	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain A 19–224（206 aa） Fragment：UNP residues 19-224 Chain B 19–224（206 aa） Fragment：UNP residues 19-224 Chain C 19–224（206 aa） Fragment：UNP residues 19-224 Chain D 19–224（206 aa） Fragment：UNP residues 19-224 Chain E 19–224（206 aa） Fragment：UNP residues 19-224	Not recorded	CA CALCIUM ION × 10	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 8；289 K；12% PEG 4000, 0.1M Tris-HCl, 0.2M MgCl2, 0.05M LiCl, pH 8.0, VAPOR DIFFUSION, temperature 289K	Resolution 3.00 Å R-free 0.285
3PVO Monoclinic form of Human C-Reactive Protein Deposited 2010-12-07	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain F 19–224（206 aa） Fragment：UNP residues 19-224 Chain G 19–224（206 aa） Fragment：UNP residues 19-224 Chain H 19–224（206 aa） Fragment：UNP residues 19-224 Chain I 19–224（206 aa） Fragment：UNP residues 19-224 Chain J 19–224（206 aa） Fragment：UNP residues 19-224	Not recorded	CA CALCIUM ION × 10	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 8；289 K；12% PEG 4000, 0.1M Tris-HCl, 0.2M MgCl2, 0.05M LiCl, pH 8.0, VAPOR DIFFUSION, temperature 289K	Resolution 3.00 Å R-free 0.285
3PVO Monoclinic form of Human C-Reactive Protein Deposited 2010-12-07	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 3 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain K 19–224（206 aa） Fragment：UNP residues 19-224 Chain L 19–224（206 aa） Fragment：UNP residues 19-224 Chain M 19–224（206 aa） Fragment：UNP residues 19-224 Chain N 19–224（206 aa） Fragment：UNP residues 19-224 Chain O 19–224（206 aa） Fragment：UNP residues 19-224	Not recorded	CA CALCIUM ION × 10	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 8；289 K；12% PEG 4000, 0.1M Tris-HCl, 0.2M MgCl2, 0.05M LiCl, pH 8.0, VAPOR DIFFUSION, temperature 289K	Resolution 3.00 Å R-free 0.285
3PVO Monoclinic form of Human C-Reactive Protein Deposited 2010-12-07	Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 4 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain P 19–224（206 aa） Fragment：UNP residues 19-224 Chain Q 19–224（206 aa） Fragment：UNP residues 19-224 Chain R 19–224（206 aa） Fragment：UNP residues 19-224 Chain S 19–224（206 aa） Fragment：UNP residues 19-224 Chain T 19–224（206 aa） Fragment：UNP residues 19-224	Not recorded	CA CALCIUM ION × 10	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION；pH 8；289 K；12% PEG 4000, 0.1M Tris-HCl, 0.2M MgCl2, 0.05M LiCl, pH 8.0, VAPOR DIFFUSION, temperature 289K	Resolution 3.00 Å R-free 0.285
7PK9 C-reactive protein decamer at pH 7.5 Deposited 2021-08-25	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 10 PDB declaration: decameric	Chain A 19–224（206 aa） Chain B 19–224（206 aa） Chain C 19–224（206 aa） Chain D 19–224（206 aa） Chain E 19–224（206 aa） Chain F 19–224（206 aa） Chain G 19–224（206 aa） Chain H 19–224（206 aa） Chain I 19–224（206 aa） Chain J 19–224（206 aa）	Not recorded	CA CALCIUM ION × 20	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.80 Å
7PKB C-reactive protein pentamer at pH 7.5 Deposited 2021-08-25	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain A 19–224（206 aa） Chain B 19–224（206 aa） Chain C 19–224（206 aa） Chain D 19–224（206 aa） Chain E 19–224（206 aa）	Not recorded	CA CALCIUM ION × 10	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.20 Å
7PKD C-reactive protein decamer at pH 7.5 with phosphocholine ligand Deposited 2021-08-25	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain F 19–224（206 aa） Chain G 19–224（206 aa） Chain H 19–224（206 aa） Chain I 19–224（206 aa） Chain J 19–224（206 aa）	Not recorded	CA CALCIUM ION × 10 PC PHOSPHOCHOLINE × 5	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.30 Å
7PKD C-reactive protein decamer at pH 7.5 with phosphocholine ligand Deposited 2021-08-25	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain A 19–224（206 aa） Chain B 19–224（206 aa） Chain C 19–224（206 aa） Chain D 19–224（206 aa） Chain E 19–224（206 aa）	Not recorded	CA CALCIUM ION × 10 PC PHOSPHOCHOLINE × 5	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.30 Å
7PKE C-reactive protein pentamer at pH 7.5 with phosphocholine ligand Deposited 2021-08-25	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain A 19–224（206 aa） Chain B 19–224（206 aa） Chain C 19–224（206 aa） Chain D 19–224（206 aa） Chain E 19–224（206 aa）	Not recorded	CA CALCIUM ION × 10 PC PHOSPHOCHOLINE × 5	ELECTRON MICROSCOPY cryo-EM buffer pH 7.5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.30 Å
7PKF C-reactive protein decamer at pH 5 Deposited 2021-08-25	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 10 PDB declaration: decameric	Chain A 19–224（206 aa） Chain B 19–224（206 aa） Chain C 19–224（206 aa） Chain D 19–224（206 aa） Chain E 19–224（206 aa） Chain F 19–224（206 aa） Chain G 19–224（206 aa） Chain H 19–224（206 aa） Chain I 19–224（206 aa） Chain J 19–224（206 aa）	Not recorded	CA CALCIUM ION × 20	ELECTRON MICROSCOPY cryo-EM buffer pH 5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.80 Å
7PKG C-reactive protein pentamer at pH 5 Deposited 2021-08-25	Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain A 19–224（206 aa） Chain B 19–224（206 aa） Chain C 19–224（206 aa） Chain D 19–224（206 aa） Chain E 19–224（206 aa）	Not recorded	CA CALCIUM ION × 10	ELECTRON MICROSCOPY cryo-EM buffer pH 5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.30 Å
7PKH C-reactive protein decamer at pH 5 with phosphocholine ligand Deposited 2021-08-25	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 10 PDB declaration: decameric	Chain A 19–224（206 aa） Chain B 19–224（206 aa） Chain C 19–224（206 aa） Chain D 19–224（206 aa） Chain E 19–224（206 aa） Chain F 19–224（206 aa） Chain G 19–224（206 aa） Chain H 19–224（206 aa） Chain I 19–224（206 aa） Chain J 19–224（206 aa）	Not recorded	CA CALCIUM ION × 20 PC PHOSPHOCHOLINE × 10	ELECTRON MICROSCOPY cryo-EM buffer pH 5 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.00 Å
7TBA Pentraxin - ligand complex Deposited 2021-12-21	Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain A 19–224（206 aa） Chain B 19–224（206 aa） Chain C 19–224（206 aa） Chain D 19–224（206 aa） Chain E 19–224（206 aa）	Not recorded	XQY [3-(dibutylamino)propyl]phosphonic acid × 5 CA CALCIUM ION × 10	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；295 K；100mM Tris pH 9.0, 10% PEG 4000, 50mM lithium chloride, 200mM magnesium chloride	Resolution 3.50 Å R-free 0.260
7TBA Pentraxin - ligand complex Deposited 2021-12-21	Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 2 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain F 19–224（206 aa） Chain G 19–224（206 aa） Chain H 19–224（206 aa） Chain I 19–224（206 aa） Chain J 19–224（206 aa）	Not recorded	XQY [3-(dibutylamino)propyl]phosphonic acid × 5 CA CALCIUM ION × 10	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；295 K；100mM Tris pH 9.0, 10% PEG 4000, 50mM lithium chloride, 200mM magnesium chloride	Resolution 3.50 Å R-free 0.260
7TBA Pentraxin - ligand complex Deposited 2021-12-21	Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 3 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain K 19–224（206 aa） Chain L 19–224（206 aa） Chain M 19–224（206 aa） Chain N 19–224（206 aa） Chain O 19–224（206 aa）	Not recorded	XQY [3-(dibutylamino)propyl]phosphonic acid × 5 CA CALCIUM ION × 10	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；295 K；100mM Tris pH 9.0, 10% PEG 4000, 50mM lithium chloride, 200mM magnesium chloride	Resolution 3.50 Å R-free 0.260
7TBA Pentraxin - ligand complex Deposited 2021-12-21	Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics	Assembly 4 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain P 19–224（206 aa） Chain Q 19–224（206 aa） Chain R 19–224（206 aa） Chain S 19–224（206 aa） Chain T 19–224（206 aa）	Not recorded	XQY [3-(dibutylamino)propyl]phosphonic acid × 5 CA CALCIUM ION × 10	X-RAY DIFFRACTION X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；295 K；100mM Tris pH 9.0, 10% PEG 4000, 50mM lithium chloride, 200mM magnesium chloride	Resolution 3.50 Å R-free 0.260
8WV4 C-reactive protein, pentamer Deposited 2023-10-23	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain A 1–224（224 aa） Chain B 1–224（224 aa） Chain C 1–224（224 aa） Chain D 1–224（224 aa） Chain E 1–224（224 aa）	Not recorded	CA CALCIUM ION × 10	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE；Blot force, 0	Resolution 3.30 Å
8WV5 C-reactive protein, decamer Deposited 2023-10-23	Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 10 PDB declaration: decameric	Chain A 1–224（224 aa） Chain B 1–224（224 aa） Chain C 1–224（224 aa） Chain D 1–224（224 aa） Chain E 1–224（224 aa） Chain F 1–224（224 aa） Chain G 1–224（224 aa） Chain H 1–224（224 aa） Chain I 1–224（224 aa） Chain J 1–224（224 aa）	Not recorded	CA CALCIUM ION × 20	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE；Blot force, 0	Resolution 3.50 Å
9JNY C recatived protein pentamer Deposited 2024-09-24	Different oligomeric state Different structure-quality metrics	Assembly 1 Protein homooligomer Homooligomer；Protein × 5 PDB declaration: pentameric	Chain A 19–224（206 aa） Chain B 19–224（206 aa） Chain C 19–224（206 aa） Chain D 19–224（206 aa） Chain E 19–224（206 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 8；20mM Tris-HCl cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.74 Å
9JO7 CRP-HCAb4 complex Deposited 2024-09-24	Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 10 PDB declaration: decameric	Chain A 19–224（206 aa） Chain B 19–224（206 aa） Chain D 19–224（206 aa） Chain F 19–224（206 aa） Chain H 19–224（206 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 8；20mM Tris-HCl cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.68 Å
9JO9 CRP-HCAb3 complex Deposited 2024-09-24	Different construct Different mutation/modification Different oligomeric state Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 20 PDB declaration: eicosameric	Chain B 19–224（206 aa） Chain D 19–224（206 aa） Chain F 19–224（206 aa） Chain H 19–224（206 aa） Chain J 19–224（206 aa） Chain L 19–224（206 aa） Chain N 19–224（206 aa） Chain Q 19–224（206 aa） Chain S 19–224（206 aa） Chain T 19–224（206 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 8；20mM Tris-HCl cryo-EM vitrification conditions Cryogen ETHANE	Resolution 3.65 Å
9K94 CRP-HCAb2 complex Deposited 2024-10-25	Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 10 PDB declaration: decameric	Chain A 19–224（206 aa） Chain C 19–224（206 aa） Chain D 19–224（206 aa） Chain F 19–224（206 aa） Chain I 19–224（206 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 8；20 mM Tris-HCL cryo-EM vitrification conditions Cryogen ETHANE	Resolution 4.04 Å
9KMP CRP-HCAb1 complex Deposited 2024-11-16	Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 10 PDB declaration: decameric	Chain A 19–224（206 aa） Chain C 19–224（206 aa） Chain E 19–224（206 aa） Chain G 19–224（206 aa） Chain H 19–224（206 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 8；20mM Tris-HCl cryo-EM vitrification conditions Cryogen ETHANE	Resolution 4.10 Å
9U4E Cryo-EM structure of the human CRP-CPS23F complex Deposited 2025-03-19	Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics	Assembly 1 Other combination Homooligomer；Protein × 5 PDB declaration: pentameric	Chain A 1–224（224 aa） Chain B 1–224（224 aa） Chain C 1–224（224 aa） Chain D 1–224（224 aa） Chain E 1–224（224 aa）	Not recorded	CA CALCIUM ION × 10	ELECTRON MICROSCOPY cryo-EM buffer pH 8 cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.78 Å
9VCA Binding site between C-reactive protein and c2cc monoclonal antibody Deposited 2025-06-05	Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics	Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric	Chain E 19–224（206 aa）	Not recorded	No recorded non-water small molecule	ELECTRON MICROSCOPY cryo-EM buffer pH 7.6；20 mM Tris-HCl buffer (pH 7.6), containing 150 mM NaCl cryo-EM vitrification conditions Cryogen ETHANE	Resolution 2.40 Å

23 other PDB entries and 38 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence

UniProt name	CRP_HUMAN
Isoform	—
PDB entities	1
Chains and sequence ranges	Author chain A； PDBConstruct 1–206； UniProt 19–224 Author chain C； PDBConstruct 1–206； UniProt 19–224 Author chain E； PDBConstruct 1–206； UniProt 19–224 Author chain G； PDBConstruct 1–206； UniProt 19–224 Author chain I； PDBConstruct 1–206； UniProt 19–224

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	9kms
Deposition date deposition_date	2024-11-17
Structure title title	CRP antigen-antibody2 complex
Keywords keywords	CRP, Antigen-Antibody complex, IMMUNE SYSTEM; IMMUNE SYSTEM
Experimental Method method	ELECTRON MICROSCOPY

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

Radius of gyration Rg (Guinier) rg_guinier	36.17 Å
Radius of gyration Rg (electron density) rg_electron	35.17 Å
Forward intensity I(0) i0	476645000.00
Molecular weight molecular_weight	180530.0 kDa
Excluded volume excluded_volume	226950 Å³
Envelope volume envelope_volume	273140 Å³
Hydration-shell volume shell_volume	61386 Å³
Envelope diameter envelope_diameter	105.6 Å
Shell Rg shell_rg	44.55 Å
Envelope Rg envelope_rg	34.09 Å
Shape Rg shape_rg	35.15 Å
Total Rg total_rg	35.87 Å
Total atoms total_atoms	20725
Residues n_residues	1625
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	104.8 Å
Rg (real space) rg_real	35.85 Å
Rg uncertainty (real space) rg_real_error	0.63 Å
I(0) (real space) i0_real	4.7660e+08
I(0) uncertainty (real space) i0_real_error	6.7130e+06
Rg (reciprocal space) rg_reciprocal	36.05 Å
I(0) (reciprocal space) i0_reciprocal	476700000.0000
Solution quality estimate total_estimate	0.9057
Solution quality rating solution_quality	EXCELLENT a EXCELLENT solution
P(r) peaks n_peaks	1
Primary peak position r_peak_primary	50.0 Å
Skewness Skewness skewness	-0.071
Kurtosis Kurtosis kurtosis	-0.660
Angular range angular_range	— – 0.2200 Å⁻¹
Current regularization parameter α current_alpha	0.0000
Highest regularization parameter α highest_alpha	92730000.0000
Real-space data points n_real_points	45
GNOM version gnom_version	4.1.3
Quality Criteria quality_criteria	AN1: 0.000; Oscil: 0.953; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.970; Smooth: 0.941

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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (2)

Entity 1 Entity 1 polymer

Description description	C-reactive protein
Molecular weight formula_weight	23068.0 kDa
Source method src_method	man
Copy count entity_count	5

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	C,A,E,G,I
Atom count atom_count	20725

QTDMSRKAFVFPKESDTSYVSLKAPLTKPLKAFTVCLHFYTELSSTRGYSIFSYATKRQDNEILIFWSKDIGYSFTVGGSEILFEVPEVTVAPVHICTSWESASGIVEFWVDGKPRVRKSLKKGYTVGAEASIILGQEQDSFGGNFEGSQSLVGDIGNVNMWDFVLSPDEINTIYLGGPFSPNVLNWRALKYEVQGEVFTKPQLWP

来源 Source

来源生物 organism	Homo sapiens
通用名 common_name	human
NCBI Class编号 ncbi_taxonomy_id	9606
宿主生物 host_organism	Homo sapiens

Entity 2 Entity 2 polymer

Description description	CRP antibody2
Molecular weight formula_weight	13380.0 kDa
Source method src_method	man
Copy count entity_count	5

Polymer Polymer

Polymer type type	polypeptide(L)
Chain IDs strand_id	D,B,F,H,J

MAHVQLVESGGGLVQAGGSLRLSCAASRDIFSRYTVGWYRQAPGKQRDLVALITNGGSTHYVDSVKGRFTISRDNAKNTVYLQMNSLKSEDTAIYYCNAFRASFDRTPLYSWGQGTLVTVSS

来源 Source

来源生物 organism	Vicugna pacos
NCBI Class编号 ncbi_taxonomy_id	30538
宿主生物 host_organism	Homo sapiens

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8. Citations (1)

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Unit-cell length a length_a	1.000 Å
Unit-cell length b length_b	1.000 Å
Unit-cell length c length_c	1.000 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	—

Space group space_group	P 1
Space-group number int_tables_number	1
Crystal system crystal_system	—

Resolution resolution	4.20 Å
Resolution测定方法 resolution_method	—
颗粒数 num_particles	202250

fit	/app/data/saxs_computation/km/9kms/9kms.fit
pddf	/app/data/pr_computation/km/9kms/9kms.pr.out
profile	/app/data/saxs_computation/km/9kms/9kms.dat

CRP antigen-antibody2 complex

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

C-reactive protein

State in the Current Structure

Other States of the Same Protein in the Database

SAXS scattering curve SAXS Profile

P(r) Distance Distribution P(r) Distribution

2. Structure Basics 2. Structure Basics

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

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

5. Crystallography and Experiment 5. Crystallography & Experiment

Unit cell Unit Cell

Symmetry Symmetry

冷冻电镜 EM 3D

6. Entities and Polymers Entities & Polymers (2)

Entity 1 Entity 1 polymer

Polymer Polymer

来源 Source

Entity 2 Entity 2 polymer

Polymer Polymer

来源 Source

8. Citations (1)

9. Files and Curves (10)

Files (7)

Curves (3)