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1b3u

CRYSTAL STRUCTURE OF CONSTANT REGULATORY DOMAIN OF HUMAN PP2A, PR65ALPHA

Method: X-RAY DIFFRACTION Dmax: 142.8 Å Quality: GOOD
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1. Protein Identity and Related Structures Protein Identity & Related Structures

PROTEIN (PROTEIN PHOSPHATASE PP2A)

Homo sapiens

UniProt P30153

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 monomer Monomer Protein × 1 PDB declaration: monomeric（1） Consistent with protein copy count Chain A； UniProt 1–588 Fragment：65 KD REGULATORY SUBUNIT No other associated polymer X-RAY DIFFRACTION X-ray crystallization conditions：pH 5.5；pH 5.5 Resolution 2.30 Å R-free 0.268
2 Protein monomer Monomer Protein × 1 PDB declaration: monomeric（1） Consistent with protein copy count Chain not uniquely mapped； UniProt —–— Fragment：65 KD REGULATORY SUBUNIT No other associated polymer X-RAY DIFFRACTION X-ray crystallization conditions：pH 5.5；pH 5.5 Resolution 2.30 Å R-free 0.268

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 1B3U Assembly / Oligomeric State Construct Mutations and Modifications Ligands, Ions and Non-polymers Method and Experimental Conditions Structure Quality
2PKG Structure of a complex between the A subunit of protein phosphatase 2A and the small t antigen of SV40 Deposited 2007-04-17 Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric
Chain A 10–589（580 aa）
Not recorded ZN ZINC ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；290 K；0.2 M MgCl2, 4.5% PEG10000 (w/v), 0.1 M HEPES pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 290K
Resolution 3.30 Å R-free 0.312
2PKG Structure of a complex between the A subunit of protein phosphatase 2A and the small t antigen of SV40 Deposited 2007-04-17 Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric
Chain B 10–589（580 aa）
Not recorded ZN ZINC ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；290 K；0.2 M MgCl2, 4.5% PEG10000 (w/v), 0.1 M HEPES pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 290K
Resolution 3.30 Å R-free 0.312
3C5W Complex between PP2A-specific methylesterase PME-1 and PP2A core enzyme Deposited 2008-02-01 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 A 9–46（38 aa）
Chain A 400–589（190 aa）
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.5；290 K；25% w/v PEG3350, 100 mM ammonium citrate, and 5 mM DTT, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 290K
Resolution 2.80 Å R-free 0.263
3DW8 Structure of a Protein Phosphatase 2A Holoenzyme with B55 subunit Deposited 2008-07-21 Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 9–589（581 aa） Fragment：A delta 8: Residues 9-589
Not recorded MN MANGANESE (II) ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.5；290 K；7-10% PEG 35000, 0.10-0.15 M Sodium citrate pH 5.5, VAPOR DIFFUSION, HANGING DROP, temperature 290K
Resolution 2.85 Å R-free 0.285
3DW8 Structure of a Protein Phosphatase 2A Holoenzyme with B55 subunit Deposited 2008-07-21 Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain D 9–589（581 aa） Fragment：A delta 8: Residues 9-589
Not recorded MN MANGANESE (II) ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5.5；290 K；7-10% PEG 35000, 0.10-0.15 M Sodium citrate pH 5.5, VAPOR DIFFUSION, HANGING DROP, temperature 290K
Resolution 2.85 Å R-free 0.285
3K7V Protein phosphatase 2A core complex bound to dinophysistoxin-1 Deposited 2009-10-13 Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric
Chain A 1–589（589 aa）
Not recorded SO4 SULFATE ION × 3 XT1 (2R)-3-[(2S,5R,6R,8S)-8-{(1R,2E)-3-[(2R,4a'R,5R,6'S,8'R,8a'S)-6'-{(1S,3S)-3-[(2S,3R,6R,11R)-3,11-dimethyl-1,7-dioxaspiro[5.5]undec-2-yl]-1-hydroxybutyl}-8'-hydroxy-7'-methylideneoctahydro-3H,3'H-spiro[furan-2,2'-pyrano[3,2-b]pyran]-5-yl]-1-methylprop-2-en-1-yl}-5-hydroxy-10-methyl-1,7-dioxaspiro[5.5]undec-10-en-2-yl]-2-hydroxy-2-methylpropanoic acid × 1 MN MANGANESE (II) ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.5；293 K；0.2 M LITHIUM SULFATE, 1.5 M AMMONIUM SULFATE, 0.1 M TRIS-CL, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.85 Å R-free 0.262
3K7W Protein phosphatase 2A core complex bound to dinophysistoxin-2 Deposited 2009-10-13 Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric
Chain A 1–589（589 aa）
Not recorded SO4 SULFATE ION × 3 XT2 (2R)-2-hydroxy-3-[(2S,5R,6R,8S)-5-hydroxy-8-{(1R,2E)-3-[(2R,4a'R,5R,6'S,8'R,8a'S)-8'-hydroxy-6'-{(1S,3S)-1-hydroxy-3-[( 2S,6R,11S)-11-methyl-1,7-dioxaspiro[5.5]undec-2-yl]butyl}-7'-methylideneoctahydro-3H,3'H-spiro[furan-2,2'-pyrano[3,2-b]p yran]-5-yl]-1-methylprop-2-en-1-yl}-10-methyl-1,7-dioxaspiro[5.5]undec-10-en-2-yl]-2-methylpropanoic acid × 1 MN MANGANESE (II) ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.5；293 K；0.2 M LITHIUM SULFATE, 1.5 M AMMONIUM SULFATE, 0.1 M TRIS-CL, pH 8.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.96 Å R-free 0.263
4I5L Structural mechanism of trimeric PP2A holoenzyme involving PR70: insight for Cdc6 dephosphorylation Deposited 2012-11-28 Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Insufficient information Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 9–589（581 aa） Fragment：PP2A A alpha subunit (9-589)
Not recorded PEG DI(HYDROXYETHYL)ETHER × 8 CA CALCIUM ION × 2 MN MANGANESE (II) ION × 2 MLI MALONATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5；292 K；0.1M Na Malonate, 12% PEG 3350 + 6.2mg/mL protein in buffer Tris, 150mM NaCl , pH 5.0, VAPOR DIFFUSION, HANGING DROP, temperature 292K
Resolution 2.43 Å R-free 0.228
4I5L Structural mechanism of trimeric PP2A holoenzyme involving PR70: insight for Cdc6 dephosphorylation Deposited 2012-11-28 Different construct Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Insufficient information Heteromer；Protein × 4 PDB declaration: tetrameric
Chain D 9–589（581 aa） Fragment：PP2A A alpha subunit (9-589)
Not recorded PEG DI(HYDROXYETHYL)ETHER × 3 CA CALCIUM ION × 2 MN MANGANESE (II) ION × 2 MLI MALONATE ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 5；292 K；0.1M Na Malonate, 12% PEG 3350 + 6.2mg/mL protein in buffer Tris, 150mM NaCl , pH 5.0, VAPOR DIFFUSION, HANGING DROP, temperature 292K
Resolution 2.43 Å R-free 0.228
4I5N Structural mechanism of trimeric PP2A holoenzyme involving PR70: insight for Cdc6 dephosphorylation Deposited 2012-11-28 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Insufficient information Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 9–589（581 aa） Fragment：PP2A A alpha subunit (9-589)
Non-standard monomer：Yes (specific site not provided by mmCIF) CA CALCIUM ION × 2 MN MANGANESE (II) ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 4.75；296 K；0.03M Succinic acid with 7% PEG 3350. Protein (6.2mg/mL) in 10mM tris pH 8.0, 150mM NaCl, 5mM DTT, 1mM CaCl2, VAPOR DIFFUSION, HANGING DROP, temperature 296K
Resolution 2.80 Å R-free 0.250
4I5N Structural mechanism of trimeric PP2A holoenzyme involving PR70: insight for Cdc6 dephosphorylation Deposited 2012-11-28 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Insufficient information Heteromer；Protein × 4 PDB declaration: tetrameric
Chain D 9–589（581 aa） Fragment：PP2A A alpha subunit (9-589)
Non-standard monomer：Yes (specific site not provided by mmCIF) CA CALCIUM ION × 2 MN MANGANESE (II) ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 4.75；296 K；0.03M Succinic acid with 7% PEG 3350. Protein (6.2mg/mL) in 10mM tris pH 8.0, 150mM NaCl, 5mM DTT, 1mM CaCl2, VAPOR DIFFUSION, HANGING DROP, temperature 296K
Resolution 2.80 Å R-free 0.250
5W0W Crystal structure of Protein Phosphatase 2A bound to TIPRL Deposited 2017-06-01 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain A 9–589（581 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) MN MANGANESE (II) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.2；292 K；0.1M citric acid pH 5.2, 9% PEG4000, 0.2M sodium acetate
Resolution 3.80 Å R-free 0.246
5W0W Crystal structure of Protein Phosphatase 2A bound to TIPRL Deposited 2017-06-01 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain D 9–589（581 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) MN MANGANESE (II) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.2；292 K；0.1M citric acid pH 5.2, 9% PEG4000, 0.2M sodium acetate
Resolution 3.80 Å R-free 0.246
5W0W Crystal structure of Protein Phosphatase 2A bound to TIPRL Deposited 2017-06-01 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 3 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain G 9–589（581 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) MN MANGANESE (II) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.2；292 K；0.1M citric acid pH 5.2, 9% PEG4000, 0.2M sodium acetate
Resolution 3.80 Å R-free 0.246
5W0W Crystal structure of Protein Phosphatase 2A bound to TIPRL Deposited 2017-06-01 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 4 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain J 9–589（581 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) MN MANGANESE (II) ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.2；292 K；0.1M citric acid pH 5.2, 9% PEG4000, 0.2M sodium acetate
Resolution 3.80 Å R-free 0.246
6IUR A phosphatase complex STRN3-PP2Aa Deposited 2018-11-30 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 8–589（582 aa） Fragment：UNP residues 8-589
Chain B 8–589（582 aa） Fragment：UNP residues 8-589
Not recorded TME PROPANE × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；289 K；0.1M BIS-TRIS propane pH 9.0, 8.5% PEG20000
Resolution 3.33 Å R-free 0.249
6IUR A phosphatase complex STRN3-PP2Aa Deposited 2018-11-30 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain E 8–589（582 aa） Fragment：UNP residues 8-589
Chain F 8–589（582 aa） Fragment：UNP residues 8-589
Not recorded TME PROPANE × 4 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；289 K；0.1M BIS-TRIS propane pH 9.0, 8.5% PEG20000
Resolution 3.33 Å R-free 0.249
6NTS Protein Phosphatase 2A (Aalpha-B56alpha-Calpha) holoenzyme in complex with a Small Molecule Activator of PP2A (SMAP) Deposited 2019-01-30 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain A 1–589（589 aa）
Not recorded L2J N-[(1R,2R,3S)-2-hydroxy-3-(10H-phenoxazin-10-yl)cyclohexyl]-4-(trifluoromethoxy)benzene-1-sulfonamide × 1 MN MANGANESE (II) ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.02
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.63 Å
7CUN The structure of human Integrator-PP2A complex Deposited 2020-08-23 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 12 PDB declaration: dodecameric
Chain P 1–589（589 aa）
Non-standard monomer：Yes (specific site not provided by mmCIF) ZN ZINC ION × 2 MN MANGANESE (II) ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.50 Å
7K36 Cryo-EM structure of STRIPAK complex Deposited 2020-09-10 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 9 PDB declaration: nonameric
Chain A 1–589（589 aa）
Not recorded MN MANGANESE (II) ION × 2 ZN ZINC ION × 2 IHP INOSITOL HEXAKISPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.30 Å
7PKS Structural basis of Integrator-mediated transcription regulation Deposited 2021-08-26 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 30 PDB declaration: 31-meric
Chain p 1–589（589 aa）
Not recorded MG MAGNESIUM ION × 1 ZN ZINC ION × 10 MN MANGANESE (II) ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.60 Å
7SOY The structure of the PP2A-B56gamma1 holoenzyme-PME-1 complex Deposited 2021-11-01 Different construct Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 1–589（589 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.40 Å
7YCX The structure of INTAC-PEC complex Deposited 2022-07-02 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 31 PDB declaration: 34-meric
Chain P 1–589（589 aa）
Not recorded ZN ZINC ION × 10 MN MANGANESE (II) ION × 2 MG MAGNESIUM ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.18 Å
8RBX Structure of Integrator-PP2A bound to a paused RNA polymerase II-DSIF-NELF-nucleosome complex Deposited 2023-12-05 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 43 PDB declaration: 46-meric
Chain p 1–589（589 aa）
Not recorded ZN ZINC ION × 10 MG MAGNESIUM ION × 1 MN MANGANESE (II) ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.10 Å
8RBZ Structure of Integrator-PP2A-SOSS-CTD post-termination complex Deposited 2023-12-05 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 21 PDB declaration: 21-meric
Chain p 1–589（589 aa）
Not recorded ZN ZINC ION × 2 MN MANGANESE (II) ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.70 Å
8RC4 Structure of Integrator-PP2A complex Deposited 2023-12-06 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 16 PDB declaration: 16-meric
Chain p 1–589（589 aa）
Not recorded MN MANGANESE (II) ION × 2 ZN ZINC ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.10 Å
8SO0 Cryo-EM structure of the PP2A:B55-FAM122A complex Deposited 2023-04-28 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 9–589（581 aa）
Not recorded FE FE (III) ION × 1 ZN ZINC ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；CHAPSO was added only immediately prior to vitrification
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.80 Å
8TTB Cryo-EM structure of the PP2A:B55-ARPP19 complex Deposited 2023-08-13 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 9–589（581 aa）
Not recorded FE FE (III) ION × 1 ZN ZINC ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；CHAPSO was added only immediately prior to vitrification
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.77 Å
8TWE Cryo-EM structure of the PP2A:B55-FAM122A complex, B55 body Deposited 2023-08-21 Different construct Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 9–589（581 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8；CHAPSO was added only immediately prior to vitrification
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.55 Å
8TWI Cryo-EM structure of the PP2A:B55-FAM122A complex, PP2Ac body Deposited 2023-08-21 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain A 9–589（581 aa）
Not recorded FE FE (III) ION × 1 ZN ZINC ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8；CHAPSO was added only immediately prior to vitrification
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.69 Å
8U1X The structure of the PP2A-B56Delta holoenzyme mutant - E197K Deposited 2023-09-04 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain A 1–589（589 aa）
Not recorded MN MANGANESE (II) ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.70 Å
8U89 The structure of the PP2A-B56Delta holoenzyme mutant - E197K Deposited 2023-09-16 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain A 1–589（589 aa）
Not recorded MN MANGANESE (II) ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.30 Å
8UO5 Protein Phosphatase 2A B55 subunit in complex with IER5 Deposited 2023-10-19 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 1–589（589 aa）
Not recorded FE FE (III) ION × 1 ZN ZINC ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.6
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.27 Å
8UWB Crystal structure of PP2A PPP2R1A-PPP2CA-PPP2R5E phosphatase. Deposited 2023-11-06 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain A 1–589（589 aa）
Chain D 1–589（589 aa）
Not recorded MN MANGANESE (II) ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.77；297 K；23% (w/v) PEG 20k, 0.1 M BIS-TRIS pH 5.77
Resolution 3.15 Å R-free 0.263
8UWB Crystal structure of PP2A PPP2R1A-PPP2CA-PPP2R5E phosphatase. Deposited 2023-11-06 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain A 1–589（589 aa）
Chain D 1–589（589 aa）
Not recorded MN MANGANESE (II) ION × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 5.77；297 K；23% (w/v) PEG 20k, 0.1 M BIS-TRIS pH 5.77
Resolution 3.15 Å R-free 0.263
8YJB Cryo-EM structure of the human DSS1-INTAC complex Deposited 2024-03-01 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 12 PDB declaration: dodecameric
Chain P 1–589（589 aa）
Not recorded ZN ZINC ION × 2 MN MANGANESE (II) ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.10 Å
9C6B PP2A:B55-p107 substrate complex Deposited 2024-06-07 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 9–589（581 aa） Fragment：residues 9-589
Not recorded FE2 FE (II) ION × 1 ZN ZINC ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.60 Å
9C7T PP2A:B55-Eya3 substrate complex Deposited 2024-06-11 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 9–589（581 aa） Fragment：residues 9-589
Not recorded FE2 FE (II) ION × 1 ZN ZINC ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.70 Å
9MIP CryoEM structure of the Protein Phasphatase 2A (Aalpha-B56gamma-Calpha) holoenzyme complex Deposited 2024-12-13 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain A 1–589（589 aa）
Not recorded MN MANGANESE (II) ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.40 Å
9MZW PP2A-B55 holoenzyme Deposited 2025-01-23 Different construct Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain A 9–589（581 aa） Fragment：residues 9-589
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.16 Å
9N0Y PP2A-B55 Holoenzyme with Eya3 Deposited 2025-01-24 Different construct Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 9–589（581 aa） Fragment：residues 9-589
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.71 Å
9N0Z PP2A-B55 Holoenzyme with B55i Deposited 2025-01-24 Different construct Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 9–589（581 aa） Fragment：residues 9-589
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.50 Å
9VD9 Cryo-EM structure of the human DSS1-INTAC-PEC complex Deposited 2025-06-07 Different construct Different oligomeric state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Insufficient information Heteromer；Protein × 35 PDB declaration: 38-meric
Chain P 1–589（589 aa）
Not recorded ZN ZINC ION × 10 MN MANGANESE (II) ION × 2 MG MAGNESIUM ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.60 Å

34 other PDB entries and 43 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name 2AAA_HUMAN
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A； PDBConstruct 1–588； UniProt 1–588

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

SAXS profile for 1b3u

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 1b3u
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2. Structure Basics 2. Structure Basics

Entry ID entry_id1b3u
Deposition date deposition_date1998-12-14
Structure title titleCRYSTAL STRUCTURE OF CONSTANT REGULATORY DOMAIN OF HUMAN PP2A, PR65ALPHA
Keywords keywordsSCAFFOLD PROTEIN, PP2A, PHOSPHORYLATION, HEAT REPEAT; SCAFFOLD PROTEIN
Experimental Method methodX-RAY DIFFRACTION
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3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier43.63 Å
Radius of gyration Rg (electron density) rg_electron43.32 Å
Forward intensity I(0) i0244416000.00
Molecular weight molecular_weight130310.0 kDa
Excluded volume excluded_volume164410 ų
Envelope volume envelope_volume243640 ų
Hydration-shell volume shell_volume48434 ų
Envelope diameter envelope_diameter141.3 Å
Shell Rg shell_rg47.66 Å
Envelope Rg envelope_rg41.52 Å
Shape Rg shape_rg43.33 Å
Total Rg total_rg43.51 Å
Total atoms total_atoms9140
Residues n_residues1176
Spherical-harmonic order n_harmonics20
q range q_range— – 0.5000 Å−1
Data points n_points101
Shell type shell_typedirectional
Solvent electron density solvent_density0.3340 e/ų
Shell contrast contrast_shell0.0300 e/ų
CRYSOL version crysol_version4.1.3
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4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax142.8 Å
Rg (real space) rg_real43.65 Å
Rg uncertainty (real space) rg_real_error1.34 Å
I(0) (real space) i0_real2.4440e+08
I(0) uncertainty (real space) i0_real_error4.5320e+06
Rg (reciprocal space) rg_reciprocal43.63 Å
I(0) (reciprocal space) i0_reciprocal244400000.0000
Solution quality estimate total_estimate0.8871
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks1
Primary peak position r_peak_primary51.6 Å
Skewness Skewness skewness0.218
Kurtosis Kurtosis kurtosis-0.602
Angular range angular_range— – 0.1800 Å−1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha10460000.0000
Real-space data points n_real_points37
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.944; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.969; Smooth: 0.727
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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (2)

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7. Fold Classification (SCOP + CATH) 4 domains

SCOP 2.08 (2 domains)

Domain ID domain_idd1b3ua_
Class classa — All alpha proteins
Fold Fold folda.118 — alpha-alpha superhelix
Superfamily Superfamily superfamilya.118.1 — ARM repeat
Family Family familya.118.1.2 — HEAT repeat
Domain ID domain_idd1b3ub_
Class classa — All alpha proteins
Fold Fold folda.118 — alpha-alpha superhelix
Superfamily Superfamily superfamilya.118.1 — ARM repeat
Family Family familya.118.1.2 — HEAT repeat

CATH v4.4 (2 domains)

Domain ID domain_id1b3uA00
Class class1 — Mainly Alpha
Architecture architecture25 — Alpha Horseshoe
Topology topology10 — Leucine-rich Repeat Variant
Homologous superfamily homologous superfamily10 — Leucine-rich Repeat Variant
Domain ID domain_id1b3uB00
Class class1 — Mainly Alpha
Architecture architecture25 — Alpha Horseshoe
Topology topology10 — Leucine-rich Repeat Variant
Homologous superfamily homologous superfamily10 — Leucine-rich Repeat Variant
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8. Citations (1)

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9. Files and Curves (10)