1P32 | pdb_00001p32

CRYSTAL STRUCTURE OF HUMAN P32, A DOUGHNUT-SHAPED ACIDIC MITOCHONDRIAL MATRIX PROTEIN

• PDB DOI: https://doi.org/10.2210/pdb1P32/pdb

• Classification: MITOCHONDRIAL MATRIX PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 1998-11-02 Released: 1999-04-06 
• Deposition Author(s): Jiang, J., Zhang, Y., Krainer, A.R., Xu, R.-M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.25 Å
• R-Value Free: 
  0.234 (Depositor) 
• R-Value Work: 
  0.173 (Depositor) 

Literature

Crystal structure of human p32, a doughnut-shaped acidic mitochondrial matrix protein.

Jiang, J., Zhang, Y., Krainer, A.R., Xu, R.M.

(1999) Proc Natl Acad Sci U S A 96: 3572-3577

• PubMed: 10097078 
• DOI: https://doi.org/10.1073/pnas.96.7.3572
• Primary Citation Related Structures: 
  1P32


• PubMed Abstract: 
  

  Human p32 (also known as SF2-associated p32, p32/TAP, and gC1qR) is a conserved eukaryotic protein that localizes predominantly in the mitochondrial matrix. It is thought to be involved in mitochondrial oxidative phosphorylation and in nucleus-mitochondrion interactions. We report the crystal structure of p32 determined at 2.25 A resolution. The structure reveals that p32 adopts a novel fold with seven consecutive antiparallel beta-strands flanked by one N-terminal and two C-terminal alpha-helices. Three monomers form a doughnut-shaped quaternary structure with an unusually asymmetric charge distribution on the surface. The implications of the structure on previously proposed functions of p32 are discussed and new specific functional properties are suggested.

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Organizational Affiliation: 
• W. M. Keck Structural Biology Laboratory, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.

Biological Assembly 1  

Global Symmetry: Cyclic - C3  (Explore in 3D)
Global Stoichiometry: Homo 3-mer - A3 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 71.48 kDa 
• Atom Count: 4,663 
• Modeled Residue Count: 529 
• Deposited Residue Count: 627 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MITOCHONDRIAL MATRIX PROTEIN, SF2P32	A, B, C	209	Homo sapiens	Mutation(s): 1
UniProt & NIH Common Fund Data Resources
Find proteins for Q07021 (Homo sapiens) Explore Q07021  Go to UniProtKB:  Q07021
PHAROS:  Q07021 GTEx:  ENSG00000108561

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.25 Å
• R-Value Free:  0.234 (Depositor) 
• R-Value Work:  0.173 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 58.625	α = 90
b = 56.481	β = 95.99
c = 93.831	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	phasing
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1999-04-06 
Deposition Author(s): Jiang, J., Zhang, Y., Krainer, A.R., Xu, R.-M.

Revision History  

• Version 1.0: 1999-04-06
  Type: Initial release
  
• Version 1.1: 2008-04-26
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-03-14
  Changes: Database references
• Version 1.4: 2018-08-29
  Changes: Data collection, Source and taxonomy, Structure summary
• Version 1.5: 2023-12-27
  Changes: Data collection, Database references