Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Macromolecule Content

• Total Structure Weight: 161.49 kDa 
• Atom Count: 9365 
• Residue Count: 1136 
• Unique protein chains: 2

2RD0

Structure of a human p110alpha/p85alpha complex

• DOI: 10.2210/pdb2RD0/pdb

• Classification: Transferase/Oncoprotein
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 2007-09-20 Released: 2007-12-25 
• Deposition Author(s): Huang, C., Gabelli, S.B., Amzel, L.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.05 Å
• R-Value Free: 0.323 
• R-Value Work: 0.263 
• R-Value Observed: 0.267 

Literature

The structure of a human p110alpha/p85alpha complex elucidates the effects of oncogenic PI3Kalpha mutations.

Huang, C.H., Mandelker, D., Schmidt-Kittler, O., Samuels, Y., Velculescu, V.E., Kinzler, K.W., Vogelstein, B., Gabelli, S.B., Amzel, L.M.

(2007) Science 318: 1744-1748

• PubMed: 18079394 
• DOI: 10.1126/science.1150799
• Primary Citation of Related Structures:  
  2RD0


• PubMed Abstract: 
  

PIK3CA, one of the two most frequently mutated oncogenes in human tumors, codes for p110alpha, the catalytic subunit of a phosphatidylinositol 3-kinase, isoform alpha (PI3Kalpha, p110alpha/p85). Here, we report a 3.0 angstrom resolution structure of a complex between p110alpha and a polypeptide containing the p110alpha-binding domains of p85alpha, a protein required for its enzymatic activity. The structure shows that many of the mutations occur at residues lying at the interfaces between p110alpha and p85alpha or between the kinase domain of p110alpha and other domains within the catalytic subunit. Disruptions of these interactions are likely to affect the regulation of kinase activity by p85 or the catalytic activity of the enzyme, respectively. In addition to providing new insights about the structure of PI3Kalpha, these results suggest specific mechanisms for the effect of oncogenic mutations in p110alpha and p85alpha.

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Organizational Affiliation: 

Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit alpha isoform	A	1096	Homo sapiens	Mutation(s): 0  Gene Names: PIK3CA EC: 2.7.1.153 (PDB Primary Data), 2.7.11.1 (UniProt)
Find proteins for P42336 (Homo sapiens) Explore P42336  Go to UniProtKB:  P42336
NIH Common Fund Data Resources
PHAROS:  P42336 GTEx:  ENSG00000121879

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Phosphatidylinositol 3-kinase regulatory subunit alpha	B	279	Homo sapiens	Mutation(s): 0  Gene Names: PIK3R1, GRB1
Find proteins for P27986 (Homo sapiens) Explore P27986  Go to UniProtKB:  P27986
NIH Common Fund Data Resources
PHAROS:  P27986 GTEx:  ENSG00000145675

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.05 Å
• R-Value Free: 0.323 
• R-Value Work: 0.263 
• R-Value Observed: 0.267 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 115.058	α = 90
b = 117.05	β = 90
c = 151.584	γ = 90

Software Package:

Software Name	Purpose
AMoRE	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
ADSC	data collection
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2007-09-20 
• Released Date: 2007-12-25 
Deposition Author(s): Huang, C., Gabelli, S.B., Amzel, L.M.

Revision History 

• Version 1.0: 2007-12-25
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance