Structure of the Bovine p85a BH domain R228E mutant

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Insight into the PTEN - p85 alpha interaction and lipid binding properties of the p85 alpha BH domain.

Marshall, J.D.S.Mellor, P.Ruan, X.Whitecross, D.E.Moore, S.A.Anderson, D.H.

(2018) Oncotarget 9: 36975-36992

  • DOI: https://doi.org/10.18632/oncotarget.26432
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The phosphatidylinositol 3-kinase (PI3K) pathway plays a key role in regulating cell growth and cell survival and is frequently deregulated in cancer cells. p85α regulates the p110α lipid kinase, and also stabilizes and stimulates PTEN, the lipid phosphatase that downregulates this pathway. In this report, we determined that the p85α BH domain binds several phosphorylated phosphoinositide lipids, an interaction that could help localize p85α to membranes rich in these lipids. We also identified key residues responsible for mediating PTEN - p85α complex formation. Based on these experimental results, a docking model for the PTEN - p85α BH domain complex was developed that is consistent with the known binding interactions for both PTEN and p85α. This model involves extensive side-chain and peptide backbone contacts between both the PASE and C2 domains of PTEN with the p85α BH domains. The p85α BH domain residues shown to be important for PTEN binding were p85α residues E212, Q221, K225, R228 and H234. We also verified experimentally the importance of PTEN-E91 in mediating the interaction with the p85α BH domain. These results shed new light on the mechanism of PTEN regulation by p85α.

  • Organizational Affiliation

    Cancer Research Group, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5E5, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Phosphatidylinositol 3-kinase regulatory subunit alphaA [auth B],
B [auth A]
220Bos taurusMutation(s): 1 
Gene Names: PIK3R1
Find proteins for P23727 (Bos taurus)
Explore P23727 
Go to UniProtKB:  P23727
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP23727
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on CSO
A [auth B],
B [auth A]
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.187α = 90
b = 92.697β = 90
c = 93.117γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Canadian Institutes of Health Research (CIHR)CanadaMOP84277
Canadian Institutes of Health Research (CIHR)CanadaMOP126155
Natural Sciences and Engineering Research Council (NSERC, Canada)CanadaRGPIN262138

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-30
    Type: Initial release
  • Version 1.1: 2020-01-08
    Changes: Author supporting evidence
  • Version 1.2: 2024-04-03
    Changes: Data collection, Database references, Refinement description