1FU5

NMR STRUCTURE OF THE N-SH2 DOMAIN OF THE P85 SUBUNIT OF PI3-KINASE COMPLEXED TO A DOUBLY PHOSPHORYLATED PEPTIDE DERIVED FROM POLYOMAVIRUS MIDDLE T ANTIGEN


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 110 
  • Conformers Submitted: 
  • Selection Criteria: structures with favorable non-bond energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

NMR structure of the N-SH2 of the p85 subunit of phosphoinositide 3-kinase complexed to a doubly phosphorylated peptide reveals a second phosphotyrosine binding site.

Weber, T.Schaffhausen, B.Liu, Y.Gunther, U.L.

(2000) Biochemistry 39: 15860-15869

  • Primary Citation of Related Structures:  1FU6

  • PubMed Abstract: 
  • The N-terminal src homology 2 (SH2) domain of the p85 subunit of phosphoinositide 3-kinase (PI3K) has a higher affinity for a peptide with two phosphotyrosines than for the same peptide with only one. This unexpected result was not observed for the C ...

    The N-terminal src homology 2 (SH2) domain of the p85 subunit of phosphoinositide 3-kinase (PI3K) has a higher affinity for a peptide with two phosphotyrosines than for the same peptide with only one. This unexpected result was not observed for the C-terminal SH2 from the same protein. NMR structural analysis has been used to understand the behavior of the N-SH2. The structure of the free SH2 domain has been compared to that of the SH2 complexed with a doubly phosphorylated peptide derived from polyomavirus middle T antigen (MT). The structure of the free SH2 domain shows some differences from previous NMR and X-ray structures. In the N-SH2 complexed with a doubly phosphorylated peptide, a second site for phosphotyrosine interaction has been identified. Further, line shapes of NMR signals showed that the SH2 protein-ligand complex is subject to temperature-dependent conformational mobility. Conformational mobility is also supported by the spectra of the ligand peptide. A binding model which accounts for these results is developed.


    Organizational Affiliation

    Institut für Biophysikalische Chemie, J. W. Goethe Universität, Frankfurt, Biozentrum N230, Marie-Curie-Strasse 9, 60439 Frankfurt, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PHOSPHATIDYLINOSITOL 3-KINASE REGULATORY ALPHA SUBUNIT
A
111Rattus norvegicusGene Names: Pik3r1
Find proteins for Q63787 (Rattus norvegicus)
Go to UniProtKB:  Q63787
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
DOUBLY PHOSPHORYLATED MIDDLE T ANTIGEN
B
15N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PTR
Query on PTR
B
L-PEPTIDE LINKINGC9 H12 N O6 PTYR
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 110 
  • Conformers Submitted: 
  • Selection Criteria: structures with favorable non-bond energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-02-21
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance