Macromolecule Content

• Total Structure Weight: 13339.90 
• Atom Count: 938 
• Residue Count: 118 
• Unique protein chains: 2

1PIC

PHOSPHATIDYLINOSITOL 3-KINASE, P85-ALPHA SUBUNIT: C-TERMINAL SH2 DOMAIN COMPLEXED WITH A TYR751 PHOSPHOPEPTIDE FROM THE PDGF RECEPTOR, NMR, MINIMIZED MEAN STRUCTURE

• DOI: 10.2210/pdb1PIC/pdb

• Classification: COMPLEX (PHOSPHOTRANSFERASE/RECEPTOR)
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 1997-06-23 Released: 1997-09-17 
• Deposition Author(s): Breeze, A.L., Kara, B.V., Barratt, D.G., Anderson, M., Smith, J.C., Luke, R.W., Best, J.R., Cartlidge, S.A.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 1 

Literature

Structure of a specific peptide complex of the carboxy-terminal SH2 domain from the p85 alpha subunit of phosphatidylinositol 3-kinase.

Breeze, A.L., Kara, B.V., Barratt, D.G., Anderson, M., Smith, J.C., Luke, R.W., Best, J.R., Cartlidge, S.A.

(1996) EMBO J. 15: 3579-3589

• PubMed: 8670861 


• PubMed Abstract: 
  

We have determined the solution structure of the C-terminal SH2 domain of the p85 alpha subunit of human phosphatidylinositol (PI) 3-kinase (EC 2.7.1.137) in complex with a phosphorylated tyrosine pentapeptide sequence from the platelet-derived growth factor receptor using heteronuclear nuclear magnetic resonance spectroscopy. Overall, the structure is similar to other SH2 domain complexes, but displays different detail interactions within the phosphotyrosine binding site and in the recognition site for the +3 methionine residue of the peptide, the side chain of which inserts into a particularly deep and narrow pocket which is displaced relative to that of other SH2 domains. The contacts made within this +3 pocket provide the structural basis for the strong selection for methionine at this position which characterizes the SH2 domains of PI3-kinase. Comparison with spectral and structural features of the uncomplexed domain shows that the long BG loop becomes less mobile in the presence of the bound peptide. In contrast, extreme resonance broadening encountered for most residues in the beta D', beta E and beta F strands and associated connecting loops of the domain in the absence of peptide persists in the complex, implying conformational averaging in this part of the molecule on a microsecond-to-millisecond time scale.

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Organizational Affiliation: 

Protein Structure Laboratory, Zeneca Pharmaceuticals, Mereside, Alderley Park, Cheshire, UK.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PHOSPHATIDYLINOSITOL 3-KINASE	A	112	Homo sapiens	Mutation(s): 0  Gene Names: PIK3R1 (GRB1)
Find proteins for P27986 (Homo sapiens) Go to Gene View: PIK3R1 Go to UniProtKB:  P27986

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
BETA-PLATELET-DERIVED GROWTH FACTOR RECEPTOR	B	6	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Small Molecules

Modified Residues  2 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
PTR	B	L-PEPTIDE LINKING	C9 H12 N O6 P		TYR
ACE	B	NON-POLYMER	C2 H4 O		--

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 1 

Software Package:

Software Name	Purpose
X-PLOR	phasing
X-PLOR	model building
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1997-06-23 
• Released Date: 1997-09-17 
• Deposition Author(s): Breeze, A.L., Kara, B.V., Barratt, D.G., Anderson, M., Smith, J.C., Luke, R.W., Best, J.R., Cartlidge, S.A.

Revision History 

• Version 1.0: 1997-09-17
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance