Macromolecule Content

• Total Structure Weight: 8959.75 
• Atom Count: 568 
• Residue Count: 81 
• Unique protein chains: 2

1AZG

NMR STUDY OF THE SH3 DOMAIN FROM FYN PROTO-ONCOGENE TYROSINE KINASE KINASE COMPLEXED WITH THE SYNTHETIC PEPTIDE P2L CORRESPONDING TO RESIDUES 91-104 OF THE P85 SUBUNIT OF PI3-KINASE, MINIMIZED AVERAGE (PROBMAP) STRUCTURE

• DOI: 10.2210/pdb1AZG/pdb

• Classification: COMPLEX (PHOSPHOTRANSFERASE/PEPTIDE)
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 1997-11-18 Released: 1998-02-25 
• Deposition Author(s): Renzoni, D.A., Pugh, D.J.R., Siligardi, G., Das, P., Morton, C.J., Rossi, C., Waterfield, M.D., Campbell, I.D., Ladbury, J.E.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 1 

Literature

Structural and thermodynamic characterization of the interaction of the SH3 domain from Fyn with the proline-rich binding site on the p85 subunit of PI3-kinase.

Renzoni, D.A., Pugh, D.J., Siligardi, G., Das, P., Morton, C.J., Rossi, C., Waterfield, M.D., Campbell, I.D., Ladbury, J.E.

(1996) Biochemistry 35: 15646-15653

• PubMed: 8961927 
• DOI: 10.1021/bi9620969
• Primary Citation of Related Structures:  
  1A0N


• PubMed Abstract: 
  

The interaction of the Fyn SH3 domain with the p85 subunit of PI3-kinase is investigated using structural detail and thermodynamic data. The solution structure complex of the SH3 domain with a proline-rich peptide mimic of the binding site on the p85 subunit is described. This indicates that the peptide binds as a poly(L-proline) type II helix. Circular dichroism spectroscopic studies reveal that in the unbound state the peptide exhibits no structure. Thermodynamic data for the binding of this peptide to the SH3 domain suggest that the weak binding (approximately 31 microM) of this interaction is, in part, due to the entropically unfavorable effect of helix formation (delta S0 = -78 J.mol-1.K-1). Binding of the SH3 domain to the intact p85 subunit (minus its own SH3 domain) is tighter, and the entropic and enthalpic contributions are very different from those given by the peptide interaction (delta S0 = +252 J.mol-1.K-1; delta H0 = +44 kJ.mol-1). From these dramatically different thermodynamic measurements we are able to conclude that the interaction of the proline-rich peptide does not effectively mimic the interaction of the intact p85 subunit with the SH3 domain and suggest that other interactions could be important.

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Related Citations: 

• Solution Structure and Peptide Binding of the SH3 Domain from Human Fyn
  Morton, C.J.,Pugh, D.J.,Brown, E.L.,Kahmann, J.D.,Renzoni, D.A.,Campbell, I.D.
  (1996) Structure 4: 705




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Organizational Affiliation: 

Oxford Centre for Molecular Science, University of Oxford, U.K.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PRO-PRO-ARG-PRO-LEU-PRO-VAL-ALA-PRO-GLY-SER-SER-LYS-THR	A	14	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
FYN	B	67	Homo sapiens	Mutation(s): 0  Gene Names: FYN EC: 2.7.10.2
Find proteins for P06241 (Homo sapiens) Go to Gene View: FYN Go to UniProtKB:  P06241

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 1 

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1997-11-18 
• Released Date: 1998-02-25 
• Deposition Author(s): Renzoni, D.A., Pugh, D.J.R., Siligardi, G., Das, P., Morton, C.J., Rossi, C., Waterfield, M.D., Campbell, I.D., Ladbury, J.E.

Revision History 

• Version 1.0: 1998-02-25
  Type: Initial release
• Version 1.1: 2008-03-03
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance