1X27

Crystal Structure of Lck SH2-SH3 with SH2 binding site of p130Cas


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.247 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Molecular basis for regulation of Src by the docking protein p130Cas

Nasertorabi, F.Tars, K.Becherer, K.Kodandapani, R.Liljas, L.Vuori, K.Ely, K.R.

(2006) J.MOL.RECOG. 19: 30-38

  • DOI: 10.1002/jmr.755

  • PubMed Abstract: 
  • The docking protein p130Cas (Cas) becomes tyrosine-phosphorylated in its central substrate domain in response to extracellular stimuli such as integrin-mediated cell adhesion, and transmits signals through interactions with various intracellular sign ...

    The docking protein p130Cas (Cas) becomes tyrosine-phosphorylated in its central substrate domain in response to extracellular stimuli such as integrin-mediated cell adhesion, and transmits signals through interactions with various intracellular signaling molecules such as the adaptor protein Crk. Src-family kinases (SFKs) bind a specific site in the carboxyl-terminal region of Cas and subsequently SFKs phosphorylate progressively the substrate domain in Cas. In this study crystallography, mutagenesis and binding assays were used to understand the molecular basis for Cas interactions with SFKs. Tyrosine phosphorylation regulates binding of Cas to SFKs, and the primary site for this phosphorylation, Y762, has been proposed. A phosphorylated peptide corresponding to Cas residues 759MEDpYDYVHL767 containing the key phosphotyrosine was crystallized in complex with the SH3-SH2 domain of the SFK Lck. The results provide the first structural data for this protein-protein interaction. The motif in Cas 762pYDYV binds to the SH2 domain in a mode that mimics high-affinity ligands, involving dual contacts of Y762 and V765 with conserved residues in SFK SH2 domains. In addition, Y764 is in position to make an electrostatic contact after phosphorylation with a conserved SFK arginine that mediates interactions with other high-affinity SH2 binders. These new molecular data suggest that Cas may regulate activity of Src as a competing ligand to displace intramolecular interactions that occur in SFKs (between the C-terminal tail and the SH2 domain) and restrain and down-regulate the kinase in an inactive form.


    Organizational Affiliation

    Cancer Center, The Burnham Institute for Medical Research, La Jolla, California 92037, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Proto-oncogene tyrosine-protein kinase LCK
A, B, C, D, E, F
167Homo sapiensMutation(s): 0 
Gene Names: LCK
EC: 2.7.10.2
Find proteins for P06239 (Homo sapiens)
Go to Gene View: LCK
Go to UniProtKB:  P06239
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CRK-associated substrate
I, J, K, L, M, N
9Rattus norvegicusMutation(s): 0 
Gene Names: Bcar1 (Cas, Crkas)
Find proteins for Q63767 (Rattus norvegicus)
Go to UniProtKB:  Q63767
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
A, B, C, D, E, F
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PTR
Query on PTR
I, J, K, L, M, N
L-PEPTIDE LINKINGC9 H12 N O6 PTYR
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
PTRKd: 400000 nM (100) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.247 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 77.415α = 90.00
b = 107.289β = 90.00
c = 166.389γ = 90.00
Software Package:
Software NamePurpose
CCP4data scaling
CNSphasing
MOSFLMdata reduction
SCALAdata scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-02-07
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance