2K79 image
Deposition Date 2008-08-08
Release Date 2009-03-10
Last Version Date 2024-05-01
Entry Detail
PDB ID:
2K79
Keywords:
Title:
Solution Structure of the binary complex between the SH3 and SH2 domain of interleukin-2 tyrosine kinase
Biological Source:
Source Organism:
Mus musculus (Taxon ID: 10090)
Host Organism:
Method Details:
Experimental Method:
Conformers Submitted:
1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:SH3 domain of Tyrosine-protein kinase ITK/TSK
Gene (Uniprot):Itk
Chain IDs:A
Chain Length:63
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Molecule:SH2 domain of Tyrosine-protein kinase ITK/TSK
Gene (Uniprot):Itk
Chain IDs:B
Chain Length:110
Number of Molecules:1
Biological Source:Mus musculus
Ligand Molecules
Primary Citation
Proline isomerization preorganizes the Itk SH2 domain for binding to the Itk SH3 domain.
J.Mol.Biol. 387 726 743 (2009)
PMID: 19361414 DOI: 10.1016/j.jmb.2009.02.012

Abstact

We report here the NMR-derived structure of the binary complex formed by the interleukin-2 tyrosine kinase (Itk) Src homology 3 (SH3) and Src homology 2 (SH2) domains. The interaction is independent of both a phosphotyrosine motif and a proline-rich sequence, the classical targets of the SH2 and SH3 domains, respectively. The Itk SH3/SH2 structure reveals the molecular details of this nonclassical interaction and provides a clear picture for how the previously described prolyl cis/trans isomerization present in the Itk SH2 domain mediates SH3 binding. The higher-affinity cis SH2 conformer is preorganized to form a hydrophobic interface with the SH3 domain. The structure also provides insight into how autophosphorylation in the Itk SH3 domain might increase the affinity of the intermolecular SH3/SH2 interaction. Finally, we can compare this Itk complex with other examples of SH3 and SH2 domains engaging their ligands in a nonclassical manner. These small binding domains exhibit a surprising level of diversity in their binding repertoires.

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Primary Citation of related structures