SH2-dependent autophosphorylation within the Tec family kinase Itk.
SH2-dependent autophosphorylation within the Tec family kinase Itk.
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DOI:
10.1016/j.jmb.2009.06.023
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发表时间:
2009-08-07
影响因子:
5.6
通讯作者:
Andreotti, Amy H.
中科院分区:
文献类型:
--
作者:
Joseph, Raji E.;Severin, Andrew;Min, Lie;Fulton, D. Bruce;Andreotti, Amy H.
The Tec family kinase, Itk, undergoes an in cis autophosphorylation on Y180 within its SH3 domain. Autophosphorylation of the Itk SH3 domain by the Itk kinase domain is strictly dependent on the presence of the intervening SH2 domain. A direct docking interaction between the Itk kinase and SH2 domains brings the Itk SH3 domain into the active site where Y180 is then phosphorylated. We now identify the residues on the surface of the Itk SH2 domain responsible for substrate docking and show that this SH2 surface mediates autophosphorylation in the full length Itk molecule. The canonical phospholigand binding site on the SH2 domain is not involved in substrate docking, instead the docking site consists of side chains from three loop regions (AB, EF and BG) and part of the βD strand. These results are extended into Btk, a Tec family kinase linked to the B cell deficiency X-linked agammaglobulinemia (XLA). Our results suggest that some XLA causing mutations might impair Btk phosphorylation.
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