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.
Andreotti, Amy H.
中科院分区:
生物学2区
文献类型:
--
作者:
Joseph, Raji E.;Severin, Andrew;Min, Lie;Fulton, D. Bruce;Andreotti, Amy H.

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Tec家族激酶Itk在其SH 3结构域内的Y180上经历顺式自磷酸化。Itk激酶结构域对Itk SH 3结构域的自磷酸化严格依赖于中间SH 2结构域的存在。Itk激酶和SH 2结构域之间的直接对接相互作用将Itk SH 3结构域带入活性位点,然后Y180被磷酸化。我们现在确定的Itk SH 2结构域负责基板对接的表面上的残基,并表明该SH 2表面介导的全长Itk分子中的自磷酸化。SH 2结构域上的典型磷脂配体结合位点不参与底物对接,而是对接位点由来自三个环区(AB、EF和BG)的侧链和部分βD链组成。这些结果扩展到Btk,Tec家族激酶连接到B细胞缺陷X-连锁无丙种球蛋白血症(XLA)。我们的研究结果表明,一些XLA引起的突变可能会损害Btk磷酸化。
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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