Structural basis for the recognition of c-Src by its inactivator Csk.

Structural basis for the recognition of c-Src by its inactivator Csk.
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DOI:
10.1016/j.cell.2008.05.051
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发表时间:
2008-07-11
期刊:
影响因子:
64.5
通讯作者:
Kuriyan J
Kuriyan J
中科院分区:
生物学1区
文献类型:
--
作者:
Levinson NM;Seeliger MA;Cole PA;Kuriyan J

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酪氨酸激酶的Src家族的催化活性被位于C-末端附近的酪氨酸残基(c-Src中的Tyr 527)上的磷酸化抑制,其由C-末端Src激酶(Csk)催化。鉴于大多数酪氨酸激酶的混杂性,值得注意的是Src家族激酶的C-末端尾是Csk的唯一已知靶标。我们已经确定了在2.9 nm分辨率的激酶结构域的Csk和c-Src之间的复合物的晶体结构,揭示了这些激酶之间的相互作用的位置的C-末端尾部的c-Src的边缘的活性位点的Csk。Csk不能磷酸化缺乏这种对接机制的底物,因为大多数酪氨酸激酶用于识别底物的常规底物结合位点在Csk中由于活化环中的缺失而不稳定。
The catalytic activity of the Src family of tyrosine kinases is suppressed by phosphorylation on a tyrosine residue located near the C-terminus (Tyr 527 in c-Src), which is catalyzed by C-terminal Src Kinase (Csk). Given the promiscuity of most tyrosine kinases, it is remarkable that the C-terminal tails of the Src family kinases are the only known targets of Csk. We have determined the crystal structure of a complex between the kinase domains of Csk and c-Src at 2.9 Å resolution, revealing that interactions between these kinases position the C-terminal tail of c-Src at the edge of the active site of Csk. Csk cannot phosphorylate substrates that lack this docking mechanism because the conventional substrate binding site, used by most tyrosine kinases to recognize substrates, is destabilized in Csk by a deletion in the activation loop.
ABL酪氨酸激酶结构域中的SRC样不活跃构象。
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