Structural and mechanistic insights into the interaction between Pyk2 and paxillin LD motifs.

Structural and mechanistic insights into the interaction between Pyk2 and paxillin LD motifs.
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DOI:
10.1016/j.jmb.2014.08.014
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发表时间:
2014-12-12
影响因子:
5.6
通讯作者:
Zheng JJ
Zheng JJ
中科院分区:
生物学2区
文献类型:
--
作者:
Vanarotti MS;Miller DJ;Guibao CD;Nourse A;Zheng JJ

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富含脯氨酸的酪氨酸激酶2(Pyk 2)是细胞质酪氨酸激酶的粘着斑激酶(FAK)亚家族的成员。C-末端Pyk 2粘着斑靶向(Pyk 2-FAT)结构域与粘着分子桩蛋白结合。Paxillin具有五个亮氨酸-天冬氨酸(LD)基序(LD 1-LD 5)。在这里,我们表明,第二LD基序桩蛋白,LD 2,与Pyk 2-FAT相互作用,类似于已知的Pyk 2-FAT/LD 4相互作用。两个LD基序都可以靶向Pyk 2-FAT上的两个配体结合位点。有趣的是,它们也对Pyk 2-FAT具有相似的结合亲和力,相对于另一个位点优先与一个位点结合。尽管如此,桩蛋白(桩蛋白133 -290)的LD 2-LD 4区域与Pyk 2-FAT结合为1:1复合物。然而,我们的数据表明Pyk 2-FAT和桩蛋白复合物是动态的,并且它似乎是两种不同构象的桩蛋白的混合物,这两种构象几乎同等地竞争Pyk 2-FAT结合。这些研究提供了深入了解桩蛋白对Pyk 2和FAK的潜在选择性,这可能影响这两种密切相关的激酶在粘着斑部位的不同行为。
Proline-rich tyrosine kinase 2 (Pyk2) is a member of the focal adhesion kinase (FAK) subfamily of cytoplasmic tyrosine kinases. The C-terminal Pyk2 focal adhesion-targeting (Pyk2-FAT) domain binds to paxillin, an adhesion molecule. Paxillin has five leucine-aspartate (LD) motifs (LD1–LD5). Here, we show that the second LD motif of paxillin, LD2, interacts with Pyk2-FAT, similar to the known Pyk2-FAT/LD4 interaction. Both LD motifs can target two ligand-binding sites on Pyk2-FAT. Interestingly, they also share similar binding affinity for Pyk2-FAT with preferential association to one site relative to the other. Nevertheless, the LD2–LD4 region of paxillin (paxillin133–290) binds to Pyk2-FAT as a 1:1 complex. However, our data suggests that the Pyk2-FAT and paxillin complex is dynamic and it appears to be a mixture of two distinct conformations of paxillin which almost equally compete for Pyk2-FAT binding. These studies provide insight into the underlying selectivity of paxillin for Pyk2 and FAK which may influence the differing behavior of these two closely-related kinases in focal adhesion sites.
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