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首页> 外文期刊>Molecular biology of the cell >An InCytes from MBC Selection: An α-Helical Extension of the ELMO1 Pleckstrin Homology Domain Mediates Direct Interaction to DOCK180 and Is Critical in Rac Signaling
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An InCytes from MBC Selection: An α-Helical Extension of the ELMO1 Pleckstrin Homology Domain Mediates Direct Interaction to DOCK180 and Is Critical in Rac Signaling

机译:MBC选择中的InCytes:ELMO1 Pleckstrin同源域的α螺旋延伸介导与DOCK180的直接相互作用,并且在Rac信号传导中至关重要

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The mammalian DOCK180 protein belongs to an evolutionarily conserved protein family, which together with ELMO proteins, is essential for activation of Rac GTPase-dependent biological processes. Here, we have analyzed the DOCK180-ELMO1 interaction, and map direct interaction interfaces to the N-terminal 200 amino acids of DOCK180, and to the C-terminal 200 amino acids of ELMO1, comprising the ELMO1 PH domain. Structural and biochemical analysis of this PH domain reveals that it is incapable of phospholipid binding, but instead structurally resembles FERM domains. Moreover, the structure revealed an N-terminal amphiphatic α-helix, and point mutants of invariant hydrophobic residues in this helix disrupt ELMO1-DOCK180 complex formation. A secondary interaction between ELMO1 and DOCK180 is conferred by the DOCK180 SH3 domain and proline-rich motifs at the ELMO1 C-terminus. Mutation of both DOCK180-interaction sites on ELMO1 is required to disrupt the DOCK180-ELMO1 complex. Significantly, although this does not affect DOCK180 GEF activity toward Rac in vivo, Rac signaling is impaired, implying additional roles for ELMO in mediating intracellular Rac signaling.
机译:哺乳动物的DOCK180蛋白属于进化保守的蛋白家族,与ELMO蛋白一起对于激活Rac GTPase依赖性生物过程至关重要。在这里,我们已经分析了DOCK180-ELMO1相互作用,并将直接相互作用的界面映射到DOCK180的N末端200个氨基酸,以及包含ELMO1 PH域的ELMO1的C末端200个氨基酸。此PH结构域的结构和生化分析表明,它无法磷脂结合,但结构上类似于FERM结构域。此外,该结构揭示了一个N端两亲性α-螺旋,该螺旋中不变的疏水残基的点突变体破坏了ELMO1-DOCK180复合物的形成。 ELMO1和DOCK180之间的次要相互作用是由ELMO1 C末端的DOCK180 SH3域和富含脯氨酸的基序赋予的。需要突变ELMO1上的两个DOCK180相互作用位点才能破坏DOCK180-ELMO1复合物。值得注意的是,尽管这并不影响DOCK180 GEF在体内对Rac的活性,但Rac信号传导受到了损害,这暗示了ELMO在介导细胞内Rac信号传导中的其他作用。

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