Motor-dependent microtubule disassembly driven by tubulin tyrosination.

Motor-dependent microtubule disassembly driven by tubulin tyrosination.
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DOI:
10.1083/jcb.200902142
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发表时间:
2009-06-29
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Andrieux A
Andrieux A
中科院分区:
其他
文献类型:
--
作者:
Peris L;Wagenbach M;Lafanechère L;Brocard J;Moore AT;Kozielski F;Job D;Wordeman L;Andrieux A

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在细胞中,稳定的微管(MT)被羧肽酶共价修饰,该羧肽酶去除α-微管蛋白的C-末端Tyr残基。MT的这种选择性脱酪氨酸作用的意义尚不清楚。在这项研究中,我们报告,微管蛋白酪氨酸在成纤维细胞抑制MT拆卸。这种抑制被解聚运动有丝分裂着丝粒相关驱动蛋白(MCAK)的过度表达所缓解。相反,MCAK表达的抑制阻止成纤维细胞中正常酪氨酸化MT的分解。MT的脱酪氨酸抑制MCAK在体外的活性,这显然是由于腺苷二磷酸(ADP)-无机磷酸盐-和ADP-结合形式的MCAK对MT晶格的亲和力降低。脱酪氨酸还损害神经元中的MT分解,并抑制体外神经元解聚运动KIF 2A的活性。这些结果表明,微管蛋白的脱酪氨酸直接抑制MT解聚马达,导致细胞MT的稳定。瞬时稳定的MT的脱酪氨酸作用可能会产生持久的抗分解聚合物亚群,以维持亚细胞的细胞骨架分化。
In cells, stable microtubules (MTs) are covalently modified by a carboxypeptidase, which removes the C-terminal Tyr residue of α-tubulin. The significance of this selective detyrosination of MTs is not understood. In this study, we report that tubulin detyrosination in fibroblasts inhibits MT disassembly. This inhibition is relieved by overexpression of the depolymerizing motor mitotic centromere-associated kinesin (MCAK). Conversely, suppression of MCAK expression prevents disassembly of normal tyrosinated MTs in fibroblasts. Detyrosination of MTs suppresses the activity of MCAK in vitro, apparently as the result of a decreased affinity of the adenosine diphosphate (ADP)–inorganic phosphate- and ADP-bound forms of MCAK for the MT lattice. Detyrosination also impairs MT disassembly in neurons and inhibits the activity of the neuronal depolymerizing motor KIF2A in vitro. These results indicate that MT depolymerizing motors are directly inhibited by the detyrosination of tubulin, resulting in the stabilization of cellular MTs. Detyrosination of transiently stabilized MTs may give rise to persistent subpopulations of disassembly-resistant polymers to sustain subcellular cytoskeletal differentiation.
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