拉布
内体
生物
细胞生物学
GTP酶
秀丽隐杆线虫
小型GTPase
转运蛋白
生物化学
信号转导
细胞内
基因
作者
Dmitry Poteryaev,Sunando Datta,Karin Ackema,Marino Zerial,Anne Spang
出处
期刊:Cell
[Elsevier]
日期:2010-04-01
卷期号:141 (3): 497-508
被引量:677
标识
DOI:10.1016/j.cell.2010.03.011
摘要
Sequential transport from early to late endosomes requires the coordinated activities of the small GTPases Rab5 and Rab7. The transition between early and late endosomes could be mediated either through transport carriers or by Rab conversion, a process in which the loss of Rab5 from an endosome occurs concomitantly to the acquisition of Rab7. We demonstrate that Rab conversion is the mechanism by which proteins pass from early to late endosomes in Caenorhabditis elegans coelomocytes. Moreover, we identified SAND-1/Mon1 as the critical switch for Rab conversion in metazoa. SAND-1 serves a dual role in this process. First, it interrupts the positive feedback loop of RAB-5 activation by displacing RABX-5 from endosomal membranes; second, it times the recruitment of RAB-7, probably through interaction with the HOPS complex to the same membranes. SAND-1/Mon1 thus acts as a switch by controlling the localization of RAB-5 and RAB-7 GEFs.
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