Models for the functions of Arf GAPs.

Models for the functions of Arf GAPs.
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DOI:
10.1016/j.semcdb.2010.07.002
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发表时间:
2011-02
影响因子:
7.3
通讯作者:
Kahn RA
Kahn RA
中科院分区:
生物学2区
文献类型:
--
作者:
East MP;Kahn RA

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Arf GAP(ADP-核糖基化因子GTP酶激活蛋白)是ADP-核糖基化因子(ADP-ribosylation factor)信号通路的重要组成部分。Arf GAP刺激GTP水解为GDP,以将Arf从活性GTP结合状态转变为非活性GDP结合状态。基于这种活性,Arf GAP最初被提出主要或专门作为Arf信号传导的终止子。对Arf GAP的进一步研究表明,它们也在至少几个Arf不直接参与的步骤或过程中作为Arf信号传导的效应物发挥作用。在这篇综述中,我们讨论了Arf GAP的非经典功能,并解决了该领域的几个关键问题,包括:(1)Arf GAP是Arf信号的终止子还是效应子,(2)Arf GAP正或负调节COPI组装,(3)Arf GAP参与囊泡分裂,(4)Arf GAP调节囊泡脱壳。
Arf GAPs (ADP-ribosylation factor GTPase activating proteins) are essential components of Arf (ADP-ribosylation factor) signaling pathways. Arf GAPs stimulate the hydrolysis of GTP to GDP to transition Arf from the active, GTP bound, state to the inactive, GDP bound, state. Based on this activity, Arf GAPs were initially proposed to function primarily or exclusively as terminators of Arf signaling. Further studies of Arf GAPs have revealed that they also function as effectors of Arf signaling in at least a few steps or processes in which Arfs are not directly involved. In this review we discuss the non-canonical functions of Arf GAPs and address several key questions in the field, including: whether (1) Arf GAPs are terminators or effectors of Arf signaling, (2) Arf GAPs positively or negatively regulate COPI assembly, (3) Arf GAPs are involved in vesicle fission, and (4) Arf GAPs regulate vesicle uncoating.
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