Family-wide characterization of the DENN domain Rab GDP-GTP exchange factors.

Family-wide characterization of the DENN domain Rab GDP-GTP exchange factors.
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DOI:
10.1083/jcb.201008051
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发表时间:
2010-10-18
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Barr FA
Barr FA
中科院分区:
其他
文献类型:
--
作者:
Yoshimura S;Gerondopoulos A;Linford A;Rigden DJ;Barr FA

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17种具有Denn结构域的蛋白质的靶标或底物Rab GTP酶被鉴定。Rab在膜运输中发挥作用的一个关键要求是由GDP-GTP交换因子(GEF)特异性地激活,但63个人RAB中的大多数都没有已知的全环基金。我们已经对17个人类Denn结构域蛋白进行了系统的表征,并证明它们是10个RAB的特异性GEF。DENND1A/1B定位于质膜上的网状蛋白斑块,并在内吞途径中激活Rab35,将志贺毒素输送到跨高尔基网络。DENND2 GEF以肌动蛋白细丝为靶标,控制Rab9依赖的甘露糖-6-磷酸受体向溶酶体的转运。DENND4 GEF靶向高尔基体附近的管状膜隔室,在那里它们激活Rab10,这表明在上皮细胞的基侧极化分类中,与作用于Rab8的非Denn环境基金Sec2在根尖分类中的作用互补。DENND1C、DENND3、DENND5A/5B、MTMR5/13和MADD分别激活Rab13、Rab12、Rab39、Rab28和Rab27A/27B。综上所述,这些发现为未来研究RAB的调控和功能提供了基础。
Target or substrate Rab GTPases are identified for 17 proteins with DENN domains. A key requirement for Rab function in membrane trafficking is site-specific activation by GDP-GTP exchange factors (GEFs), but the majority of the 63 human Rabs have no known GEF. We have performed a systematic characterization of the 17 human DENN domain proteins and demonstrated that they are specific GEFs for 10 Rabs. DENND1A/1B localize to clathrin patches at the plasma membrane and activate Rab35 in an endocytic pathway trafficking Shiga toxin to the trans-Golgi network. DENND2 GEFs target to actin filaments and control Rab9-dependent trafficking of mannose-6-phosphate receptor to lysosomes. DENND4 GEFs target to a tubular membrane compartment adjacent to the Golgi, where they activate Rab10, which suggests a function in basolateral polarized sorting in epithelial cells that compliments the non-DENN GEF Sec2 acting on Rab8 in apical sorting. DENND1C, DENND3, DENND5A/5B, MTMR5/13, and MADD activate Rab13, Rab12, Rab39, Rab28, and Rab27A/27B, respectively. Together, these findings provide a basis for future studies on Rab regulation and function.
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