Specific Rab GTPase-activating proteins define the Shiga toxin and epidermal growth factor uptake pathways.

Specific Rab GTPase-activating proteins define the Shiga toxin and epidermal growth factor uptake pathways.
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DOI:
10.1083/jcb.200612068
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发表时间:
2007-06-18
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:
Fuchs E;Haas AK;Spooner RA;Yoshimura S;Lord JM;Barr FA

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Rab家族鸟苷三磷酸酶(GTP酶)与它们的调节剂一起定义真核细胞内膜运输的特定途径。在这项研究中,我们已经调查了Rab GTP酶激活蛋白(GAP)可以干扰滋贺毒素从细胞表面到高尔基体的运输,并研究了表皮生长因子(EGF)从细胞表面到内体的运输。该筛选鉴定了39个预测的人Rab GAP中的6个(EVI 5、RN-tre/USP 6 NL、TBC 1D 10A-C和TBC 1D 17)作为滋贺毒素而不是EGF摄取的特异性调节剂。我们发现Rab 43是RN-tre的靶点,并且是滋贺毒素摄取所必需的。相比之下,RabGAP-5(Rab 5 GAP)在测试的GAP中是独特的,并且减少EGF的摄取,但不减少滋贺毒素。这些结果表明,滋贺毒素运输到高尔基体是一个多步骤的过程中控制的几个Rab GAP和他们的目标Rabs和这个过程是离散的配体诱导的EGF受体的运输。
Rab family guanosine triphosphatases (GTPases) together with their regulators define specific pathways of membrane traffic within eukaryotic cells. In this study, we have investigated which Rab GTPase-activating proteins (GAPs) can interfere with the trafficking of Shiga toxin from the cell surface to the Golgi apparatus and studied transport of the epidermal growth factor (EGF) from the cell surface to endosomes. This screen identifies 6 (EVI5, RN-tre/USP6NL, TBC1D10A–C, and TBC1D17) of 39 predicted human Rab GAPs as specific regulators of Shiga toxin but not EGF uptake. We show that Rab43 is the target of RN-tre and is required for Shiga toxin uptake. In contrast, RabGAP-5, a Rab5 GAP, was unique among the GAPs tested and reduced the uptake of EGF but not Shiga toxin. These results suggest that Shiga toxin trafficking to the Golgi is a multistep process controlled by several Rab GAPs and their target Rabs and that this process is discrete from ligand-induced EGF receptor trafficking.
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