JSAP1 and JLP are required for ARF6 localization to the midbody in cytokinesis

JSAP1 and JLP are required for ARF6 localization to the midbody in cytokinesis
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在胞质分裂中,ARF6 定位到中间体需要 JSAP1 和 JLP

DOI:
10.1111/gtc.12170
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发表时间:
2014
期刊:
影响因子:
2.1
通讯作者:
K. Yoshioka
K. Yoshioka
中科院分区:
生物学4区
文献类型:
--
作者:
Baljinnyam Tuvshintugs;Tokiharu Sato;Radnaa Enkhtuya;K. Yamashita;K. Yoshioka

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ADP-核糖基化因子6(ARF 6)GTP酶在胞质分裂中很重要,并定位于中间体。然而,ARF 6募集到中间体的机制和调节在很大程度上是未知的。在这里,我们通过小鼠胚胎成纤维细胞中的基因敲除和拯救实验,研究了活性ARF 6的两种结合伴侣,c-Jun NH 2-末端激酶(JNK)/应激活化蛋白激酶相关蛋白1(JSAP 1)和JNK相关亮氨酸拉链蛋白(JLP)的功能。耗尽JSAP 1和JLP削弱了ARF 6在中间体的定位,并延迟了胞质分裂。这些缺陷几乎完全被野生型JSAP 1或JLP挽救,但不能被不能与活性ARF 6或驱动蛋白1的驱动蛋白重链(KHC)相互作用的JSAP 1或JLP突变体挽救。在转染细胞中,组成型活性形式的ARF 6仅在与野生型JSAP 1或JLP共表达时与KHC相关,而与JSAP 1或JLP突变体不相关。这些研究结果表明,JSAP 1和JLP可能彼此同源,在胞质分裂中是关键的和功能冗余的,并通过形成JSAP 1/JLP、活性ARF 6和驱动蛋白-1的三方复合物来控制ARF 6定位到中间体。
The ADP‐ribosylation factor 6 (ARF6) GTPase is important in cytokinesis and localizes to the midbody. However, the mechanism and regulation of ARF6's recruitment to the midbody are largely unknown. Here, we investigated the functions of two binding partners of active ARF6, c‐Jun NH2‐terminal kinase (JNK)/stress‐activated protein kinase‐associated protein 1 (JSAP1) and JNK‐associated leucine zipper protein (JLP), by gene knockout and rescue experiments in mouse embryonic fibroblasts. Depleting both JSAP1 and JLP impaired ARF6's localization to the midbody and delayed cytokinesis. These defects were almost completely rescued by wild‐type JSAP1 or JLP, but not by JSAP1 or JLP mutants that were unable to interact with active ARF6 or with the kinesin heavy chain (KHC) of kinesin‐1. In transfected cells, a constitutively active form of ARF6 associated with KHC only when co‐expressed with wild‐type JSAP1 or JLP and not with a JSAP1 or JLP mutant. These findings suggest that JSAP1 and JLP, which might be paralogous to each other, are critical and functionally redundant in cytokinesis and control ARF6 localization to the midbody by forming a tripartite complex of JSAP1/JLP, active ARF6, and kinesin‐1.
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