Two binding partners cooperate to activate the molecular motor Kinesin-1.

Two binding partners cooperate to activate the molecular motor Kinesin-1.
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DOI:
10.1083/jcb.200605099
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发表时间:
2007-01-01
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Verhey KJ
Verhey KJ
中科院分区:
其他
文献类型:
--
作者:
Blasius TL;Cai D;Jih GT;Toret CP;Verhey KJ

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The regulation of molecular motors is an important cellular problem, as motility in the absence of cargo results in futile adenosine triphosphate hydrolysis. When not transporting cargo, the microtubule (MT)-based motor Kinesin-1 is kept inactive as a result of a folded conformation that allows autoinhibition of the N-terminal motor by the C-terminal tail. The simplest model of Kinesin-1 activation posits that cargo binding to nonmotor regions relieves autoinhibition. In this study, we show that binding of the c-Jun N-terminal kinase–interacting protein 1 (JIP1) cargo protein is not sufficient to activate Kinesin-1. Because two regions of the Kinesin-1 tail are required for autoinhibition, we searched for a second molecule that contributes to activation of the motor. We identified fasciculation and elongation protein ζ1 (FEZ1) as a binding partner of kinesin heavy chain. We show that binding of JIP1 and FEZ1 to Kinesin-1 is sufficient to activate the motor for MT binding and motility. These results provide the first demonstration of the activation of a MT-based motor by cellular binding partners.
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