期刊
JOURNAL OF CELL BIOLOGY
卷 160, 期 3, 页码 297-301出版社
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.200210066
关键词
kinesin II; dynactin; dynein; melanophores; organelle transport
类别
资金
- NIGMS NIH HHS [T32 GM07283, GM52111, GM60560, R01 GM060560, T32 GM007283, R01 GM052111] Funding Source: Medline
Kinesin II is a heterotrimeric plus end-directed microtubule motor responsible for the anterograde movement of organelles in various cell types. Despite substantial literature concerning the types of organelles that kinesin II transports, the question of how this motor associates with cargo organelles remains unanswered. To address this question, we have used Xenopus laevis melanophores as a model system. Through analysis of kinesin II-mediated melanosome motility, we have determined that the dynactin complex, known as an anchor for cytoplasmic dynein, also links kinesin II to organelles. Biochemical data demonstrates that the putative cargo-binding subunit of Xenopus kinesin II, Xenopus kinesin II-associated protein (XKAP), binds directly to the p150(Glued) subunit of dynactin. This interaction occurs through aa 530-793 of XKAP and aa 600-811 of p150(Glued). These results reveal that dynactin is required for transport activity of microtubule motors of opposite polarity, cytoplasmic dynein and kinesin II, and may provide a new mechanism to coordinate their activities.
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