Activation of cytoplasmic dynein motility by dynactin-cargo adapter complexes.

Activation of cytoplasmic dynein motility by dynactin-cargo adapter complexes.
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DOI:
10.1126/science.1254198
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发表时间:
2014-07-18
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Vale RD
Vale RD
中科院分区:
其他
文献类型:
--
作者:
McKenney RJ;Huynh W;Tanenbaum ME;Bhabha G;Vale RD

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Cytoplasmic dynein is a molecular motor that transports a large variety of cargoes (e.g., organelles, messenger RNAs, and viruses) along microtubules over long intracellular distances. The dynactin protein complex is important for dynein activity in vivo, but its precise role has been unclear. Here, we found that purified mammalian dynein did not move processively on microtubules in vitro. However, when dynein formed a complex with dynactin and one of four different cargo-specific adapter proteins, the motor became ultraprocessive, moving for distances similar to those of native cargoes in living cells. Thus, we propose that dynein is largely inactive in the cytoplasm and that a variety of adapter proteins activate processive motility by linking dynactin to dynein only when the motor is bound to its proper cargo.
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