Myosin V transports secretory vesicles via a Rab GTPase cascade and interaction with the exocyst complex.

Myosin V transports secretory vesicles via a Rab GTPase cascade and interaction with the exocyst complex.
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DOI:
10.1016/j.devcel.2011.10.009
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发表时间:
2011-12-13
期刊:
影响因子:
11.8
通讯作者:
Weisman, Lois S.
Weisman, Lois S.
中科院分区:
生物学1区
文献类型:
--
作者:
Jin, Yui;Sultana, Azmiri;Gandhi, Pallavi;Franklin, Edward;Hamamoto, Susan;Khan, Amir R.;Munson, Mary;Schekman, Randy;Weisman, Lois S.

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Vesicle transport requires four steps; vesicle formation, movement, tethering and fusion. In yeast, two Rab GTPases, Ypt31/32 are required for post-Golgi vesicle formation. A third Rab GTPase, Sec4, and the exocyst act in tethering and fusion of these vesicles. Vesicle production is coupled to transport via direct interaction between Ypt31/32 and the yeast myosin V, Myo2. Here we show that Myo2 interacts directly with Sec4, and the exocyst subunit Sec15. Disruption of these interactions results in compromised growth and the accumulation of secretory vesicles. We identified the Sec15-binding region on Myo2, and also identified residues on Sec15 required for interaction with Myo2. That Myo2 interacts with Sec15 uncovers additional roles for the exocyst as an adaptor for molecular motors, and implies similar roles for structurally related tethering complexes. Moreover, these studies predict that for many pathways, molecular motors attach to vesicles prior to their formation, and remain attached until fusion.
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