作者
Jan-Heiko Lenz, Isabel Schuchardt, Anne Straube, Gero Steinberg
发表日期
2006/6/7
期刊
The EMBO journal
卷号
25
期号
11
页码范围
2275-2286
出版商
John Wiley & Sons, Ltd
简介
In the fungus Ustilago maydis, early endosomes move bidirectionally along microtubules (MTs) and facilitate growth by local membrane recycling at the tip of the infectious hypha. Here, we set out to elucidate the molecular mechanism of this process. We show that endosomes travel by Kinesin‐3 activity into the hyphal apex, where they reverse direction and move backwards in a dynein‐dependent manner. Our data demonstrate that dynein, dynactin and Lis1 accumulate at MT plus‐ends within the hyphal tip, where they provide a reservoir of inactive motors for retrograde endosome transport. Consistently, endosome traffic is abolished after depletion of the dynein activator Lis1 and in Kinesin‐1 null mutants, which was due to a defect in targeting of dynein and dynactin to the apical MT plus‐ends. Furthermore, biologically active GFP‐dynein travels on endosomes in retrograde and not in anterograde direction …
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