Actin polymerization driven by WASH causes V-ATPase retrieval and vesicle neutralization before exocytosis.
Actin polymerization driven by WASH causes V-ATPase retrieval and vesicle neutralization before exocytosis.
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WASH 驱动的肌动蛋白聚合导致 V-ATP 酶修复和胞吐前囊泡中和。
DOI:
10.1083/jcb.201009119
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发表时间:
2011-05-30
期刊:
影响因子:
--
通讯作者:
Insall RH
中科院分区:
文献类型:
--
作者:
Carnell M;Zech T;Calaminus SD;Ura S;Hagedorn M;Johnston SA;May RC;Soldati T;Machesky LM;Insall RH
WASH coats mature lysosomes and is required for exocytosis of indigestible material. WASP and SCAR homologue (WASH) is a recently identified and evolutionarily conserved regulator of actin polymerization. In this paper, we show that WASH coats mature Dictyostelium discoideum lysosomes and is essential for exocytosis of indigestible material. A related process, the expulsion of the lethal endosomal pathogen Cryptococcus neoformans from mammalian macrophages, also uses WASH-coated vesicles, and cells expressing dominant negative WASH mutants inefficiently expel C. neoformans. D. discoideum WASH causes filamentous actin (F-actin) patches to form on lysosomes, leading to the removal of vacuolar adenosine triphosphatase (V-ATPase) and the neutralization of lysosomes to form postlysosomes. Without WASH, no patches or coats are formed, neutral postlysosomes are not seen, and indigestible material such as dextran is not exocytosed. Similar results occur when actin polymerization is blocked with latrunculin. V-ATPases are known to bind avidly to F-actin. Our data imply a new mechanism, actin-mediated sorting, in which WASH and the Arp2/3 complex polymerize actin on vesicles to drive the separation and recycling of proteins such as the V-ATPase.
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