Evidence for ESCRT- and clathrin-dependent microautophagy.

Evidence for ESCRT- and clathrin-dependent microautophagy.
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DOI:
10.1083/jcb.201611029
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发表时间:
2017-10-02
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Sakai Y
Sakai Y
中科院分区:
其他
文献类型:
--
作者:
Oku M;Maeda Y;Kagohashi Y;Kondo T;Yamada M;Fujimoto T;Sakai Y

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微自噬是一种自噬模式,其中溶酶体或空泡膜内陷并吞噬靶组分。Oku等人表明,在二次移位时,酵母微自噬涉及ESCRT蛋白向液泡膜的募集,包括网格蛋白相互作用Vps27,以及液泡对脂滴的摄取。微自噬是指溶酶体或空泡膜内陷并直接吞噬靶成分的自噬模式。驱动微自噬的膜动力学的分子机制仍然是难以捉摸的。使用免疫化学监测的酵母液泡跨膜蛋白,Vph1和Pho8,融合到荧光蛋白,我们得到的证据表明,诱导微自噬后,在酵母酿酒酵母中的双辅基移位。内体分选复合物所需的运输机械的组件被认为是需要这个过程中,和网关蛋白的机器,Vps27,观察到改变其定位到液泡膜后,diauxic移位。我们揭示了Vps 27在这种微自噬中与网格蛋白相互作用的功能重要性,这也有助于脂滴摄入液泡。这项研究揭示了微自噬的分子机制,它不需要核心Atg蛋白。
Microautophagy is a mode of autophagy in which the lysosomal or vacuolar membrane invaginates and engulfs target components. Oku et al. show that, upon a diauxic shift, yeast microautophagy involves recruitment of ESCRT proteins to the vacuolar membrane, including clathrin-interacting Vps27, and uptake of lipid droplets by the vacuole. Microautophagy refers to a mode of autophagy in which the lysosomal or vacuolar membrane invaginates and directly engulfs target components. The molecular machinery of membrane dynamics driving microautophagy is still elusive. Using immunochemical monitoring of yeast vacuolar transmembrane proteins, Vph1 and Pho8, fused to fluorescent proteins, we obtained evidence showing an induction of microautophagy after a diauxic shift in the yeast Saccharomyces cerevisiae. Components of the endosomal sorting complex required for transport machinery were found to be required for this process, and the gateway protein of the machinery, Vps27, was observed to change its localization onto the vacuolar membrane after a diauxic shift. We revealed the functional importance of Vps27’s interaction with clathrin in this microautophagy that also contributed to uptake of lipid droplets into the vacuole. This study sheds light on the molecular mechanism of microautophagy, which does not require the core Atg proteins.
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