Syntaxin 13, a genetic modifier of mutant CHMP2B in frontotemporal dementia, is required for autophagosome maturation.

Syntaxin 13, a genetic modifier of mutant CHMP2B in frontotemporal dementia, is required for autophagosome maturation.
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DOI:
10.1016/j.molcel.2013.08.041
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发表时间:
2013-10-24
期刊:
影响因子:
16
通讯作者:
Gao, Fen-Biao
Gao, Fen-Biao
中科院分区:
生物学1区
文献类型:
--
作者:
Lu, Yubing;Zhang, Zhijun;Sun, Danqiong;Sweeney, Sean T.;Gao, Fen-Biao

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噬菌体成熟是巨噬细胞自噬过程中的关键步骤,在许多重要的生理和病理过程中起着至关重要的作用。在这里,我们发现果蝇N-乙基马来酰亚胺敏感融合蛋白2(DNSF2)和可溶性NSF附着蛋白(Snap)是突变的CHMP2B引起的毒性的强烈遗传修饰物,CHMP2B是ESCRT-III的一种成分,会导致额颞痴呆和自噬小体积累。在几个SNAR基因中,果蝇合成素13(Syx13)与突变体CHMP2B表现出较强的遗传互作。在哺乳动物细胞中敲除Synaxin 13(STX13)或其结合伙伴Vti1a导致Lc3阳性斑点积累并阻断自噬通量。STX13存在于雷帕霉素诱导的LC3阳性噬菌体上,而在功能失调的ESCRT-III诱导的多层结构中高度富含。STX13的缺失还导致ATG5阳性斑点的聚集和多层结构的形成。这些结果表明,STX13是ESCRT-III功能障碍的遗传修饰者,并参与了吞噬细胞成熟为封闭自噬小体的过程。
Phagophore maturation is a key step in the macroautophagy pathway, which is critical in many important physiological and pathological processes. Here we identified Drosophila N-ethylmaleimide-sensitive fusion protein 2 (dNSF2) and soluble NSF attachment protein (Snap) as strong genetic modifiers of toxicity caused by mutant CHMP2B, an ESCRT-III component that causes frontotemporal dementia and autophagosome accumulation. Among several SNARE genes, Drosophila syntaxin 13 (syx13) exhibited a strong genetic interaction with mutant CHMP2B. Knockdown of syntaxin 13 (STX13) or its binding partner Vti1a in mammalian cells caused LC3-positive puncta to accumulate and blocks autophagic flux. STX13 was present on LC3-positive phagophores induced by rapamycin and was highly enriched on multilamellar structures induced by dysfunctional ESCRT-III. Loss of STX13 also caused the accumulation of Atg5-positive puncta and the formation of multilamellar structures. These results suggest STX13 is a genetic modifier of ESCRT-III dysfunction and participates in the maturation of phagophores into closed autophagosomes.
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