ESCRT-III on endosomes: new functions, new activation pathway.

ESCRT-III on endosomes: new functions, new activation pathway.
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内体上的 ESCRT-III:新功能,新激活途径。

DOI:
10.1042/bj20151115
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发表时间:
2016
期刊:
The Biochemical journal
影响因子:
--
通讯作者:
Woodman P
Woodman P
中科院分区:
--
文献类型:
--
作者:
Woodman P

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多泡体(MVB)途径将泛素化的膜货物分类到内体内的管腔内囊泡(ILV)中,途中到达溶酶体腔。该途径涉及保守蛋白质复合物[转运所需的内体分选复合物(ESCRT)]的顺序作用,最终通过ESCRT-II激活ESCRT-III(一种膜雕刻复合物)。尽管ESCRT激活的线性途径被广泛接受,但Luzio及其同事在最近一期《生物化学杂志》上的一项研究表明,ESCRT-III激活的复杂性更大,至少对一些MVB货物来说是如此。他们表明,主要组织相容性复合物(MHC)I类与MVB的泛素依赖性分选需要中央ESCRT-III复合物,但不涉及ESCRT-II或ESCRT-II和ESCRT-III之间的功能联系。相反,他们提出,MHC I类利用组氨酸结构域蛋白酪氨酸磷酸酶(HD-PTP),一种非典型的ESCRT相互作用,以促进ESCRT-III激活。
The multivesicular body (MVB) pathway sorts ubiquitinated membrane cargo to intraluminal vesicles (ILVs) within the endosome, en route to the lysosomal lumen. The pathway involves the sequential action of conserved protein complexes [endosomal sorting complexes required for transport (ESCRTs)], culminating in the activation by ESCRT-II of ESCRT-III, a membrane-sculpting complex. Although this linear pathway of ESCRT activation is widely accepted, a study by Luzio and colleagues in a recent issue of theBiochemical Journalsuggests that there is greater complexity in ESCRT-III activation, at least for some MVB cargoes. They show that ubiquitin-dependent sorting of major histocompatibility complex (MHC) class I to the MVB requires the central ESCRT-III complex but does not involve either ESCRT-II or functional links between ESCRT-II and ESCRT-III. Instead, they propose that MHC class I utilizes histidine-domain protein tyrosine phosphatase (HD-PTP), a non-canonical ESCRT interactor, to promote ESCRT-III activation.
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