The yeast Alix homolog Bro1 functions as a ubiquitin receptor for protein sorting into multivesicular endosomes.

The yeast Alix homolog Bro1 functions as a ubiquitin receptor for protein sorting into multivesicular endosomes.
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DOI:
10.1016/j.devcel.2013.04.007
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发表时间:
2013-06-10
期刊:
影响因子:
11.8
通讯作者:
Piper, Robert C.
Piper, Robert C.
中科院分区:
生物学1区
文献类型:
--
作者:
Pashkova, Natasha;Gakhar, Lokesh;Winistorfer, Stanley C.;Sunshine, Anna B.;Rich, Matthew;Dunham, Maitreya J.;Yu, Liping;Piper, Robert C.

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泛素化的膜蛋白通过ESCRT装置和辅助蛋白(如Bro1)将泛素化的膜蛋白分选到多囊泡体的腔小泡中,Bro1等辅助蛋白招募脱泛素化酶Doa4来从货物中去除泛素。在这里,我们认为Bro1作为泛素化货物选择性分选的受体。我们发现了BRO1和ESCRT-0之间的人工遗传交互作用,这表明Bro1的功能类似于ESCRT-0。多种结构研究表明,Bro1通过其中间V结构域的N-末端三螺旋臂与泛素结合。缺乏结合Ub能力的Bro1突变体对Ub-Cargo膜蛋白的分类能力显著减弱,但只有在与ESCRT-0的亚型等位基因结合时才会如此。这些数据表明,Bro1和其他Bro1家族成员与ESCRT-0平行发挥识别和分类Ub-Cargo的功能。
Sorting of ubiquitinated membrane proteins into lumenal vesicles of multivesicular bodies is mediated by the ESCRT apparatus and accessory proteins such as Bro1, which recruits the deubiquitinating enzyme Doa4 to remove ubiquitin from cargo. Here we propose that Bro1 works as a receptor for the selective sorting of ubiquitinated cargos. We found synthetic genetic interactions between BRO1 and ESCRT-0, suggesting Bro1 functions similarly to ESCRT-0. Multiple structural approaches demonstrated that Bro1 binds ubiquitin via the N-terminal trihelical arm of its middle V domain. Mutants of Bro1 that lack the ability to bind Ub were dramatically impaired in their ability to sort Ub-cargo membrane proteins, but only when combined with hypomorphic alleles of ESCRT-0. These data suggest that Bro1 and other Bro1 family members function in parallel with ESCRT-0 to recognize and sort Ub-cargos.
DOI: 10.1083/jcb.201110031
发表时间: 2012-04-30
期刊: The Journal of cell biology
影响因子: --
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