Enhanced protein degradation by branched ubiquitin chains.

Enhanced protein degradation by branched ubiquitin chains.
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DOI:
10.1016/j.cell.2014.03.037
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发表时间:
2014-05-08
期刊:
影响因子:
64.5
通讯作者:
Rape M
Rape M
中科院分区:
生物学1区
文献类型:
--
作者:
Meyer HJ;Rape M

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Posttranslational modification of cell cycle regulators with ubiquitin chains is essential for eukaryotic cell division. Such chains can be connected through seven lysine residues or the amino-terminus of ubiquitin, thereby allowing the assembly of eight homogenous and multiple mixed or branched conjugates. While functions of homogenous chain types have been described, physiological roles of branched structures are unknown. Here, we report that the anaphase-promoting complex (APC/C) efficiently synthesizes branched conjugates that contain multiple blocks of K11-linked chains. Compared to homogenous chains, the branched conjugates assembled by the APC/C strongly enhance substrate recognition by the proteasome, thereby driving the degradation of cell cycle regulators during early mitosis. Our work, therefore, identifies an enzyme and substrates for modification with branched ubiquitin chains and points to an important role of these conjugates in providing an improved signal for proteasomal degradation.
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