Mechanism of polyubiquitination by human anaphase-promoting complex: RING repurposing for ubiquitin chain assembly.

Mechanism of polyubiquitination by human anaphase-promoting complex: RING repurposing for ubiquitin chain assembly.
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DOI:
10.1016/j.molcel.2014.09.009
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发表时间:
2014-10-23
期刊:
影响因子:
16
通讯作者:
Schulman, Brenda A.
Schulman, Brenda A.
中科院分区:
生物学1区
文献类型:
--
作者:
Brown, Nicholas G.;Watson, Edmond R.;Weissmann, Florian;Jarvis, Marc A.;VanderLinden, Ryan;Grace, Christy R. R.;Frye, Jeremiah J.;Qiao, Renping;Dube, Prakash;Petzold, Georg;Cho, Shein Ei;Alsharif, Omar;Bao, Ju;Davidson, Iain F.;Zheng, Jie J.;Nourse, Amanda;Kurinov, Igor;Peters, Jan-Michael;Stark, Holger;Schulman, Brenda A.

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Polyubiquitination by E2 and E3 enzymes is a predominant mechanism regulating protein function. Some RING E3s, including Anaphase Promoting Complex/Cyclosome (APC), catalyze polyubiquitination by sequential reactions with two different E2s. An initiating E2 ligates ubiquitin to an E3-bound substrate. Another E2 grows a polyubiquitin chain on the ubiquitin-primed substrate through poorly defined mechanisms. Here we show that human APC’s RING domain is repurposed for dual functions in polyubiquitination. The canonical RING surface activates an initiating E2~ubiquitin intermediate for substrate modification. However, APC engages and activates its specialized ubiquitin chain elongating E2 UBE2S in ways that differ completely from current paradigms. During chain assembly, a distinct APC11 RING surface helps deliver a substrate-linked ubiquitin to accept another ubiquitin from UBE2S. Our data define mechanisms of APC/UBE2S-mediated polyubiquitination, reveal unexpectedly diverse functions of RING E3s and E2s, and provide a framework for understanding distinctive RING E3 features specifying ubiquitin chain elongation.
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