Structural basis for RING-Cys-Relay E3 ligase activity and its role in axon integrity.

Structural basis for RING-Cys-Relay E3 ligase activity and its role in axon integrity.
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DOI:
10.1038/s41589-020-0598-6
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发表时间:
2020-11
影响因子:
14.8
通讯作者:
Virdee S
Virdee S
中科院分区:
生物学1区
文献类型:
--
作者:
Mabbitt PD;Loreto A;Déry MA;Fletcher AJ;Stanley M;Pao KC;Wood NT;Coleman MP;Virdee S

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MYCBP 2是一种泛素(Ub)E3连接酶(E3),对神经发育至关重要,并调节轴突的维持。MYCBP 2通过新发现的RING-Cys-Relay(RCR)机制将Ub转移到非赖氨酸底物,其中Ub从上游半胱氨酸中继到下游底物酯化位点。E2-E3 Ub转移和Ub中继的分子基础尚不清楚。这些活动是否与神经表型有关也尚不清楚。我们描述了共价捕获的E2-Ub:MYCBP 2转移中间体的晶体结构,揭示了E2-E3 Ub转移和Ub中继后的关键结构重排。我们的数据表明,转移到动态上游半胱氨酸,同时减轻赖氨酸活性,需要一个封闭的样E2-Ub共轭与回火的反应性,和Ub中继是由螺旋线圈过渡促进。此外,在RCR缺陷敲入小鼠中的神经发育缺陷和延迟损伤诱导的变性表明其要求,以及底物酯化活性,用于正常神经发育和程序性轴突变性。
MYCBP2 is a ubiquitin (Ub) E3 ligase (E3) that is essential for neurodevelopment and regulates axon maintenance. MYCBP2 transfers Ub to non-lysine substrates via a newly discovered RING-Cys-Relay (RCR) mechanism where Ub is relayed from an upstream cysteine to a downstream substrate esterification site. The molecular bases for E2-E3 Ub transfer and Ub relay are unknown. Whether these activities are linked to the neural phenotypes is also unclear. We describe the crystal structure of a covalently trapped E2-Ub:MYCBP2 transfer intermediate revealing key structural rearrangements upon E2-E3 Ub transfer and Ub relay. Our data suggest that transfer to the dynamic upstream cysteine, whilst mitigating lysine activity, requires a closed-like E2-Ub conjugate with tempered reactivity, and Ub relay is facilitated by a helix-coil transition. Furthermore, neurodevelopmental defects and delayed injury-induced degeneration in RCR-defective knock-in mice suggest its requirement, and that of substrate esterification activity, for normal neural development and programmed axon degeneration.
DOI: 10.1038/s41583-020-0269-3
发表时间: 2020-04
期刊: Nature reviews. Neuroscience
影响因子: --
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