Insights into ubiquitin transfer cascades from a structure of a UbcH5B approximately ubiquitin-HECT(NEDD4L) complex.

Insights into ubiquitin transfer cascades from a structure of a UbcH5B approximately ubiquitin-HECT(NEDD4L) complex.
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DOI:
10.1016/j.molcel.2009.11.010
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发表时间:
2009-12-25
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:
Kamadurai, Hari B.;Souphron, Judith;Scott, Daniel C.;Duda, David M.;Miller, Darcie J.;Stringer, Daniel;Piper, Robert C.;Schulman, Brenda A.

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在E1-E2-E3泛素(Ub)缀合级联反应中,E2首先形成瞬时的E2~Ub共价复合物,然后与E3相互作用以转移Ub。对于涉及HECT类E3s的级联,Ub从相关E2转移到HECT结构域c叶的受体Cys。为了深入了解这一过程,我们确定了NEDD4L的HECT结构域和E2 UbcH5B之间的一个配合物的晶体结构,该配合物在其活性位点(UbcH5B~Ub)上带有共价连接的Ub。UbcH5B与HECT N-lobe之间以及Ub与HECT结构域C-lobe之间的非共价相互作用导致UbcH5B整体结构紧凑,Ubc -末端夹在UbcH5B和HECT结构域活性位点之间。该结构提示了e2到hect的Ub转移模型,其中供体Ub和受体结构域之间的相互作用限制了上游和下游酶的结合。
In E1-E2-E3 ubiquitin (Ub) conjugation cascades, the E2 first forms a transient E2~Ub covalent complex, and then interacts with an E3 for Ub transfer. For cascades involving E3s in the HECT class, Ub is transferred from an associated E2 to the acceptor Cys in the HECT domain C-lobe. To gain insights into this process, we determined the crystal structure of a complex between the HECT domain of NEDD4L and the E2 UbcH5B bearing a covalently-linked Ub at its active site (UbcH5B~Ub). Noncovalent interactions between UbcH5B and the HECT N-lobe and between Ub and the HECT domain C-lobe lead to an overall compact structure, with the Ub C-terminus sandwiched between UbcH5B and HECT domain active sites. The structure suggests a model for E2-to-HECT Ub transfer, in which interactions between a donor Ub and an acceptor domain constrain upstream and downstream enzymes for conjugation.
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