WNK1 is an assembly factor for the human ER membrane protein complex.

WNK1 is an assembly factor for the human ER membrane protein complex.
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DOI:
10.1016/j.molcel.2021.04.013
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发表时间:
2021-07-01
期刊:
影响因子:
16
通讯作者:
Voorhees RM
Voorhees RM
中科院分区:
生物学1区
文献类型:
--
作者:
Pleiner T;Hazu M;Tomaleri GP;Januszyk K;Oania RS;Sweredoski MJ;Moradian A;Guna A;Voorhees RM

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The assembly of nascent proteins into multi-subunit complexes is a tightly regulated process which must occur at high fidelity to maintain cellular homeostasis. The ER membrane protein complex (EMC) is an essential insertase that requires seven membrane-spanning and two soluble cytosolic subunits for function. Here we show that the kinase With no lysine 1 (WNK1), known for its role in hypertension and neuropathy, functions as an assembly factor for the human EMC. WNK1 uses a conserved amphipathic helix to stabilize the soluble subunit, EMC2, by binding to the EMC2-8 interface. Shielding this hydrophobic surface prevents promiscuous interactions of unassembled EMC2 and directly competes for binding of E3 ubiquitin ligases, permitting assembly. Depletion of WNK1 thus destabilizes both the EMC and its membrane protein clients. This work describes an unexpected role for WNK1 in protein biogenesis and defines the general requirements of an assembly factor that will apply across the proteome. Assembly of multisubunit complexes is tightly regulated. The ER membrane protein complex (EMC) is an essential, nine-subunit membrane protein insertase. Pleiner et al. find that the kinase, WNK1, is an assembly factor for the human EMC. WNK1 depletion perturbs EMC assembly and affects the biogenesis of its membrane protein clients.
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