Wss1 metalloprotease partners with Cdc48/Doa1 in processing genotoxic SUMO conjugates

ELife
Maxim Y BalakirevKeith D Wilkinson

Abstract

Sumoylation during genotoxic stress regulates the composition of DNA repair complexes. The yeast metalloprotease Wss1 clears chromatin-bound sumoylated proteins. Wss1 and its mammalian analog, DVC1/Spartan, belong to minigluzincins family of proteases. Wss1 proteolytic activity is regulated by a cysteine switch mechanism activated by chemical stress and/or DNA binding. Wss1 is required for cell survival following UV irradiation, the smt3-331 mutation and Camptothecin-induced formation of covalent topoisomerase 1 complexes (Top1cc). Wss1 forms a SUMO-specific ternary complex with the AAA ATPase Cdc48 and an adaptor, Doa1. Upon DNA damage Wss1/Cdc48/Doa1 is recruited to sumoylated targets and catalyzes SUMO chain extension through a newly recognized SUMO ligase activity. Activation of Wss1 results in metalloprotease self-cleavage and proteolysis of associated proteins. In cells lacking Tdp1, clearance of topoisomerase covalent complexes becomes SUMO and Wss1-dependent. Upon genotoxic stress, Wss1 is vacuolar, suggesting a link between genotoxic stress and autophagy involving the Doa1 adapter.

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Methods Mentioned

BETA
pull down
pull-down
pull-downs
protein folding
electrophoresis
sumoylation
immunoprecipitation
NMR
fluorescence microscopy
FACS

Software Mentioned

Adobe Photoshop
SYMPRED
SEQUEST
TALOS
PatchDock
Cytoscape
STRING
Spartan
CYANA
Phyre2

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