2hl9
SUMO protease Ulp1 with the catalytic cysteine oxidized to a sulfonic acid
Structural highlights
FunctionULP1_YEAST Protease that catalyzes two essential functions in the SUMO pathway: processing of full-length SMT3 to its mature form and deconjugation of SMT3 from targeted proteins. Has an essential role in the G2/M phase of the cell cycle.[1] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedSumoylation has emerged as an indispensable post-translational modification that modulates the functions of a broad spectrum of proteins. Recent studies have demonstrated that reactive oxygen species influence the equilibrium of sumoylation-desumoylation. We show herein that H2O2 induces formation of an intermolecular disulfide linkage of human SUMO protease SENP1 via the active-site Cys 603 and a unique residue Cys 613. Such reversible modification confers a higher recovery of enzyme activity, which is also observed in yeast Ulp1, but not in human SENP2, suggesting its protective role against irreversible sulfhydryl oxidation. In vivo formation of a disulfide-linked dimer of SENP1 is also detected in cultured cells in response to oxidative stress. The modifications are further elucidated by the crystal structures of Ulp1 with the catalytic cysteine oxidized to sulfenic, sulfinic, and sulfonic acids. Our findings suggest that, in addition to SUMO conjugating enzymes, SUMO proteases may act as redox sensors and effectors modulating the desumoylation pathway and specific cellular responses to oxidative stress. Molecular basis of the redox regulation of SUMO proteases: a protective mechanism of intermolecular disulfide linkage against irreversible sulfhydryl oxidation.,Xu Z, Lam LS, Lam LH, Chau SF, Ng TB, Au SW FASEB J. 2008 Jan;22(1):127-37. Epub 2007 Aug 17. PMID:17704192[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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