SUMO protease Ulp1 with the catalytic cysteine oxidized to a sulfinic acid

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.192 

Starting Model: experimental
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Molecular basis of the redox regulation of SUMO proteases: a protective mechanism of intermolecular disulfide linkage against irreversible sulfhydryl oxidation

Xu, Z.Lam, L.S.M.Lam, L.H.Chau, S.F.Ng, T.B.Au, S.W.N.

(2008) FASEB J 22: 127-137

  • DOI: https://doi.org/10.1096/fj.06-7871com
  • Primary Citation of Related Structures:  
    2HKP, 2HL8, 2HL9

  • PubMed Abstract: 

    Sumoylation 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.

  • Organizational Affiliation

    Centre of Protein Science and Crystallography, Department of Biochemistry, Faculty of Science, The Chinese University of Hong Kong, Hong Kong.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ubiquitin-like-specific protease 1221Saccharomyces cerevisiaeMutation(s): 0 
EC: 3.4.22
Find proteins for Q02724 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q02724 
Go to UniProtKB:  Q02724
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ02724
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on CSD
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.192 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.936α = 90
b = 40.189β = 112
c = 55.371γ = 90
Software Package:
Software NamePurpose
d*TREKdata scaling
PDB_EXTRACTdata extraction
CrystalCleardata reduction
CrystalCleardata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-07-31
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-11-12
    Changes: Other
  • Version 1.3: 2023-10-25
    Changes: Data collection, Database references, Derived calculations, Refinement description