We have discovered a ubiquitin (Ub)-specific cysteine protease encoded within the N-terminal approximately 500 residues of the UL36 gene product, the largest (3164 aa) tegument protein of herpes simplex virus 1 (HSV-1). Enzymatic activity of this fragment, UL36USP, is detectable only after cleavage of UL36USP from full-length UL36 and occurs late during viral replication. UL36USP bears no homology to known deubiquitinating enzymes (DUBs) or Ub binding proteins. Sequence alignment of the large...Expand abstract
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A deubiquitinating enzyme encoded by HSV-1 belongs to a family of cysteine proteases that is conserved across the family Herpesviridae.
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