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Background  The error-free branch of the DNA-damage tolerance (DDT) pathway is orchestrated by Lys63-linked polyubiquitination of proliferating cell nuclear antigen (PCNA), and this polyubiquitination is mediated by a Ubc13-Uev complex in yeast. We have previously cloned  OsUBC13  from rice, whose product functions as an E2 to promote Lys63-linked ubiquitin chain assembly in the presence of yeast or human Uev.    Results  Here we identify four highly conserved  UEV1  genes in rice whose products are able to form stable heterodimers with OsUbc13 and mediate Lys63-linked ubiquitin chain assembly. Expression of  OsUEV1 s is able to rescue the yeast  mms2  mutant from death caused by DNA-damaging agents. Interestingly, OsUev1A contains a unique C-terminal tail with a conserved prenylation site not found in the other three OsUev1s, and this post-translational modification appears to be required for its unique subcellular distribution and association with the membrane. The analysis of  OsUEV1  expression profiles obtained from the Genevestigator database indicates that these genes are differentially regulated.    Conclusions  We speculate that different OsUev1s play distinct roles by serving as a regulatory subunit of the Ubc13-Uev1 complex to respond to diverse cellular, developmental and environmental signals.

Characterization of four rice UEV1 genes required for Lys63-linked polyubiquitination and distinct functions