Requirement of Nse1, a Subunit of the Smc5-Smc6 Complex, for Rad52-Dependent Postreplication Repair of UV-Damaged DNA in Saccharomyces cerevisiae

Author:

Santa Maria Sergio R.1,Gangavarapu Venkateswarlu1,Johnson Robert E.1,Prakash Louise1,Prakash Satya1

Affiliation:

1. Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, Texas 77555-1061

Abstract

ABSTRACT In Saccharomyces cerevisiae , postreplication repair (PRR) of UV-damaged DNA occurs by a Rad6-Rad18- and an Mms2-Ubc13-Rad5-dependent pathway or by a Rad52-dependent pathway. The Rad5 DNA helicase activity is specialized for promoting replication fork regression and template switching; previously, we suggested a role for the Rad5-dependent PRR pathway when the lesion is located on the leading strand and a role for the Rad52 pathway when the lesion is located on the lagging strand. In this study, we present evidence for the requirement of Nse1, a subunit of the Smc5-Smc6 complex, in Rad52-dependent PRR, and our genetic analyses suggest a role for the Nse1 and Mms21 E3 ligase activities associated with this complex in this repair mode. We discuss the possible ways by which the Smc5-Smc6 complex, including its associated ubiquitin ligase and SUMO ligase activities, might contribute to the Rad52-dependent nonrecombinational and recombinational modes of PRR.

Publisher

American Society for Microbiology

Subject

Cell Biology,Molecular Biology

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