Abstract
In order to extend the understanding of the genetical and biochemical basis of photo-activated psoralen-induced DNA repair in the yeast Saccharomyces cerevisiae we have identified and cloned 10 pso mutants. Here, we describe the phenotypic characterization and molecular cloning of the pso10-1 mutant which is highly sensitive to photoactivated psoralens, UV254 nm radiation and the alkylating agent methylmethane sulphonate. The pso10-1 mutant allele also confers a block in the mutagenic response to photoactivated psoralens and UV254 nm radiation, and homoallelic diploids do not sporulate. Molecular cloning using a yeast genomic library, sequence analysis and genetic complementation experiments proved pso10-1 to be a mutant allele of gene MMS21 that encodes a SUMO ligase involved in the sumoylation of several DNA repair proteins. The ORF of pso10-1 contains a single nucleotide C→T transition at position 758, which leads to a change in amino acid sequence from serine to phenylalanine [S253F]. Pso10-1p defines a leaky mutant phenotype of the essential MMS21 gene, and as member of the Smc5-Smc6 complex, still has some essential functions that allow survival of the mutant. DNA repair via translesion synthesis is severely impaired as the pso10-1 mutant allele confers severely blocked induced forward and reverse mutagenesis and shows epistatic interaction with a rev3Δ mutant allele. By identifying the allelism of PSO10 and MMS21 we demonstrate the need of a fully functional Smc5-Smc6 complex for a WT-like adequate repair of photoactivated psoralen-induced DNA damage in yeast.
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Acknowledgments
We thank Dr. Martin Schmidt for kindly providing us the yeast genomic library used in this work, and Dr. Giancarlo Pasquali for sequencing support. Research was supported by CNPq, CAPES and Genotox-Laboratório de Genotoxicidade-Instituto Royal. M.Brendel is a Visiting Scientist supported by Fundação de Amparo a Pesquisa do Estado da Bahia (FAPESB).
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Communicated by P. Sunnerhagen.
N. C. Hoch and R. S. Santos contributed equally to this work.
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Hoch, N.C., Santos, R.S., Rosa, R.M. et al. Allelism of Saccharomyces cerevisiae gene PSO10, involved in error-prone repair of psoralen-induced DNA damage, with SUMO ligase-encoding MMS21 . Curr Genet 53, 361–371 (2008). https://doi.org/10.1007/s00294-008-0192-z
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DOI: https://doi.org/10.1007/s00294-008-0192-z