title: Saccharomyces cerevisiae Cmr1 protein preferentially binds to UV-damaged DNA in vitro.
abstract: DNA metabolic processes such as DNA replication, recombination, and repair are fundamentally important for the maintenance of genome integrity and cell viability. Although a large number of proteins involved in these pathways have been extensively studied, many proteins still remain to be identified. In this study, we isolated DNA-binding proteins from Saccharomyces cerevisiae using DNA-cellulose columns. By analyzing the proteins using mass spectrometry, an uncharacterized protein, Cmr1/YDL156W, was identified. Cmr1 showed sequence homology to human Damaged-DNA binding protein 2 in its C-terminal WD40 repeats. Consistent with this finding, the purified recombinant Cmr1 protein was found to be intrinsically associated with DNA-binding activity and exhibited higher affinity to UV-damaged DNA substrates. Chromatin isolation experiments revealed that Cmr1 localized in both the chromatin and supernatant fractions, and the level of Cmr1 in the chromatin fraction increased when yeast cells were irradiated with UV. These results suggest that Cmr1 may be involved in DNA-damage responses in yeast.
authors.affiliation: Department of Biological Sciences, College of Natural Science, Inha University, Incheon, 402-751, Republic of Korea.
authors.forename: Do-Hee
authors.initials: DH
authors.lastname: Choi
authors.forename: Sung-Hun
authors.initials: SH
authors.lastname: Kwon
authors.forename: Joon-Ho
authors.initials: JH
authors.lastname: Kim
authors.forename: Sung-Ho
authors.initials: SH
authors.lastname: Bae
mesh_terms: D000595:Amino Acid Sequence; D047369:Chromatin Immunoprecipitation; D004249:DNA Damage / Q000528:radiation effects*; D004260:DNA Repair; D004271:DNA, Fungal / Q000378:metabolism* / Q000528:radiation effects*; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000378:metabolism*; D024202:Electrophoretic Mobility Shift Assay; D008969:Molecular Sequence Data; D011485:Protein Binding; D012441:Saccharomyces cerevisiae / Q000378:metabolism* / Q000528:radiation effects*; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry / Q000378:metabolism*; D017386:Sequence Homology, Amino Acid; D014466:Ultraviolet Rays
chemical_list: C573119:Cmr1 protein, S cerevisiae; D004271:DNA, Fungal; D004268:DNA-Binding Proteins; D029701:Saccharomyces cerevisiae Proteins