title: Characterization of four RecQ homologues from rice (Oryza sativa L. cv. Nipponbare).
abstract: The RecQ family of DNA helicases is conserved throughout the biological kingdoms. In this report, we have characterized four RecQ homologues clearly expressed in rice. OsRecQ1, OsRecQ886, and OsRecQsim expressions were strongly detected in meristematic tissues. Transcription of the OsRecQ homologues was differentially induced by several types of DNA-damaging agents. The expression of four OsRecQ homologues was induced by MMS and bleomycin. OsRecQ1 and OsRecQ886 were induced by H(2)O(2), and MitomycinC strongly induced the expression of OsRecQ1. Transient expression of OsRecQ/GFP fusion proteins demonstrated that OsRecQ2 and OsRecQ886 are found in nuclei, whereas OsRecQ1 and OsRecQsim are found in plastids. Neither OsRecQ1 nor OsRecQsim are induced by light. These results indicate that four of the RecQ homologues have different and specific functions in DNA repair pathways, and that OsRecQ1 and OsRecQsim may not involve in plastid differentiation but different aspects of a plastid-specific DNA repair system.
authors.affiliation: Department of Applied Biological Science, Faculty of Science and Technology, Tokyo University of Science, Noda-shi, Chiba-ken, Japan.
authors.forename: Ai
authors.initials: A
authors.lastname: Saotome
authors.forename: Seisuke
authors.initials: S
authors.lastname: Kimura
authors.forename: Yoko
authors.initials: Y
authors.lastname: Mori
authors.forename: Yukinobu
authors.initials: Y
authors.lastname: Uchiyama
authors.forename: Kengo
authors.initials: K
authors.lastname: Morohashi
authors.forename: Kengo
authors.initials: K
authors.lastname: Sakaguchi
mesh_terms: D000251:Adenosine Triphosphatases / Q000235:genetics* / Q000378:metabolism; D000595:Amino Acid Sequence; D001761:Bleomycin / Q000633:toxicity; D003001:Cloning, Molecular; D004249:DNA Damage; D004265:DNA Helicases / Q000235:genetics* / Q000378:metabolism; D004260:DNA Repair; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects / Q000528:radiation effects; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects / Q000528:radiation effects; D018506:Gene Expression Regulation, Plant / Q000187:drug effects / Q000528:radiation effects; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000633:toxicity; D017403:In Situ Hybridization; D007527:Isoenzymes / Q000235:genetics / Q000378:metabolism; D008741:Methyl Methanesulfonate / Q000633:toxicity; D008856:Microscopy, Fluorescence; D008969:Molecular Sequence Data; D012275:Oryza / Q000201:enzymology / Q000235:genetics* / Q000254:growth & development; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D053484:RecQ Helicases; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
chemical_list: D007527:Isoenzymes; D010940:Plant Proteins; D001761:Bleomycin; D049452:Green Fluorescent Proteins; D008741:Methyl Methanesulfonate; D006861:Hydrogen Peroxide; D000251:Adenosine Triphosphatases; D004265:DNA Helicases; D053484:RecQ Helicases