Characterization of plant XRCC1 and its interaction with proliferating cell nuclear antigen.
In plants, there are no DNA polymerase beta (Pol beta) and DNA ligase III (Lig3) genes. Thus, the plant short-patch base excision repair (short-patch BER) pathway must differ considerably from that in mammals. We characterized the rice (Oryza Sativa L. cv. Nipponbare) homologue of the mammalian X-ray repair cross complementing 1 (XRCC1), a well-known BER protein. The plant XRCC1 lacks the N-terminal domain (NTD) which is required for Pol beta binding and is essential for mammalian cell survival. The recombinant rice XRCC1 (OsXRCC1) protein binds single-stranded DNA (ssDNA) as well as double-stranded DNA (dsDNA) and also interacts with rice proliferating cell nuclear antigen (OsPCNA) in a pull-down assay. Through immunoprecipitation, we demonstrated that OsXRCC1 forms a complex with PCNA in vivo. OsXRCC1 mRNA was expressed in all rice organs and was induced by application of bleomycin, but not of MMS, H(2)O(2) or UV-B. Bleomycin also increased the fraction of OsXRCC1 associated with chromatin. These results suggest that OsXRCC1 contributes to DNA repair pathways that differ from the mammalian BER system.
Uchiyama
Yukinobu
Y
Department of Applied Biological Science, Tokyo University of Science, Chiba, 278-8510, Japan.
Suzuki
Yuko
Y
Sakaguchi
Kengo
K
D002470:Cell Survival; D002843:Chromatin / Q000235:genetics / Q000502:physiology; D003001:Cloning, Molecular; D004260:DNA Repair; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D012275:Oryza / Q000235:genetics / Q000254:growth & development / Q000378:metabolism; D018515:Plant Leaves / Q000378:metabolism; D010940:Plant Proteins / Q000378:metabolism*; D018520:Plant Shoots / Q000378:metabolism; D018809:Proliferating Cell Nuclear Antigen / Q000378:metabolism*; D011994:Recombinant Proteins / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013347:Subcellular Fractions / Q000378:metabolism; D000076105:X-ray Repair Cross Complementing Protein 1
D002843:Chromatin; D004268:DNA-Binding Proteins; D010940:Plant Proteins; D018809:Proliferating Cell Nuclear Antigen; D011994:Recombinant Proteins; D000076105:X-ray Repair Cross Complementing Protein 1