title: Interaction of nucleotide excision repair factors XPC-HR23B, XPA, and RPA with damaged DNA.
abstract: The interaction of nucleotide excision repair factors--xeroderma pigmentosum complementation group C protein in complex with human homolog of yeast Rad23 protein (XPC-HR23B), replication protein A (RPA), and xeroderma pigmentosum complementation group A protein (XPA)--with 48-mer DNA duplexes imitating damaged DNA structures was investigated. All studied proteins demonstrated low specificity in binding to damaged DNA compared with undamaged DNA duplexes. RPA stimulates formation of XPC-HR23B complex with DNA, and when XPA and XPC-HR23B are simultaneously present in the reaction mixture a synergistic effect in binding of these proteins to DNA is observed. RPA crosslinks to DNA bearing photoreactive 5I-dUMP residue on one strand and fluorescein-substituted dUMP analog as a lesion in the opposite strand of DNA duplex and also stimulates cross-linking with XPC-HR23B. Therefore, RPA might be one of the main regulation factors at various stages of nucleotide excision repair. The data are in agreement with the cooperative binding model of nucleotide excision repair factors participating in pre-incision complex formation with DNA duplexes bearing damages.
authors.affiliation: Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia.
authors.forename: Yu S
authors.initials: YS
authors.lastname: Krasikova
authors.forename: N I
authors.initials: NI
authors.lastname: Rechkunova
authors.forename: E A
authors.initials: EA
authors.lastname: Maltseva
authors.forename: I O
authors.initials: IO
authors.lastname: Petruseva
authors.forename: V N
authors.initials: VN
authors.lastname: Silnikov
authors.forename: T S
authors.initials: TS
authors.lastname: Zatsepin
authors.forename: T S
authors.initials: TS
authors.lastname: Oretskaya
authors.forename: O D
authors.initials: OD
authors.lastname: Schärer
authors.forename: O I
authors.initials: OI
authors.lastname: Lavrik
mesh_terms: D001483:Base Sequence; D004247:DNA / Q000235:genetics / Q000378:metabolism* / Q000528:radiation effects; D004249:DNA Damage; D004260:DNA Repair; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D003856:Deoxyuracil Nucleotides / Q000737:chemistry / Q000378:metabolism; D005468:Fluorodeoxyuridylate / Q000737:chemistry / Q000378:metabolism; D006801:Humans; D008027:Light; D046911:Macromolecular Substances / Q000378:metabolism / Q000528:radiation effects; D008969:Molecular Sequence Data; D015394:Molecular Structure; D051716:Replication Protein A / Q000235:genetics / Q000378:metabolism*; D016415:Sequence Alignment; D051760:Xeroderma Pigmentosum Group A Protein / Q000235:genetics / Q000378:metabolism*
chemical_list: D004268:DNA-Binding Proteins; D003856:Deoxyuracil Nucleotides; D046911:Macromolecular Substances; C497167:RPA1 protein, human; D051716:Replication Protein A; C497314:XPA protein, human; D051760:Xeroderma Pigmentosum Group A Protein; D005468:Fluorodeoxyuridylate; C086984:XPC protein, human; C056075:iododeoxyuridylate; D004247:DNA