title: Complex formation of double-stranded DNA (6-4) photoproducts and anti-(6-4) photoproduct antibody Fabs.
abstract: DNA (6-4) photoproducts are major constituents of ultraviolet-damaged DNAs. We prepared double-stranded (ds) (6-4) DNA photoproducts and analyzed formation of their complexes with anti-(6-4) photoproduct antibody Fabs. Elution profiles of the mixtures of ds-(6-4) DNAs and Fabs from anion-exchange and gel-filtration columns indicate that Fab 64M-2 deprives 14mer ds-(6-4) DNA of single-stranded (ss) (6-4) DNA and shows no interaction with 18 mer ds-(6-4) DNA (A18). Fab 64M-5 with an approximately 100-fold higher affinity than Fab 64M-2 forms a complex with the ds-(6-4) DNA (A18), but partly dissociates another 18 mer ds-(6-4) DNA (A18-3), with a lowered G-C content, into ss-DNAs. From these results, antibody 64M-5 possibly accommodates the T(6-4)T photolesion moiety of the ds-(6-4) DNA (A18) by flipping out the moiety from its neighboring segments.
authors.affiliation: Graduate School of Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yokoyama
authors.forename: R
authors.initials: R
authors.lastname: Mizutani
authors.forename: Y
authors.initials: Y
authors.lastname: Satow
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000737:chemistry / Q000302:isolation & purification; D001483:Base Sequence; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D004247:DNA / Q000737:chemistry / Q000276:immunology* / Q000302:isolation & purification / Q000528:radiation effects*; D004249:DNA Damage; D007140:Immunoglobulin Fab Fragments / Q000737:chemistry* / Q000302:isolation & purification; D066298:In Vitro Techniques; D051379:Mice; D010777:Photochemistry; D014466:Ultraviolet Rays
chemical_list: D000911:Antibodies, Monoclonal; D007140:Immunoglobulin Fab Fragments; D004247:DNA