title: Chemical cross-linking of MvaI and EcoRII enzymes to DNA duplexes containing monosubstituted pyrophosphate internucleotide bond.
abstract: DNA duplexes containing a monosubstituted pyrophosphate internucleotide group, instead of a phosphodiester bond, were used as cross-linking reagent for the affinity modification of the restriction endonucleases EcoRII and MvaI (R.EcoRII and R.MvaI). An active group was introduced into the enzyme's recognition site or between the recognition site and flanking sequence. The substrate properties of such DNA duplexes were determined. Cross-linking specificity was demonstrated by competition experiments with unmodified substrate, as well as by the absence of cross-linking to an active duplex lacking a recognition site. It was shown that the nucleophilicity of the buffer solution and the presence of the enzyme cofactor Mg2+ dramatically affected the cross-linking yield.
authors.affiliation: A.N. Belozersky Institute of Physical and Chemical Biology, Moscow State University, Russia.
authors.lastname: Sheflyan GYa
authors.forename: E A
authors.initials: EA
authors.lastname: Kubareva
authors.forename: E M
authors.initials: EM
authors.lastname: Volkov
authors.forename: T S
authors.initials: TS
authors.lastname: Oretskaya
authors.forename: E S
authors.initials: ES
authors.lastname: Gromova
authors.forename: Z A
authors.initials: ZA
authors.lastname: Shabarova
mesh_terms: D001483:Base Sequence; D001665:Binding Sites; D003432:Cross-Linking Reagents; D004247:DNA / Q000737:chemistry* / Q000378:metabolism*; D015252:Deoxyribonucleases, Type II Site-Specific / Q000378:metabolism*; D011756:Diphosphates; D007700:Kinetics; D008969:Molecular Sequence Data; D009838:Oligodeoxyribonucleotides / Q000138:chemical synthesis / Q000737:chemistry* / Q000378:metabolism; D013379:Substrate Specificity
chemical_list: D003432:Cross-Linking Reagents; D011756:Diphosphates; D009838:Oligodeoxyribonucleotides; D004247:DNA; C046545:CCWGG-specific type II deoxyribonucleases; D015252:Deoxyribonucleases, Type II Site-Specific