title: [Cleavage by restriction endonucleases MvaI and EcoRII of substrates modified in amino groups of heterocyclic bases].
abstract: 14-membered DNA-duplexes containing modified nucleoside residues, viz 4-N-methyldeoxycytidine (m4dC), 6-N-methyldeoxyadenosine (m6dA) or deoxyinosine (dI), in only one strand of the recognition site (CCA/TGG) of MvaI and EcoRII endonucleases were synthesized. It was shown that MvaI and EcoRII endonucleases interact with the exocyclic amino groups of the external dC residues and of the central dA residue of the recognition site exposed into the DNA major groove. These endonucleases which are isochizomers were found to possess different mechanisms of substrate cleavage. The ability of MvaI endonuclease to hydrolyze only unmodified strand of methylated duplexes allows one to make site-directed single-strand nicks in double-stranded DNA. Elimination of the 2-NH2-group located in the minor groove of DNA by substituting dI for dG had little, if any, effect on the hydrolytic activity of EcoRII and MvaI endonucleases.
authors.forename: E A
authors.initials: EA
authors.lastname: Kubareva
authors.forename: E S
authors.initials: ES
authors.lastname: Gromova
authors.forename: E A
authors.initials: EA
authors.lastname: Romanova
authors.forename: T S
authors.initials: TS
authors.lastname: Oretskaia
authors.forename: Z A
authors.initials: ZA
authors.lastname: Shabarova
mesh_terms: D001483:Base Sequence; D055598:Chemical Phenomena; D002621:Chemistry; D004247:DNA / Q000378:metabolism*; D015252:Deoxyribonucleases, Type II Site-Specific / Q000378:metabolism*; D006571:Heterocyclic Compounds; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D009692:Nucleic Acid Heteroduplexes / Q000378:metabolism*; D013379:Substrate Specificity
chemical_list: D006571:Heterocyclic Compounds; D009692:Nucleic Acid Heteroduplexes; D004247:DNA; C046545:CCWGG-specific type II deoxyribonucleases; D015252:Deoxyribonucleases, Type II Site-Specific
vernacular_title: Osobennosti rasshchepleniia éndonukleazami restriktsii MvaI i EcoRII substratov, modifitsirovannykh po aminogruppam geterotsiklicheskikh osnovaniĭ.