title: Miscoding properties of isoguanine (2-oxoadenine) studied in an AMV reverse transcriptase in vitro system.
abstract: We have found that isoguanine (iG) can pair with thymine (iG.T) and the non-natural base, 5-methylisocytosine (iG.iCM) during template directed synthesis catalyzed by AMV reverse transcriptase. The ratio of these pairings is about 1:10, irrespectively which of the templates, poly(C,iG) or poly(I,iG) is used. This ratio corresponds to the ratio of 2-OH and 2-keto tautomers in monomer in aqueous solution and apparently it is not influenced by the template context. Our results indicate also that formation of the reverse transcriptase catalyzed base pairs between iG and A, G or C can occur only at a low frequency, comparable to the frequency, of mismatches of.(ABSTRACT TRUNCATED)
authors.affiliation: Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland.
authors.forename: A M
authors.initials: AM
authors.lastname: Bukowska
authors.forename: J T
authors.initials: JT
authors.lastname: Kuśmierek
mesh_terms: D044503:5-Methylcytosine; D000241:Adenosine; D009189:Avian Myeloblastosis Virus / Q000201:enzymology*; D001482:Base Composition; D003596:Cytosine / Q000031:analogs & derivatives; D003854:Deoxyribonucleotides / Q000378:metabolism; D006151:Guanosine / Q000138:chemical synthesis; D007700:Kinetics; D011089:Polydeoxyribonucleotides; D012194:RNA-Directed DNA Polymerase / Q000378:metabolism*; D013379:Substrate Specificity; D013698:Templates, Genetic; D013941:Thymine
chemical_list: D003854:Deoxyribonucleotides; D011089:Polydeoxyribonucleotides; D006151:Guanosine; C008184:isoguanosine; D044503:5-Methylcytosine; D003596:Cytosine; D012194:RNA-Directed DNA Polymerase; D000241:Adenosine; D013941:Thymine