RNase H domain mutations affect the interaction between Moloney murine leukemia virus reverse transcriptase and its primer-template.
The active sites for the polymerase and nuclease activities of Moloney murine leukemia virus (M-MuLV) reverse transcriptase (RT) reside in separate domains of a single polypeptide. We have studied the effects of RNase H domain mutations on DNA polymerase activity. These mutant RTs displayed decreased processivity of DNA synthesis. We also compared complexes formed between primer-templates and mutant and wild-type reverse transcriptase (RT). Although M-MuLV RT is monomeric in solution, two molecules of RT bound DNA cooperatively, suggesting that M-MuLV RT binds primer-template as a dimer. Some mutant RTs with decreased processivity failed to form the putative dimer.
Telesnitsky
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Department of Biochemistry and Molecular Biophysics, Columbia University College of Physicians and Surgeons, New York, NY 10032.
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D001483:Base Sequence; D001665:Binding Sites; D003001:Cloning, Molecular; D004279:DNA, Viral / Q000235:genetics / Q000378:metabolism; D004259:DNA-Directed DNA Polymerase / Q000235:genetics / Q000378:metabolism*; D015751:Genes, pol; D046911:Macromolecular Substances; D008969:Molecular Sequence Data; D008979:Moloney murine leukemia virus / Q000201:enzymology* / Q000235:genetics*; D016296:Mutagenesis; D009838:Oligodeoxyribonucleotides; D016133:Polymerase Chain Reaction; D012194:RNA-Directed DNA Polymerase / Q000378:metabolism*; D011994:Recombinant Proteins / Q000378:metabolism; D016914:Ribonuclease H / Q000235:genetics / Q000378:metabolism*; D013698:Templates, Genetic
D004279:DNA, Viral; D046911:Macromolecular Substances; D009838:Oligodeoxyribonucleotides; D011994:Recombinant Proteins; D012194:RNA-Directed DNA Polymerase; D004259:DNA-Directed DNA Polymerase; D016914:Ribonuclease H