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pubmed-article:10788512pubmed:abstractTextThe 55-kDa reverse transcriptase (RT) domain of the Ty3 POL3 open reading frame was purified and evaluated on conformationally distinct nucleic acid duplexes. Purified enzyme migrated as a monomer by size exclusion chromatography. Enzymatic footprinting indicate Ty3 RT protects template nucleotides +7 through -21 and primer nucleotides -1 through -24. Contrary to previous data with retroviral enzymes, a 4-base pair region of the template-primer duplex remained nuclease accessible. The C-terminal portion of Ty3 RT encodes a functional RNase H domain, although the hydrolysis profile suggests an increased spatial separation between the catalytic centers. Despite conservation of catalytically important residues in the RNase H domain, Fe(2+) fails to replace Mg(2+) in the RNase H catalytic center for localized generation of hydroxyl radicals, again suggesting this domain may be structurally distinct from its retroviral counterparts. RNase H specificity was investigated using a model system challenging the enzyme to select the polypurine tract primer from within an RNA/DNA hybrid, extend this into (+) DNA, and excise the primer from nascent DNA. Purified RT catalyzed each of these three steps but was almost inactive on a non-polypurine tract RNA primer. Our studies provide the first detailed characterization of the enzymatic activities of a retrotransposon reverse transcriptase.lld:pubmed
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pubmed-article:10788512pubmed:authorpubmed-author:MillerJ TJTlld:pubmed
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pubmed-article:10788512pubmed:pagination13879-87lld:pubmed
pubmed-article:10788512pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:10788512pubmed:articleTitleInteraction of p55 reverse transcriptase from the Saccharomyces cerevisiae retrotransposon Ty3 with conformationally distinct nucleic acid duplexes.lld:pubmed
pubmed-article:10788512pubmed:affiliationHuman Immunodeficiency Virus Drug Resistance Program, Division of Basic Sciences, NCI-Frederick Cancer Research and Development Center, Frederick, Maryland 21702, USA.lld:pubmed
pubmed-article:10788512pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:10788512pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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