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• W1994092786 abstract "Interaction between the adenoassociated virus (AAV) replication proteins, Rep68 and 78, and the viral terminal repeats (TRs) is mediated by a DNA sequence termed the Rep-binding element (RBE). This element is necessary for Rep-mediated unwinding of duplex DNA substrates, directs Rep catalyzed cleavage of the AAV origin of DNA replication, and is required for viral transcription and proviral integration. Six discrete Rep complexes with the AAV TR substrates have been observed in vitro, and cross-linking studies suggest these complexes contain one to six molecules of Rep. However, the functional relationship between Rep oligomerization and biochemical activity is unclear. Here we have characterized Rep complexes that form on the AAV TR. Both Rep68 and Rep78 appear to form the same six complexes with the AAV TR, and ATP seems to stimulate formation of specific, higher order complexes. When the sizes of these Rep complexes were estimated on native polyacrylamide gels, the four slower migrating complexes were larger than predicted by an amount equivalent to one or two TRs. To resolve this discrepancy, the molar ratio of protein and DNA was calculated for the three largest complexes. Data from these experiments indicated that the larger complexes included multiple TRs in addition to multiple Rep molecules and that the Rep-to-TR ratio was approximately 2. The two largest complexes were also associated with increased Rep-mediated, origin cleavage activity. Finally, we characterized a second, Rep-mediated cleavage event that occurs adjacent to the normal nicking site, but on the opposite strand. This second site nicking event effectively results in double-stranded DNA cleavage at the normal nicking site." @default.
• W1994092786 created "2016-06-24" @default.
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• W1994092786 creator A5038701662 @default.
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• W1994092786 date "2003-09-01" @default.
• W1994092786 modified "2023-09-26" @default.
• W1994092786 title "Characterization of the adenoassociated virus Rep protein complex formed on the viral origin of DNA replication" @default.
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• W1994092786 doi "https://doi.org/10.1016/s0042-6822(03)00340-4" @default.
• W1994092786 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12954205" @default.
• W1994092786 hasPublicationYear "2003" @default.
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