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- W2106293802 abstract "ABSTRACT The Rep78 protein of adeno-associated virus (AAV) contains amino acid sequence motifs common to rolling-circle replication (RCR) initiator proteins. In this report, we describe RCR initiator-like activities of Rep78. We demonstrate that a maltose-binding protein (MBP)–Rep78 fusion protein can catalyze the cleavage and ligation of single-stranded DNA substrates derived from the AAV origin of replication. Rep-mediated single-stranded DNA cleavage was strictly dependent on the presence of certain divalent cations (e.g., Mn 2+ or Mg 2+ ) but did not require the presence of a nucleoside triphosphate cofactor. Electrophoretic mobility shift assays demonstrated that binding of single-stranded DNA by MBP-Rep78 was influenced by the length of the substrate as well as the presence of potential single-stranded cis -acting sequence elements. Site-directed mutagenesis was used to examine the role of specific tyrosine residues within a conserved RCR motif (motif 3) of Rep78. Replacement of Tyr-156 with phenylalanine abolished the ability of MBP-Rep78 to mediate the cleavage and ligation of single-stranded DNA substrates but not the ability to stably bind single-stranded DNA. The cleaving-joining activity of Rep78 is consistent with the mechanism of replicative intermediate dimer resolution proposed for the autonomous parvoviruses and may have implications for targeted integration of recombinant AAV vectors." @default.
- W2106293802 created "2016-06-24" @default.
- W2106293802 creator A5012545835 @default.
- W2106293802 creator A5080944120 @default.
- W2106293802 date "2000-04-01" @default.
- W2106293802 modified "2023-10-04" @default.
- W2106293802 title "An Adeno-Associated Virus (AAV) Initiator Protein, Rep78, Catalyzes the Cleavage and Ligation of Single-Stranded AAV <i>ori</i> DNA" @default.
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- W2106293802 doi "https://doi.org/10.1128/jvi.74.7.3122-3129.2000" @default.
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