A Rep recognition sequence is necessary but not sufficient for nicking of DNA by adeno-associated virus type-2 Rep proteins

Archives of Biochemistry and Biophysics
J WuR A Owens

Abstract

The strand-specific, site-specific endonuclease (nicking) activity of the Rep68 and Rep78 (Rep68/78) proteins of adeno-associated virus type 2 (AAV) is involved in AAV replication, and appears to be involved in AAV site-specific integration. Rep68/78 cuts within the inverted terminal repeats (ITRs) of the AAV genome and in the AAV preferred integration locus on human chromosome 19 (AAVS1). The known endonuclease cut sites are 11-16 bases away from the primary binding sites, known as Rep recognition sequences (RRSs). A linear, double-stranded segment of DNA, containing an RRS and a cut site, has previously been shown to function as a substrate for the Rep68/78 endonuclease activity. We show here that mutation of the Rep recognition sequence, within such a DNA segment derived from the AAV ITRs, eliminates the ability of this substrate to be cleaved detectably by Rep78. Rep78 nicks the RRS-containing site from AAVS1 about half as well as the linear ITR sequence. Eighteen other RRS-containing sequences found in the human genome, but outside AAVS1, are not cleaved by Rep78. These results may help to explain the specificity of AAV integration.

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Citations

Feb 18, 2004·Human Gene Therapy·Nicola J PhilpottErik Falck-Pedersen
Aug 5, 2009·Nucleic Acids Research·Gijsbert P van NieropManuel A F V Gonçalves
Jul 29, 2004·Journal of Virology·Nathalie DutheilR Michael Linden
Jan 29, 2010·PloS One·F Curtis Hewitt, R Jude Samulski
Jul 14, 2009·PLoS Pathogens·Jorge Mansilla-SotoR Michael Linden
Mar 5, 2004·Chembiochem : a European Journal of Chemical Biology·Hua Jane LouWeihong Tan

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