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J. Biol. Chem., Vol. 269, Issue 31, 19830-19835, Aug, 1994
P Morel, A Stasiak, SD Ehrlich and E Cassuto
We systematically investigated the effect of heterology on RecA- mediated
strand exchange between double-stranded linear and single- stranded
circular DNA. Strand exchange took place through heterologies of up to
150-200 base pairs when the insertion was at the proximal (initiating) end
of the duplex DNA but was completely blocked by an insert of only 22 base
pairs placed at the distal end of the duplex. In the case of medial
heterology created by insertion either in the duplex or the single-stranded
DNA, the ability of RecA to exchange strands decreased as the heterology
was shifted toward the distal end of the duplex. These results suggest that
two different strand exchange mechanisms operate in the proximal and distal
portions of the duplex substrate.
Effect of length and location of heterologous sequences on RecA- mediated strand exchange
Institut National de la Recherche Agronomique, Domaine de Vilvert, Jouy en Josas, France.
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