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RecA nucleoprotein filament and methods

  • US 4,888,274 A
  • Filed: 01/20/1987
  • Issued: 12/19/1989
  • Est. Priority Date: 09/18/1985
  • Status: Expired due to Term
First Claim
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1. A method of separating target and non-target duplex DNA molecules on the basis of a selected base sequence which is unique to the target sequence, comprisingproviding stable, single-stranded nucleoprotein filaments, each composed of a single-stranded DNA probe having a region of homology with the selected base sequence, and RecA protein molecules bound stably to the DNA probe, in the presence of adenosine 5'"'"'-(γ

  • -thio)triphosphate,reacting the filaments with the target and non-target DNA molecules under conditions which promote rapid homologous alignment between the probe and homologous target base sequences in the reaction mixture, with formation of a stable filament/target complex,contacting the reaction mixture with a solid support designed to selectively bind target molecules which are complexed with said filaments by such homologous alignment,removing non-bound DNA molecules from the support, andtreating the support to release target DNA molecules which are selectively bound to the support through such complex formation.

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