RecA nucleoprotein filament and methods
First Claim
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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Accused Products
Abstract
A stable, single-stranded nucleoprotein filament adapted to complex specifically and stably with a target duplex DNA having a selected base sequence. The filament is composed of a single-stranded DNA probe having a region of homology with the target base sequence, and RecA protein bound stably to the DNA probe by adenosine 5'"'"'-(γ-thio)triphosphate. The filament is useful in a novel system and method for enriching target duplex DNA which contains a region homologous to the probe sequence, for blocking selected restriction endonuclease sites in the target DNA, and in other DNA methodologies in which stable rapid triple-strand synaptic formation in duplex DNA can be exploited.
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Citations
14 Claims
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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, comprising
providing 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, and treating the support to release target DNA molecules which are selectively bound to the support through such complex formation. - View Dependent Claims (2, 3, 4, 5, 6)
- -thio)triphosphate,
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7. A method of forming a stable, single-stranded nucleoprotein filament effective to complex stably and specifically with a target duplex DNA having a selected base sequence, said method comprising
providing a single-stranded DNA probe having a region of homology with such selected base sequence, and reacting the DNA probe with RecA protein in the presence of adenosine 5'"'"'-(γ - -thio)triphosphate at a Mg++ concentration of less than about 10-20 mM.
- View Dependent Claims (8)
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9. A system for separating target and non-target duplex DNA molecules on the basis of a selected base sequence which is unique to the target sequence, comprising
stable, single-stranded nucleoprotein filaments, each composed of a single-stranded DNA probe having a region of homology with the selected base sequence, said filaments having a biotin/avidin complex formed by binding avidin, streptavidin, or an analog thereof with biotin, said complex derivatized to the probe nucleotides through disulfide linkages, and said filaments having RecA protein molecules bound stably to the DNA probe, in the presence of adenosine 5'"'"'-(γ - -thio)triphosphate, to promote rapid homologous alignment between the probe and homologous target base sequences, with formation of a stable filament/target complex, and
a solid support, designed to selectively bind target molecules, with surface-bound binding molecules effective to selectively bind biotin/avidin complexes to the support when the filaments are complexed by such homologous alignment to such target sequences, wherein said binding molecules are iminodiacetic acid moieties which are effective to bind to such biotin/avidin complexes in the presence of Cu++.
- -thio)triphosphate, to promote rapid homologous alignment between the probe and homologous target base sequences, with formation of a stable filament/target complex, and
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10. A system for separating target and non-target duplex DNA molecules on the basis of a selected base sequence which is unique to the target sequence, comprising
stable, single-stranded nucleoprotein filaments, each composed of a single-stranded DNA probe having a region of homology with the selected base sequence, said filaments having biotin derivatized to the probe nucleotides through disulfide linkages and said filaments having RecA protein molecules bound stably to the DNA probe, in the presence of adenosine 5'"'"'-(γ - -thio)triphosphate, to promote rapid homologous alignment between the probe and homologous target base sequences, with formation of a stable filament/target complex, and
a solid support, designed to selectively bind target molecules, with surface-bound binding molecules effective to selectively bind biotin to the support when the filaments are complexed by such homologous alignment to such target sequences, wherein said binding molecules are avidin, streptavidin, or analogues thereof.
- -thio)triphosphate, to promote rapid homologous alignment between the probe and homologous target base sequences, with formation of a stable filament/target complex, and
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11. A stable, single-stranded nucleoprotein filament effective to complex specifically and stably with a target duplex DNA having a selected base sequence, in the absence of single-strand binding protein, said filament comprising
a single-stranded DNA probe having a region of homology with such selected base sequence, wherein said probe is derivatized with one or more ligands effective to bind specifically and with high affinity to binding molecules carried on a solid support, when the filament is complexed with target duplex DNA, and RecA protein molecules bound stably to the DNA probe in the presence of adenosine 5'"'"'-(γ - -thio)triphosphate.
- View Dependent Claims (12, 13, 14)
Specification