In vitro recombination method
First Claim
1. A kit for in vitro joining a plurality of dsDNA molecules, consisting essentially of in a single container,a mixture of the isolated proteins(i) a single stranded DNA binding protein (SSB) which accelerates nucleic acid annealing,(ii) a non strand-displacing DNA polymerase, and(iii) a ligase;
- (iv) an isolated non-processive 5′
exonuclease; and
(v) glycerol in an amount effective as a preservative;
wherein the ratios of activities of (i), (ii), (iii), and (iv) are effective to achieve in vitro joining of dsDNA molecules, andwherein the dsDNA molecules are joined via a region of sequence homology to form a DNA molecule in which a single copy of the region of sequence homology is retained.
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Abstract
The present invention relates, e.g., to in vitro method, using isolated protein reagents, for joining two double stranded (ds) DNA molecules of interest, wherein the distal region of the first DNA molecule and the proximal region of the second DNA molecule share a region of sequence identity, comprising contacting the two DNA molecules in a reaction mixture with (a) a non-processive 5′ exonuclease; (b) a single stranded DNA binding protein (SSB) which accelerates nucleic acid annealing; (c) a non strand-displacing DNA polymerase; and (d) a ligase, under conditions effective to join the two DNA molecules to form an intact double stranded DNA molecule, in which a single copy of the region of sequence identity is retained. The method allows the joining of a number of DNA fragments, in a predetermined order and orientation, without the use of restriction enzymes.
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Citations
9 Claims
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1. A kit for in vitro joining a plurality of dsDNA molecules, consisting essentially of in a single container,
a mixture of the isolated proteins (i) a single stranded DNA binding protein (SSB) which accelerates nucleic acid annealing, (ii) a non strand-displacing DNA polymerase, and (iii) a ligase; -
(iv) an isolated non-processive 5′
exonuclease; and(v) glycerol in an amount effective as a preservative; wherein the ratios of activities of (i), (ii), (iii), and (iv) are effective to achieve in vitro joining of dsDNA molecules, and wherein the dsDNA molecules are joined via a region of sequence homology to form a DNA molecule in which a single copy of the region of sequence homology is retained. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A composition consisting essentially of:
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(a) a substantially purified single stranded DNA binding protein (SSB) which accelerates nucleic acid annealing, (b) a substantially purified non strand-displacing DNA polymerase, (c) a substantially purified ligase, and (d) substantially purified non-processive 5′
exonuclease, and(e) glycerol in an amount effective as a preservative; wherein the ratios of activities of (a), (b), (c) and (d) are effective to achieve in vitro joining of dsDNA molecules via a region of homology.
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Specification