Direct cloning
First Claim
Patent Images
1. A method for performing homologous recombination between at least a first linear nucleic acid molecule and a second linear nucleic acid molecule which share at least one region of sequence homology, wherein the method comprises bringing the first nucleic acid molecule into contact with the second nucleic acid molecule in a first step of linear to linear homologous recombination, in the presence of a 5′
- to 3′
exonuclease, RecT, and Red gamma;
wherein the 5′
to 3′
exonuclease is an N-terminally extended RecE expressed from heterologous DNA that comprises or consists of amino acids 1-866 of SEQ ID NO;
1, or a variant of this sequence having at least 95% sequence identity to SEQ ID NO;
1 over the entire length of the 866 amino acid sequence,wherein said first step is carried out in the absence of truncated RecE, Red alpha and Red beta,and wherein the method further comprises bringing the product of the linear to linear homologous recombination reaction into contact with a further nucleic acid molecule in a second step of linear to circular homologous recombination in the presence of Red alpha, Red beta, and Red gamma,wherein said second step is carried out in the absence of the N-terminally extended RecE.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for performing homologous recombination between at least a first nucleic acid molecule and a second nucleic acid molecule which share at least one region of sequence homology. A method for improving the efficiency of homologous recombination.
-
Citations
14 Claims
-
1. A method for performing homologous recombination between at least a first linear nucleic acid molecule and a second linear nucleic acid molecule which share at least one region of sequence homology, wherein the method comprises bringing the first nucleic acid molecule into contact with the second nucleic acid molecule in a first step of linear to linear homologous recombination, in the presence of a 5′
- to 3′
exonuclease, RecT, and Red gamma;wherein the 5′
to 3′
exonuclease is an N-terminally extended RecE expressed from heterologous DNA that comprises or consists of amino acids 1-866 of SEQ ID NO;
1, or a variant of this sequence having at least 95% sequence identity to SEQ ID NO;
1 over the entire length of the 866 amino acid sequence,wherein said first step is carried out in the absence of truncated RecE, Red alpha and Red beta, and wherein the method further comprises bringing the product of the linear to linear homologous recombination reaction into contact with a further nucleic acid molecule in a second step of linear to circular homologous recombination in the presence of Red alpha, Red beta, and Red gamma, wherein said second step is carried out in the absence of the N-terminally extended RecE. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13)
- to 3′
-
12. A method for performing homologous recombination between at least a first linear nucleic acid molecule and a second linear nucleic acid molecule which share at least one region of sequence homology, wherein the method comprises bringing the first nucleic acid molecule into contact with the second nucleic acid molecule in a first step of linear to linear homologous recombination, in the presence of a 5′
- to 3′
exonuclease, RecT, and Red gamma;wherein the 5′
to 3′
exonuclease is an N-terminally extended RecE expressed from heterologous DNA that comprises or consists of amino acids 1-866 of SEQ ID NO;
1, or a variant of this sequence having at least 95% sequence identity to SEQ ID NO;
1 over the entire length of the 866 amino acid sequence,and wherein the method further comprises bringing the product of the linear to linear homologous recombination reaction into contact with a further nucleic acid molecule in a second step of linear to circular homologous recombination in the presence of Red alpha, Red beta, and Red gamma, wherein the method is carried out in a host cell which expresses the N-terminally extended RecE under the control of a first inducible promoter, and Red alpha/beta under the control of a second inducible promoter that is independently temporally expressed, wherein only the first inducible promoter is induced immediately prior to the first step of linear to linear homologous recombination such that the N-terminally extended RecE mediates the first step of linear to linear homologous recombination, and wherein only the second inducible promoter is induced immediately prior to the second step of linear to circular homologous recombination such that Red alpha/beta mediates the second step of linear to circular homologous recombination. - View Dependent Claims (14)
- to 3′
Specification