Methods and compositions for cellular and metabolic engineering
First Claim
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1. A method of evolving a biocatalytic activity of a cell, comprising:
- (a) recombining at least first and second DNA subsequences derived from the sequence of at least one gene conferring ability to catalyze a reaction of interest, the subsequences differing from each other in at least two nucleotides, to produce a library of recombinant genes, and wherein the reaction of interest is the metabolism of cellulose;
(b) screening at least one recombinant gene from the library that confers enhanced ability to catalyze the reaction of interest by the cell relative to a wildtype form of the gene;
(c) recombining at least a subsequence derived from the at least one recombinant gene with a further DNA subsequence derived from the at least one gene, the same or different from the first and second subsequences, to produce a further library of recombinant genes;
(d) screening, at least one further recombinant gene from the further library of recombinant genes that confers enhanced ability to catalyze the reaction of interest by the cell relative to a previous recombinant gene;
(e) repeating (c) and (d), as necessary, until the further recombinant gene confers a desired level of enhanced ability to catalyze the reaction of interest by the cell.
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Abstract
The present invention is generally directed to the evolution of new metabolic pathways and the enhancement of bioprocessing through a process herein termed recursive sequence recombination. Recursive sequence recombination entails performing iterative cycles of recombination and screening or selection to “evolve” individual genes, whole plasmids or viruses, multigene clusters, or even whole genomes. Such techniques do not require the extensive analysis and computation required by conventional methods for metabolic engineering.
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Citations
14 Claims
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1. A method of evolving a biocatalytic activity of a cell, comprising:
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(a) recombining at least first and second DNA subsequences derived from the sequence of at least one gene conferring ability to catalyze a reaction of interest, the subsequences differing from each other in at least two nucleotides, to produce a library of recombinant genes, and wherein the reaction of interest is the metabolism of cellulose; (b) screening at least one recombinant gene from the library that confers enhanced ability to catalyze the reaction of interest by the cell relative to a wildtype form of the gene; (c) recombining at least a subsequence derived from the at least one recombinant gene with a further DNA subsequence derived from the at least one gene, the same or different from the first and second subsequences, to produce a further library of recombinant genes; (d) screening, at least one further recombinant gene from the further library of recombinant genes that confers enhanced ability to catalyze the reaction of interest by the cell relative to a previous recombinant gene; (e) repeating (c) and (d), as necessary, until the further recombinant gene confers a desired level of enhanced ability to catalyze the reaction of interest by the cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification