Method for in vitro molecular evolution of protein function
First Claim
1. A method for generating a polynucleotide sequence or population of sequences from at least one parent polynucleotide sequence encoding one or more protein motifs, comprising the steps of a) digesting the at least one parent polynucleotide sequence with at least one exonuclease to generate at least one population of fragments, wherein said digesting with at least one exonuclease comprises digesting a first parent polynucleotide sequence with a first exonuclease to produce a first population of fragments and digesting a second parent polynucleotide sequence with a second exonuclease to produce a second population of fragments;
- b) contacting said first and second population of fragments, wherein said fragments of said first and second population of fragments anneal;
c) amplifying the annealed fragments of step b) to generate at least one polynucleotide sequence encoding one or more protein motifs having altered characteristics as compared to the one or more protein motifs encoded by said parent polynucleotide wherein in step (a) at least one parameter of the reaction used for digestion of the first population of single stranded polynucleotide molecules is different from the equivalent parameter(s) used in the reaction for digestion of the second population of single stranded polynucleotide molecules.
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Abstract
The present invention relates to a method for in vitro evolution of protein function. In particular, the method relates to the shuffling of nucleotide segments obtained from exonuclease digestion. The present inventors have shown that polynucleotide fragments derived from a parent polynucleotide sequence digested with an exonuclease can be combined to generate a polynucleotide sequence which encodes for a polypeptide having desired characteristics. This method may be usefully applied to the generation of new proteins (e.g., antibodies and enzymes) or parts thereof having modified characteristics as compared to the parent protein.
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Citations
39 Claims
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1. A method for generating a polynucleotide sequence or population of sequences from at least one parent polynucleotide sequence encoding one or more protein motifs, comprising the steps of
a) digesting the at least one parent polynucleotide sequence with at least one exonuclease to generate at least one population of fragments, wherein said digesting with at least one exonuclease comprises digesting a first parent polynucleotide sequence with a first exonuclease to produce a first population of fragments and digesting a second parent polynucleotide sequence with a second exonuclease to produce a second population of fragments; -
b) contacting said first and second population of fragments, wherein said fragments of said first and second population of fragments anneal;
c) amplifying the annealed fragments of step b) to generate at least one polynucleotide sequence encoding one or more protein motifs having altered characteristics as compared to the one or more protein motifs encoded by said parent polynucleotide wherein in step (a) at least one parameter of the reaction used for digestion of the first population of single stranded polynucleotide molecules is different from the equivalent parameter(s) used in the reaction for digestion of the second population of single stranded polynucleotide molecules. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 38, 39)
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35. A novel green fluorescent protein comprising the amino acid sequence consisting of SEQ ID NO:
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36. A nucleic acid sequence encoding SEQ ID NO:
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37. A nucleic acid sequence comprising SEQ ID NO:
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Specification