Methods for producing recombined antibodies
First Claim
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1. A method of producing a polynucleotide encoding an antibody chain that specifically binds to a predetermined antigen, the method comprising:
- (a) denaturing a population of polynucleotide segments encoding CDR regions;
(b) annealing the denatured population of CDR encoding polynucleotides;
(c) incubating the annealed CDR encoding polynucleotides in the presence of a polymerase, thereby forming a population of polynucleotides comprising recombinant polynucleotides encoding antibodies with novel combinations of CDR regions, which novel combinations of CDR regions are not present in an antibody encoded by the population of polynucleotide segments provided in step (a);
(d) repeating steps (a) through (c); and
(e) screening or selecting the population of polynucleotides to identify at least one polynucleotide that encodes an antibody chain that specifically binds to a predetermined antigen.
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Abstract
A method for DNA reassembly after random fragmentation, and its application to mutagenesis of nucleic acid sequences by in vitro or in vivo recombination is described. In particular, a method for the production of nucleic acid fragments or polynucleotides encoding mutant proteins is described. The present invention also relates to a method of repeated cycles of mutagenesis, shuffling and selection which allow for the directed molecular evolution in vitro or in vivo of proteins.
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Citations
37 Claims
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1. A method of producing a polynucleotide encoding an antibody chain that specifically binds to a predetermined antigen, the method comprising:
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(a) denaturing a population of polynucleotide segments encoding CDR regions;
(b) annealing the denatured population of CDR encoding polynucleotides;
(c) incubating the annealed CDR encoding polynucleotides in the presence of a polymerase, thereby forming a population of polynucleotides comprising recombinant polynucleotides encoding antibodies with novel combinations of CDR regions, which novel combinations of CDR regions are not present in an antibody encoded by the population of polynucleotide segments provided in step (a);
(d) repeating steps (a) through (c); and
(e) screening or selecting the population of polynucleotides to identify at least one polynucleotide that encodes an antibody chain that specifically binds to a predetermined antigen. - 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)
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25. An antibody comprising a novel combination of heavy CDR regions or a novel combination of light chain CDRs.
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26. An antibody comprising a novel combination of heavy CDR regions and a novel combination of light chain CDRs.
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27. A library of recombinant DNA sequences encoding antibodies produced by the steps of:
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(a) providing a population of DNA fragments comprising at least one polynucleotide encoding all or part of an antibody;
(b) recursively recombining the DNA fragments in vitro or in vivo to form a pool of recombined polynucleotides encoding antibodies or subportions thereof, which pool of polynucleotides encoding antibodies or subportions thereof comprises a library of recombinant DNA sequences. - View Dependent Claims (28, 29, 30)
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31. An antibody with a desired property produced by the steps of:
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(a) providing a population of DNA fragments comprising at least one polynucleotide encoding all or part of an antibody;
(b) recursively recombining the DNA fragments in vitro or in vivo to form a pool of recombined antibody polynucleotides; and
(c) identifying at least one recombined antibody polynucleotide encoding an antibody with a desired property. - View Dependent Claims (32, 33, 34, 35, 36, 37)
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Specification