Method of providing a hybrid polypeptide exhibiting an activity of interest
First Claim
1. A method for providing a hybrid polypeptide having an activity of interest, comprising:
- i) performing PCR amplification using an uncharacterized DNA sample and oligonucleotide primers with homology to one or more known genes encoding a polypeptide exhibiting the activity of interest, to obtain one or more PCR products of unknown sequence;
ii) linking the obtained PCR products of unknown sequence to a 5′
structural gene sequence and a 3′
structural gene sequence, wherein the 5′ and
3′
structural gene sequences are derived from one or more genes encoding a polypeptide exhibiting the activity of interest, to form hybrid DNA sequences;
iii) expressing the hybrid DNA sequences; and
iv) screening the expressed hybrid DNA sequences to identify a sequence encoding a polypeptide exhibiting the activity of interest or a related activity.
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Abstract
A method for providing a hybrid polypeptide having an activity of interest, by i) performing PCR amplification using an uncharacterized DNA sample and oligonucleotide primers with homology to one or more known genes encoding a polypeptide exhibiting said activity of interest, to obtain one or more PCR products, ii) linking the obtained PCR products to a 5′ structural gene sequence and a 3′ structural gene sequence, wherein the 5′ and 3′ structural gene sequences are derived from one or more genes encoding a polypeptide exhibiting said activity of interest, to form hybrid DNA sequences, iii) expressing the resulting hybrid DNA sequences, and iv) screening the hybrid polypeptides to identify a sequence encoding a polypeptide exhibiting said activity of interest or a related activity.
24 Citations
33 Claims
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1. A method for providing a hybrid polypeptide having an activity of interest, comprising:
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i) performing PCR amplification using an uncharacterized DNA sample and oligonucleotide primers with homology to one or more known genes encoding a polypeptide exhibiting the activity of interest, to obtain one or more PCR products of unknown sequence;
ii) linking the obtained PCR products of unknown sequence to a 5′
structural gene sequence and a 3′
structural gene sequence, wherein the 5′ and
3′
structural gene sequences are derived from one or more genes encoding a polypeptide exhibiting the activity of interest, to form hybrid DNA sequences;
iii) expressing the hybrid DNA sequences; and
iv) screening the expressed hybrid DNA sequences to identify a sequence encoding a polypeptide exhibiting the activity of interest or a related activity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 12, 13, 14, 23, 24, 25, 26, 27)
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10. A method for providing a hybrid polypeptide exhibiting an activity of interest, comprising:
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i) performing PCR amplification using a DNA sample derived from one or more microorganisms and PCR primers homologous to conserved regions of a known gene encoding a polypeptide exhibiting the activity of interest to obtain one or more PCR products of unknown sequence;
ii) inserting the obtained one or more PCR products of unknown sequence into a gene encoding a parent polypeptide having the activity of interest, wherein the gene is situated in an expression vector, wherein a library or expression vectors containing hybrid DNA sequences is provided;
iii) transforming the expression vector library into a suitable host cell to obtain a library of transformed clones;
iv) culturing the library of step iii) under suitable conditions for expression of said hybrid polypeptides; and
v) screening the library of hybrid polypeptides to identify a polypeptide exhibiting the activity of interest or related activity. - View Dependent Claims (11, 15, 16, 17, 18, 19, 20, 21, 22, 28, 29, 30, 31)
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32. A method of providing a hybrid polypeptide exhibiting an activity of interest, comprising:
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i) performing PCR amplification using a DNA sample derived from one or more microorganisms using a first primer and a second primer to provide a PCR fragment of an unknown gene having the activity of interest to obtain one or more PCR products of unknown sequence;
wherein the first primer has an exact sequence matching a sequence at the 5′
end of a known gene encoding a polypeptide having the activity of interest and a degenerated consensus sequence;
wherein the second primer has an exact sequence matching a sequence at the 3′
end of a known gene encoding a polypeptide having the activity of interest and a degenerated consensus sequence;
ii) inserting the obtained one or more PCR products of unknown sequence into a gene encoding a parent polypeptide having the activity of interest, wherein the gene is situated in an expression vector, wherein a library or expression vectors containing hybrid DNA sequences is provided;
iii) transforming the expression vector library into a suitable host cell to obtain a library of transformed clones;
iv) culturing the library of step iii) under suitable conditions for expression of said hybrid polypeptides; and
v) screening the library of hybrid polypeptides to identify a polypeptide exhibiting the activity of interest or related activity. - View Dependent Claims (33)
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Specification