Screening for novel bioactivities
First Claim
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1. A method for identifying a desired activity encoded by a genomic DNA population comprising:
- (a) obtaining a single-stranded genomic DNA population;
(b) contacting the single-stranded DNA population of (a) with a DNA probe tunder conditions and for sufficient time to allow hybridization and to produce a double-stranded complex of probe and members of the genomic DNA population which hybridize thereto;
(c) separating the complex from the single-stranded DNA population of (b);
(d) releasing from the probe the members of the genomic population which had been bound to the probe;
(e) forming double-stranded DNA from the members of the genomic population of (d);
(f) introducing the double-stranded DNA of (e) into a suitable host cell to produce an expression library containing a plurality of clones containing the selected DNA; and
(g) screening the expression library for the desired activity.
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Abstract
Disclosed is a process for identifying clones having a specified enzyme activity by screening for the specified enzyme activity in a library of clones prepared by (i) selectively isolating target nucleic acid from nucleic acid derived from at least one microorganism, by use of at least one polynucleotide probe comprising at least a portion of a nucleic acid sequence encoding an enzyme having the specified enzyme activity; and (ii) transforming a host with isolated target nucleic acid to produce a library of clones which are screened for the specified enzyme activity.
192 Citations
38 Claims
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1. A method for identifying a desired activity encoded by a genomic DNA population comprising:
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(a) obtaining a single-stranded genomic DNA population; (b) contacting the single-stranded DNA population of (a) with a DNA probe tunder conditions and for sufficient time to allow hybridization and to produce a double-stranded complex of probe and members of the genomic DNA population which hybridize thereto; (c) separating the complex from the single-stranded DNA population of (b); (d) releasing from the probe the members of the genomic population which had been bound to the probe; (e) forming double-stranded DNA from the members of the genomic population of (d); (f) introducing the double-stranded DNA of (e) into a suitable host cell to produce an expression library containing a plurality of clones containing the selected DNA; and (g) screening the expression library for the desired activity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for preselecting a desired DNA from a genomic DNA population comprising:
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(a) obtaining a single-stranded genomic DNA population; (b) contacting the single-stranded DNA population of (a) with a ligand-bound oligonucleotide probe that is complementary to a secretion signal sequence unique to a given class of proteins under conditions permissive of hybridization to form a double-stranded complex; (c) contacting the double-stranded complex of (a) with a solid phase specific binding partner for said ligand so as to produce a solid phase complex; (d) separating the solid phase complex from the single-stranded DNA population of (a); (e) releasing the members of the genomic population which had bound to said solid phase bound probe; (f) separating the solid phase bound probe from the members of the genomic population which had bound thereto; (g) forming double-stranded DNA from the members of the genomic population of (e); (h) introducing the double-stranded DNA of (g) into a suitable host cell to form an expression library containing a plurality of clones containing the selected DNA; and (i) screening the expression library for the desired activity. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A method for identifying a desired bioactivity or biomolecule comprising:
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(a) producing one or more expression libraries derived from nucleic acid directly isolated from the environment; (b) combining a cell-free extract from the expression library or libraries with crude or partially purified extracts, or pure proteins from a metabolically rich cell line to form an extract mixture free from the library and cell line cells; and (c) screening said mixture to identify an activity or molecule produced by the extract mixture.
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38. A method for identifying a desired bioactivity or biomolecule comprising:
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(a) producing one or more expression libraries containing clones having nucleic acid inserts derived from nucleic acid directly isolated from the environment; (b) transferring said clones into a metabolically rich cell line; and (c) screening said cell line to identify clones having a bioactivity or biomolecule of interest.
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Specification