Capillary array-based enzyme screening
First Claim
1. A method for identifying a clone expressing an enzyme, the method comprising:
- (a) generating an expression library comprising a plurality of recombinant clones comprising nucleic acid sequences derived from genomic DNA samples of at least one microorganism;
(b) introducing a mixture of a substrate selected for being specific for an enzyme selected from lipases, esterases, proteases, peptidases, reductases, oxidoreductases, lyases, ligases, isomerases, polymerases, synthases, synthetases, glycosidases, transferases, phosphatases, kinases, mono-and dioxygenases, peroxidases, hydrolases, hydratases, nitrilases, transaminases, amidases and acylases and clones from the library into capillaries in a capillary array;
(c) incubating the clones with the substrate in the capillary-array in a reservoir containing water for a period of time to allow water to evaporate in the capillaries sufficient for at least one of the clones to express an enzyme that interacts with the substrate to produce an optically detectable signal;
(d) spatially detecting the signal to identify at least one capillary containing at least one signal-producing clone; and
(e) recovering the signal-producing clone from the identified capillary, thereby identifying a clone expressing an enzyme having the desired enzymatic activity.
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Accused Products
Abstract
A process for screening an expression library to identify clones expressing enzymes having a desired activity is provided. The process involves first generating from genomic DNA samples of one or more microorganisms an expression library comprising a plurality of recombinant cell clones, and then introducing into capillaries in a capillary array a substrate and at least a subset of the clones, either individually or as a mixture. Interaction of the substrate and a clone expressing an enzyme having the desired activity produces an optically detectable signal, which can then be spatially detected to identify capillaries containing clones producing such a signal. The signal-producing clones can then be recovered from the identified capillaries.
47 Citations
29 Claims
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1. A method for identifying a clone expressing an enzyme, the method comprising:
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(a) generating an expression library comprising a plurality of recombinant clones comprising nucleic acid sequences derived from genomic DNA samples of at least one microorganism;
(b) introducing a mixture of a substrate selected for being specific for an enzyme selected from lipases, esterases, proteases, peptidases, reductases, oxidoreductases, lyases, ligases, isomerases, polymerases, synthases, synthetases, glycosidases, transferases, phosphatases, kinases, mono-and dioxygenases, peroxidases, hydrolases, hydratases, nitrilases, transaminases, amidases and acylases and clones from the library into capillaries in a capillary array;
(c) incubating the clones with the substrate in the capillary-array in a reservoir containing water for a period of time to allow water to evaporate in the capillaries sufficient for at least one of the clones to express an enzyme that interacts with the substrate to produce an optically detectable signal;
(d) spatially detecting the signal to identify at least one capillary containing at least one signal-producing clone; and
(e) recovering the signal-producing clone from the identified capillary, thereby identifying a clone expressing an enzyme having the desired enzymatic activity. - 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)
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29. A method for producing a recombinant enzyme having a desired enzyme activity, comprising:
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(a) generating an expression library comprising a plurality of recombinant clones comprising nucleic acid sequences isolated from genomic DNA samples of at least one microorganism;
(b) introducing a mixture of a cell permeabilizing substrate specific for an enzyme selected from lipases, esterases, proteases, peptidases, reductases, oxidoreductases, lyases, ligases, isomerases, polymerases, synthases, synthetases, glycosidases, transferases, phosphatases, kinases, mono-and dioxygenases, peroxidases, hydrolases, hydratases, nitrilases, transaminases, amidases and acylases and recombinant clones from the library into capillaries in a capillary array;
(c) incubating the substrate and the clones in the capillaries to allow specific intracellular interaction of the substrate and a recombinant clone expressing the enzyme having the desired enzyme activity to produce an optically detectable signal;
(c) spatially detecting the signal to identify at least one capillary containing at least one signal-producing recombinant clone;
(d) recovering the signal-producing recombinant clone from identified capillaries;
(e) isolating a nucleic acid sequence from a signal-producing recombinant clone, wherein the nucleic acid sequence encodes an enzyme having the desired specific enzyme activity;
(f) inserting the nucleic acid sequence isolated in (e) into a suitable expression vector to produce a transformable construct;
(g) transforming a suitable host cell with a sequence comprising the transformable construct produced in (f) to produce a recombinant cell; and
(h) recovering from the recombinant cell produced in (g) a recombinant enzyme having the desired enzyme activity expressed by the recombinant cell.
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Specification