Method of selecting a desired protein from a library
First Claim
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1. A method of isolating a member of a specific binding pair (sbp) having a desired binding specificity, comprising the following steps:
- (a) incubating a library containing a diverse population of sbp members which are bound to the surface of a microorganism and comprise a binding domain for a complementary member of a sbp (i) with a mixture which contains a complementary sbp (tester) and (ii) with a mixture which does not contain a complementary member of an sbp (driver) or less amounts of the complementary member of the sbp compared to (i) under conditions suitable for binding of the complementary member of an sbp to said binding domain;
(b) washing away unbound microorganisms from step (a) (i) and (a) (ii);
(c) isolating the DNA or RNA from the bound microrganisms of step (b) (i) and (b) (ii);
(d) subjecting the DNA or RNA of step (c) to representational difference analysis (RDA); and
, optionally,(e) expressing the exponentially amplified DNA or RNA of step (d) to obtain a member of an sbp having the desired specificity.
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Abstract
Described is an improved method of selecting a member of a specific binding pair (sbp) having a desired specify, preferably an antibody, from a library expressing said member of a sbp, preferably a phage-display antibody library.
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10 Claims
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1. A method of isolating a member of a specific binding pair (sbp) having a desired binding specificity, comprising the following steps:
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(a) incubating a library containing a diverse population of sbp members which are bound to the surface of a microorganism and comprise a binding domain for a complementary member of a sbp (i) with a mixture which contains a complementary sbp (tester) and (ii) with a mixture which does not contain a complementary member of an sbp (driver) or less amounts of the complementary member of the sbp compared to (i) under conditions suitable for binding of the complementary member of an sbp to said binding domain; (b) washing away unbound microorganisms from step (a) (i) and (a) (ii); (c) isolating the DNA or RNA from the bound microrganisms of step (b) (i) and (b) (ii); (d) subjecting the DNA or RNA of step (c) to representational difference analysis (RDA); and
, optionally,(e) expressing the exponentially amplified DNA or RNA of step (d) to obtain a member of an sbp having the desired specificity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification