Kits and methods of detection using cellulose binding domain fusion proteins
First Claim
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1. A diagnostic kit for the detection of a substance of interest comprising:
- (a) a cellulose binding domain (CBD) fusion product comprising (i) a CBD the amino acid sequence of which comprises the amino acid sequence of SEQ ID NO;
2 and which is capable of binding to cellulose with high affinity and substantially free of other proteins with which it is naturally associated, and (ii) a second protein capable of binding a substance of interest;
(b) a detectable label; and
(c) cellulose.
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Abstract
A cellulose binding domain (CBD) having a high affinity for crystalline cellulose and chitin is disclosed, along with methods for the molecular cloning and recombinant production thereof. Fusion products comprising the CBD and a second protein are likewise described. A wide range of applications are contemplated for both the CBD and the fusion products, including drug delivery, affinity separations, and diagnostic techniques.
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Citations
36 Claims
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1. A diagnostic kit for the detection of a substance of interest comprising:
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(a) a cellulose binding domain (CBD) fusion product comprising (i) a CBD the amino acid sequence of which comprises the amino acid sequence of SEQ ID NO;
2 and which is capable of binding to cellulose with high affinity and substantially free of other proteins with which it is naturally associated, and (ii) a second protein capable of binding a substance of interest;(b) a detectable label; and (c) cellulose. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An immunoassay method of detecting the presence of a substance of interest in a test sample comprising:
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(a) incubating a test sample, which may contain a substance of interest, with a sufficient amount of a cellulose binding domain (CBD fusion product comprising (i) a CBD the amino acid sequence of which comprises the amino acid sequence of SEQ ID NO;
2 and which is capable of binding to cellulose with high affinity and substantially free of other proteins with which it is naturally associated, and (ii) a second protein capable of binding said substance of interest, under conditions that allow for the binding of said substance of interest to said second protein of said CBD fusion product;(b) adding an amount of cellulose effective to bind the amount of said CBD fusion product used in step (a) to provide an insoluble cellulose-CBD fusion product binding complex; (c) separating said insoluble cellulose-CBD fusion product binding complex from unbound components; (d) incubating said insoluble cellulose-CBD fusion product binding complex with a sufficient amount of a detectable label, said label capable of binding to said substance of interest; and (e) separating said insoluble cellulose-CBD fusion product binding complex of step (d) from unbound components and determining the presence or absence of said label, to provide an indication of the presence or absence of said substance of interest in said test sample. - View Dependent Claims (12, 13, 15, 16, 17, 18, 22, 23)
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8. A method of detecting the presence of a substance of interest in a test sample comprising:
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(a) contacting a test sample, which may contain a substance of interest, with an insoluble matrix capable of immobilizing said substance of interest; (b) incubating said insoluble matrix with a sufficient amount of a CBD fusion product comprising (i) a cellulose binding domain (CBD) the amino acid sequence of which comprises the amino acid sequence of SEQ ID NO;
2 and which is capable of binding to cellulose with high affinity and substantially free of other proteins with which it is naturally associated, and (ii) a second protein capable of binding said immobilized substance of interest, under conditions that allow for the binding of said immobilized substance of interest to said second protein of said CBD fusion product;(c) separating said insoluble matrix of step (b) from unbound components; (d) incubating said insoluble matrix of step (c) with a detectable label capable of binding said substance of interest or said CBD fusion product under conditions that allow for the binding of said label to said substance of interest or said CBD fusion product; and (e) separating said insoluble matrix of step (d) from unbound components and determining the presence or absence of said label, to provide an indication of the presence or absence of said substance of interest in said test sample. - View Dependent Claims (9, 10, 11, 14, 19, 20, 21)
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24. A dip stick useful in detecting a substance of interest in a test sample comprising a cellulose binding domain (CBD) fusion product, said CBD fusion product comprising (i) a CBD the amino acid sequence of which comprises the amino acid sequence of SEQ ID NO:
- 2 and which is capable of binding to cellulose with high affinity and substantially free of other proteins with which it is naturally associated, and (ii) a second protein capable of binding a substance of interest.
- View Dependent Claims (25, 36)
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26. A signal amplification kit comprising
(a) a first cellulose binding domain (CBD) fusion product comprising: -
(i) a CBD the amino acid sequence of which comprises the amino acid sequence of SEQ ID NO;
2, and(ii) a second protein capable of binding a chimeric probe, said chimeric probe further capable of binding a protein of interest; (b) a chimeric probe; and (c) a second CBD fusion product comprising (i) a CBD the amino acid sequence of which comprises the amino acid sequence of SEQ ID NO;
2, and (ii) an enzyme capable of acting on a substrate to produce a detectable compound. - View Dependent Claims (27, 31, 32, 33, 35)
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28. A signal amplification kit comprising:
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(a) a cellulose binding domain (CBD) fusion product comprising (i) a CBD the amino acid sequence of which comprises the amino acid sequence of SEQ ID NO;
2, and(ii) a second protein capable of binding a chimeric probe, said probe further capable of binding a substance of interest; and (b) labeled CBD, said CBD the amino acid sequence of which comprises the amino acid sequence of SEQ ID NO;
2. - View Dependent Claims (34)
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29. A signal amplification kit comprising:
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(a) a cellulose binding domain (CBD) fusion comprising; (i) a CBD, the amino acid sequence of which comprises the amino acid sequence of SEQ ID NO;
2, and(ii) a second protein capable of binding a third protein, said third protein further capable of binding a protein of interest; and (b) a third protein. - View Dependent Claims (30)
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Specification