Affinity tag nucleic acid and protein compositions, and processes for using same
First Claim
9. A chimeric nucleic acid comprising at least two portions, a first portion comprising a nucleic acid complementary to a nucleic acid sequence of interest, and a second portion comprising a metal binding peptide, wherein said metal binding peptide is attached to one or more nucleotides of the nucleic acid in said first portion through a sugar or phosphate of said nucleotide or nucleotides.
1 Assignment
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Accused Products
Abstract
The present invention concerns compositions and processes that use affinity tags for isolating, and detecting or quantifying analytes, including nucleic acids, proteins and polypeptides. Compositions include nucleic acid compositions and protein compositions with affinity binding pairs, including metal binding peptides and immobilized metals, or peptide affinity groups.
41 Citations
85 Claims
- 9. A chimeric nucleic acid comprising at least two portions, a first portion comprising a nucleic acid complementary to a nucleic acid sequence of interest, and a second portion comprising a metal binding peptide, wherein said metal binding peptide is attached to one or more nucleotides of the nucleic acid in said first portion through a sugar or phosphate of said nucleotide or nucleotides.
- 15. A chimeric nucleic acid comprising at least two portions, a first portion comprising a nucleic acid complementary to a nucleic acid sequence of interest, and a second portion comprising one member of a peptide affinity group, wherein said member is attached to one or more nucleotides of said nucleic acid in said first portion.
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20. A process for isolating one or more species of a nucleic acid of interest, comprising the steps of:
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providing; a sample containing or suspected of containing said nucleic acid of interest, a composition which comprises a nucleic acid portion and a first member of an affinity binding pair, wherein said nucleic acid portion comprises sequences complementary to said nucleic acid species of interest, wherein said affinity binding pair comprises (a) a metal binding peptide and an immobilized metal, or (b) a peptide affinity group; and
wherein said first member of the affinity binding pair is attached to one or more nucleotides in said nucleic acid portion; anda matrix comprising a second member of said affinity binding pair; hybridizing said composition with any nucleic acid of interest contained in said sample to form a first complex; contacting said first complex with said matrix to form a second complex by means of a binding interaction between said first member and said second member of the affinity binding pair; and separating bound from unbound material, thereby isolating said nucleic acid species of interest. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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28. A process for detecting the presence or quantity of a nucleic acid of interest, comprising the steps of:
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providing; a sample containing labeled nucleic acids, a composition comprising a nucleic acid portion and a first member of an affinity binding pair, wherein said nucleic acid portion comprises sequences complementary to said nucleic acid of interest, and a matrix comprising a second member of said affinity binding pair; wherein said affinity binding pair comprises (a) a metal binding peptide and an immobilized metal, or (b) a peptide affinity group; and
wherein said first member of the affinity binding pair is attached to one or more nucleotides of said nucleic acid portion; andhybridizing said composition with any nucleic acid of interest contained in said sample to form a first complex; contacting said first complex with said matrix to form a second complex by means of a binding interaction between said first member and said second member of said affinity binding pair; and washing said matrix to remove unhybridized nucleic acids from said matrix; and
detecting or quantifying said nucleic acid of interest by means of detecting or quantifying a signal from said labels. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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37. A process for detecting the presence or quantity of a nucleic acid of interest, comprising the steps of:
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providing; a sample containing or suspected of containing said nucleic acid of interest; a labeled probe complementary to said nucleic acid of interest; a composition comprising a nucleic acid portion and a first member of an affinity binding pair, wherein said nucleic acid portion comprises sequences complementary to said nucleic acid of interest, wherein said affinity binding pair comprises (a) a metal binding peptide and an immobilized metal, or (b) a peptide affinity group, and wherein said first member of the affinity binding pair is attached to one or more nucleotides of said nucleic acid portion through a sugar, phosphate or base of said nucleotide or nucleotides; and a matrix comprising a second member of said affinity binding pair; hybridizing any nucleic acids of interest in said sample with labeled probe and said composition to form a first complex; contacting said first complex with said matrix to form a second complex by means of a binding interaction between said first member and said second member of said affinity binding pair; washing said matrix to remove unbound materials from said sample; and
detecting or quantifying said nucleic acid of interest by means of detecting or quantifying a signal from said labels. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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48. A process for detecting the presence or quantity of a nucleic acid of interest, comprising the steps of:
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providing; a sample containing or suspected of containing said nucleic acid of interest; a probe complementary to said nucleic acid of interest and comprising two portions, wherein a first comprises sequences complementary to said nucleic acid of interest, and a second portion comprising a signal sequence; a composition comprising a nucleic acid portion and a first member of an affinity binding pair, wherein said nucleic acid portion comprises sequences complementary to said nucleic acid of interest, wherein said affinity binding pair comprises (a) a metal binding peptide and an immobilized metal, or (b) a peptide affinity group, and wherein said first member of the affinity binding pair is attached to one or more nucleotides of said nucleic acid; and a matrix comprising a second member of said affinity binding pair; hybridizing any nucleic acids of interest in said sample with labeled probe and said composition to form a first complex; contacting said first complex with said matrix to form a second complex by means of a binding interaction between said one or more binding partners and said affinity peptide; washing said matrix to remove unbound materials from said sample; and
detecting or quantifying said nucleic acid of interest by hybridizing labeled oligonucleotides complementary to said signal sequence. - View Dependent Claims (49, 50, 51, 52, 53)
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54. The process of 48, wherein said signal sequence comprises a heterologous sequence, wherein said heterologous sequence is neither identical or complementary to said nucleic acid of interest.
- 55. A fusion protein comprising a biologically active polypeptide or protein and at least one affinity peptide attached to the amino-terminus or the carboxyl-terminus of said biologically active polypeptide or protein, wherein said affinity peptide comprises at least a portion of the amino acid sequence of kininogen, said portion comprising a metal binding peptide.
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56. A fusion protein comprising a biologically active polypeptide or protein and an affinity peptide attached at the amino-terminus and an affinity peptide attached at the carboxyl-terminus of said biologically active polypeptide or protein, wherein said affinity peptides comprise at least a portion of the amino acid sequence kininogen, said portion comprising a metal binding peptide.
- 62. A fusion protein comprising an antibody linked by its amino- and/or carboxyl-terminus to one or two affinity peptides, wherein said affinity peptide binds to a metal, and wherein said antibody has an affinity to an epitope on a different antibody.
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64. A process for modifying a protein of interest, said process comprising the steps of:
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providing (i) a nucleic acid that codes for said protein of interest; (ii) a nucleic acid that codes for a portion of the amino acid sequence of kininogen, wherein said portion codes for a metal binding peptide; and (iii) an expression vector; adding said nucleic acid (ii) to said nucleic acid (i) to generate a nucleic acid coding for a fusion protein; and inserting said nucleic acid coding for said fusion protein into said expression vector (iii), thereby generating a vector that expresses said modified protein of interest. - View Dependent Claims (65, 66)
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67. A process for isolating a protein of interest, said process comprising the steps of:
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providing;
(i) a nucleic acid that codes for said protein of interest;(ii) a nucleic acid that codes for a portion of the amino acid sequence of kininogen, wherein said portion codes for a metal binding peptide; (iii) an expression vector; and (iv) a metal-modified matrix; adding said nucleic acid (ii) to said nucleic acid (i) to generate a nucleic acid coding for a fusion protein; inserting said nucleic acid coding for said fusion protein into said expression vector (iii), thereby generating a vector that expresses said protein of interest; and purifying said modified protein of interest by binding said protein of interest to said metal-modified matrix (iv). - View Dependent Claims (68, 69, 70)
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71. A fusion protein comprising an antibody and at least one affinity peptide attached to the amino terminus or the carboxyl terminus of said antibody, wherein said affinity peptide comprises a metal binding peptide or is one member of a peptide affinity group, wherein said antibody has an affinity for a different antibody.
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72. A fusion protein comprising an antibody and an affinity peptide attached to the amino terminus and an affinity peptide attached to carboxyl terminus of said antibody, wherein said affinity peptide comprises a metal binding peptide or is one member of a peptide affinity group, wherein said antibody has an affinity for a different antibody.
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73-1. The fusion protein of claim 62, wherein said metal binding peptide comprises oligohistidine or an oligopeptide comprising the sequence HGGHHG (SEQ ID NO:
- 1, SPHHG (SEQ ID NO;
2), SPHHGGSPHHG (SEQ ID NO;
3), HPHHG (SEQ ID NO;
4), HPHHGGHPHHG (SEQ ID NO;
5), SPHHGGHPHHG (SEQ ID NO;
6), HPHHGGSPHHG (SEQ ID NO;
7), KDHLIHNVHKEEHAHAHNK (SEQ ID NO;
8), GHGLGHGHEQQHGLGHGHK (SEQ ID NO;
10) or HGLGHGHEQQHGLGHGH (SEQ ID NO;
9).
- 1, SPHHG (SEQ ID NO;
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74. A process for isolating an analyte of interest, said process comprising the steps of:
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providing (i) a sample containing or suspected of containing said analyte of interest; (ii) a first antibody having an affinity for said analyte; (iii) a fusion antibody comprising; (a) an antibody and at least one affinity peptide attached to the amino terminus or the carboxyl terminus of said antibody, wherein said affinity peptide comprises a metal binding peptide or is one member of a peptide affinity group, wherein said antibody has an affinity for a different antibody;
or(b) an antibody and an affinity peptide attached to the amino terminus and an affinity peptide attached to carboxyl terminus of said antibody, wherein said affinity peptide comprises a metal binding peptide or is one member of a peptide affinity group, wherein said antibody has an affinity for a different antibody; and (iv) a matrix comprising a metal or a second member of said affinity peptide group. contacting said sample with said first antibody, thereby forming a first complex between said first antibody and any analyte present in said sample; contacting said first complex with said fusion antibody, thereby forming a second complex between said first complex and said fusion antibody; contacting said second complex with said matrix to bind said second complex to said matrix; removing unbound material from said matrix, and releasing said analyte of interest from said second complex, thereby isolating said analyte of interest. - View Dependent Claims (75, 76)
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77. A process for detecting or quantifying an analyte of interest, said process comprising the steps of:
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providing (i) a labeled sample containing or suspected of containing labeled analyte of interest; (ii) a first antibody having an affinity for said analyte; (iii) a fusion antibody comprising; (a) an antibody and at least one affinity peptide attached to the amino terminus or the carboxyl terminus of said antibody, wherein said affinity peptide comprises a metal binding peptide or is one member of a peptide affinity group, wherein said antibody has an affinity for a different antibody;
or(b) an antibody and an affinity peptide attached to the amino terminus and an affinity peptide attached to carboxyl terminus of said antibody, wherein said affinity peptide comprises a metal binding peptide or is one member of a peptide affinity group, wherein said antibody has an affinity for a different antibody; and (iv) a matrix comprising a metal or a second member of said affinity peptide group; contacting said sample with said first antibody, thereby forming a first complex between said first antibody and any analyte present in said sample; contacting said first complex with said fusion antibody, thereby forming a second complex between said first complex and said fusion antibody; contacting said second complex with said matrix to bind said second complex to said matrix; removing unbound material from said matrix; and detecting or quantifying said labeled analytes bound to said matrix by means of detecting or quantifying a signal from said labels. - View Dependent Claims (78, 79, 80, 81, 82)
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83. A process for detecting or quantifying an analyte of interest, said process comprising the steps of:
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providing (i) a labeled sample containing or suspected of containing labeled analytes of interest; (ii) a first antibody having an affinity for said analyte; (iii) a fusion antibody comprising; (a) an antibody and at least one affinity peptide attached to the amino terminus or the carboxyl terminus of said antibody, wherein said affinity peptide comprises a metal binding peptide or is one member of a peptide affinity group, wherein said antibody has an affinity for a different antibody;
or(b) an antibody and an affinity peptide attached to the amino terminus and an affinity peptide attached to carboxyl terminus of said antibody, wherein said affinity peptide comprises a metal binding peptide or is one member of a peptide affinity group, wherein said antibody has an affinity for a different antibody; and (iv) a matrix comprising a metal or a second member of said affinity peptide group. forming a first complex among said matrix, said fusion antibody and said first antibody; contacting said first complex with said labeled sample, thereby forming a second complex between said first complex and any labeled analytes that may be present in said sample; removing unbound material from said matrix; and detecting or quantifying said labeled analytes bound to said matrix by means of detecting or quantifying a signal from said labels. - View Dependent Claims (84, 85)
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Specification