Method for engineering proteases and protein kinases
First Claim
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1. A nucleic acid vector for engineering protease variants, wherein the nucleic acid vector encodes two separately expressed fusion proteins, wherein the first fusion protein comprise, in an N- to C-terminal direction:
- (i) a first endoplasmic reticulum (ER) targeting sequence;
(ii) a surface expression sequence;
(iii) a first peptide sequence that is a counterselection substrate sequence for the enzyme of the second fusion protein;
(iv) a first epitope tag sequence;
(v) a second peptide sequence that is a selection substrate sequence for the enzyme of the second fusion protein;
(vi) a second epitope tag sequence; and
(vii) a first endoplasmic reticulum (ER) retention sequence,wherein the second fusion protein comprises, in an N- to C-terminal direction;
(viii) a second endoplasmic reticulum (ER) targeting sequence;
(ix) an enzyme, wherein the enzyme is a protease; and
(x) a second endoplasmic reticulum (ER) retention sequence.
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Abstract
Provided are methods for protein engineering, such as engineering proteases or kinases. The methods may utilize yeast display and/or ER sequestration of proteins or substrates. In some aspects, TEV proteases with altered substrate specificity, potency, and/or efficiency are provided.
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Citations
84 Claims
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1. A nucleic acid vector for engineering protease variants, wherein the nucleic acid vector encodes two separately expressed fusion proteins, wherein the first fusion protein comprise, in an N- to C-terminal direction:
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(i) a first endoplasmic reticulum (ER) targeting sequence; (ii) a surface expression sequence; (iii) a first peptide sequence that is a counterselection substrate sequence for the enzyme of the second fusion protein; (iv) a first epitope tag sequence; (v) a second peptide sequence that is a selection substrate sequence for the enzyme of the second fusion protein; (vi) a second epitope tag sequence; and (vii) a first endoplasmic reticulum (ER) retention sequence, wherein the second fusion protein comprises, in an N- to C-terminal direction; (viii) a second endoplasmic reticulum (ER) targeting sequence; (ix) an enzyme, wherein the enzyme is a protease; and (x) a second endoplasmic reticulum (ER) retention sequence. - 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, 29, 30, 31, 32, 33, 34)
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35. A nucleic acid vector for engineering protease and substrate variants, wherein the nucleic acid vector encodes two separately expressed fusion proteins, wherein the first fusion protein comprises, in an N- to C-terminal direction:
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(i) a first endoplasmic reticulum (ER) targeting sequence; (ii) a surface expression sequence; (iii) a first epitope tag sequence; (iv) a first peptide sequence that is a selection substrate sequence for the enzyme of the second fusion protein; (v) a second epitope tag sequence; (vi) a second peptide sequence that is a counterselection substrate sequence for the enzyme of the second fusion protein; (vii) a third epitope tag sequence; and (viii) a first endoplasmic reticulum (ER) retention sequence, wherein the second fusion protein comprises, in an N- to C-terminal direction; (ix) a second endoplasmic reticulum (ER) targeting sequence; (x) an enzyme, wherein the enzyme is a protease; and (xi) a second endoplasmic reticulum (ER) retention sequence. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
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64. A nucleic acid vector for engineering kinase variants, wherein the nucleic acid vector encodes two separately expressed fusion proteins, wherein the first fusion protein comprises, in an N- to C-terminal direction:
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(i) a first endoplasmic reticulum (ER) targeting sequence; (ii) a surface expression sequence; (ii) an epitope tag sequence and a peptide sequence that is a selection substrate sequence for the enzyme of the second fusion protein; and (iii) a first endoplasmic reticulum (ER) retention sequence, wherein the second fusion protein comprises, in an N- to C-terminal direction; (iv) a second endoplasmic reticulum (ER) targeting sequence; (ix) an enzyme, wherein the enzyme is a protein kinase; and (x) a second endoplasmic reticulum (ER) retention sequence. - View Dependent Claims (65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84)
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Specification