Cleavage resistant photoluminescent proteins and applications thereof
First Claim
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1. A photoluminescent protein comprising:
- an amino acid sequence having an absence of internal methionine residues, wherein each internal methionine residue is substituted with an amino acid inert to cyanogen bromide (CNBr), and at least three internal methionine residues are each substituted by a leucine residue.
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Abstract
Photoluminescent proteins resistant to protein cleavage reagents are described herein. In being resistant to cleavage reagents, such photoluminesncent proteins can reduce the number of digestion or cleavage products, thereby simplifying quantification and purification of recombinant protein compositions. In some embodiments, a photoluminescent protein described herein comprises an amino acid sequence having an absence of internal methionine residues.
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Citations
19 Claims
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1. A photoluminescent protein comprising:
an amino acid sequence having an absence of internal methionine residues, wherein each internal methionine residue is substituted with an amino acid inert to cyanogen bromide (CNBr), and at least three internal methionine residues are each substituted by a leucine residue. - View Dependent Claims (2, 3, 4, 7, 16, 17, 18)
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5. A recombinant protein composition comprising:
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a first amino acid sequence of a target protein; and a photoluminescent protein coupled to the first amino acid sequence, the photoluminescent protein comprising an amino acid sequence having an absence of internal methionine residues, wherein each internal methionine residue is substituted with an amino acid inert to CNBr and at least three of the substituted amino acids is leucine. - View Dependent Claims (6, 8, 13, 14, 15)
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9. A method of purifying recombinant protein composition comprising:
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providing a mixture including the recombinant protein composition, the recombinant protein composition comprising a first amino acid sequence of a target protein and a photoluminescent protein coupled to the first amino acid sequence, the photoluminescent protein including an amino acid sequence having an absence of internal methionine residues; and treating the recombinant protein composition with CNBr to release the recombinant protein from an intact photoluminescent protein. - View Dependent Claims (10, 11, 12)
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19. A photoluminescent protein comprising:
an amino acid sequence having an absence of internal methionine residues, wherein internal methionine residues are substituted with amino acids inert to cyanogen bromide (CNBr), and the photoluminescent protein retains photoluminescent intensity of an unsubstituted photoluminescent protein comprising the internal methionine residues.
Specification