Acid-cleavable linkers exhibiting altered rates of acid hydrolysis
First Claim
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1. A method of preparing at least one peptide of interest (“
- POI”
) from a fusion peptide comprising at least one POI, comprising;
a) providing a recombinant cell synthesizing a fusion peptide having the structure
PEP1-L-PEP2wherein,i) PEP1 and PEP2 are independently functional peptides wherein at least one is a peptide of interest (“
POI”
); and
ii) L is an acid-cleavable linker comprising a peptidewherein D is aspartic acid and P is proline;
b) contacting the fusion peptide with a solution of sufficiently acidic pH so that linker L is cleaved, andc) isolating the at least one POI.
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Abstract
An acid-cleavable peptide linker comprising aspartic acid and proline residues is disclosed. The acid-cleavable peptide linker provides an altered sensitivity to acid-hydrolytic release of peptides of interest from fusion peptides of the formula PEP1-L-PEP2. The inventive linker, L, is described in various embodiments, each of which provides substantially more rapid acid-release of peptides of interest than does a single aspartic acid-proline pair. In an additional aspect, a method of increasing the stability of an acid cleavable linkage to acid hydrolysis is also provided.
76 Citations
41 Claims
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1. A method of preparing at least one peptide of interest (“
- POI”
) from a fusion peptide comprising at least one POI, comprising;a) providing a recombinant cell synthesizing a fusion peptide having the structure
PEP1-L-PEP2wherein, i) PEP1 and PEP2 are independently functional peptides wherein at least one is a peptide of interest (“
POI”
); andii) L is an acid-cleavable linker comprising a peptide wherein D is aspartic acid and P is proline; b) contacting the fusion peptide with a solution of sufficiently acidic pH so that linker L is cleaved, and c) isolating the at least one POI. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- POI”
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20. A fusion peptide comprising two peptides separated by an acid-cleavable linker according to the following general formula
PEP1-L-PEPwherein, a) PEP1 and PEP2 are independently functional peptides wherein at least one is a peptide of interest (“ - POI”
); andb) L is an acid-cleavable linker comprising a peptide wherein D is aspartic acid and P is proline. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
- POI”
-
37. A recombinant cell expressing a fusion protein having the structure
PEP1-L-PEP2wherein, i) PEP1 and PEP2 are independently functional peptides, one of which is a POI; - and
ii) L is an acid-cleavable linker comprising a peptide wherein D is aspartic acid and P is proline; and wherein the expressed fusion peptide is present in the recombinant cell. - View Dependent Claims (38, 39, 40)
- and
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41. An acid-cleavable peptide linker comprising a peptide
wherein D is aspartic acid and P is proline.
Specification