Abstract
The formation of local structure, in short peptides has been probed by examining cleavage patterns and rates of proteolysis of designed sequences with a high tendency to form β-hairpin structures. Three model sequences which bear fluorescence donor and acceptor groups have been investigated: Dab-Gaba-Lys-Pro-Leu-Gly-Lys-Val-Xxx-Yyy-Glu-Val-Ala-Ala-Cys-Lys-NH2 ï EDANS Xxx-Yyy: Peptide 1=DPro-LPro, Peptide 2=DPro-Gly, Peptide 3=Leu-Ala Fluorescence resonance energy transfer (FRET) provides a convenient probe for peptide cleavage. MALDI mass spectrometry has been used to probe sites of cleavage and CD spectroscopy to access the overall backbone conformation using analog sequences, which lack strongly absorbing donor and acceptor groups. The proteases trypsin, subtilisin, collagenase, elastase, proteinase K and thermolysin were used for proteolysis and the rates of cleavage determined. Peptide 3 is the most susceptible to cleavage by all the enzymes except thermolysin, which cleaves all three peptides at comparable rates. Peptides 1 and 2 are completely resistant to the action of trypsin, suggesting that β-turn formation acts as a deterrent to proteolytic cleavage.
Keywords: Fluorescent protease substrate, fluorescence resonance energy transfer, mass spectrometry, circular dichroism, β-hairpin peptide, β- turn, proteases
Protein & Peptide Letters
Title: Structure Formation in Short Designed Peptides Probed by Proteolytic Cleavage
Volume: 13 Issue: 5
Author(s): Yegnisettipalli K. Saikumari, Gudihal Ravindra and Padmanabhan Balaram
Affiliation:
Keywords: Fluorescent protease substrate, fluorescence resonance energy transfer, mass spectrometry, circular dichroism, β-hairpin peptide, β- turn, proteases
Abstract: The formation of local structure, in short peptides has been probed by examining cleavage patterns and rates of proteolysis of designed sequences with a high tendency to form β-hairpin structures. Three model sequences which bear fluorescence donor and acceptor groups have been investigated: Dab-Gaba-Lys-Pro-Leu-Gly-Lys-Val-Xxx-Yyy-Glu-Val-Ala-Ala-Cys-Lys-NH2 ï EDANS Xxx-Yyy: Peptide 1=DPro-LPro, Peptide 2=DPro-Gly, Peptide 3=Leu-Ala Fluorescence resonance energy transfer (FRET) provides a convenient probe for peptide cleavage. MALDI mass spectrometry has been used to probe sites of cleavage and CD spectroscopy to access the overall backbone conformation using analog sequences, which lack strongly absorbing donor and acceptor groups. The proteases trypsin, subtilisin, collagenase, elastase, proteinase K and thermolysin were used for proteolysis and the rates of cleavage determined. Peptide 3 is the most susceptible to cleavage by all the enzymes except thermolysin, which cleaves all three peptides at comparable rates. Peptides 1 and 2 are completely resistant to the action of trypsin, suggesting that β-turn formation acts as a deterrent to proteolytic cleavage.
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Cite this article as:
Saikumari K. Yegnisettipalli, Ravindra Gudihal and Balaram Padmanabhan, Structure Formation in Short Designed Peptides Probed by Proteolytic Cleavage, Protein & Peptide Letters 2006; 13 (5) . https://dx.doi.org/10.2174/092986606776819501
DOI https://dx.doi.org/10.2174/092986606776819501 |
Print ISSN 0929-8665 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-5305 |
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