Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/76828
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Type: Journal article
Title: Structural and activity changes in three bioactive anuran peptides when Asp is replaced by isoAsp
Author: Calabrese, A.
Markulic, K.
Musgrave, I.
Guo, H.
Zhang, L.
Bowie, J.
Citation: Peptides, 2012; 38(2):427-436
Publisher: Elsevier Science Inc
Issue Date: 2012
ISSN: 0196-9781
1873-5169
Statement of
Responsibility: 
Antonio N. Calabrese, Katarina Markulic, Ian F. Musgrave, Hui Guo, Lixin Zhang, John H. Bowie
Abstract: The Asp and isoAsp isomers of three bioactive peptides, Crinia angiotensin 11 [APGDRIYHPF(OH)], uperin 1.1 [pEADPNAFYGLM(NH(2))] and citropin 1.1 [GLFDVIKKVASVIGGL(NH(2))] were tested for changes in (i) susceptibility towards proteolytic cleavage, (ii) activity (smooth muscle activity for Crinia angiotensin 11 and uperin 1.1 isomers, and antimicrobial activity for the two isomers of citropin 1.1), and (iii) 3D structures in water, trifluoroethanol-d(3)/water (1:1) and DPC micelles as determined by 2D nuclear magnetic resonance spectroscopy. Proteolytic cleavage with trypsin was identical for each pair of Asp/isoAsp isomers. Cleavage with chymotrypsin was the same for the Crinia angiotensin and uperin 1.1 isomeric pairs, but different for the two Asp/isoAsp citropin 1.1 isomers. Chymotrypsin cleaved at Phe3 (adjacent to Asp4) for citropin 1.1, but not at Phe3 (adjacent to isoAsp4) for isoAsp citropin 1.1. The smooth muscle activity of the isoAsp isomer of Crinia angiotensin 11 was less than that of the Asp isomer. The smooth muscle activity of isoAsp3-uperin 1.1 is greater than that of the Asp isomer at low concentration (<10(-9)M) but no different from the Asp isomer at concentrations>10(-9) M. Citropin 1.1 is a wide-spectrum antibiotic against Gram positive organisms, while the isoAsp isomer is inactive against the test pathogens Staphylococcus aureus and Bacillus subtilis. The observed changes in activity are accompanied by changes in the 3D structures of isomers as determined by 2D nuclear magnetic resonance spectroscopy.
Keywords: Asp and isoAsp isomers
Crinia angiotensin 11
Uperin 1.1
Citropin 1.1
Proteolytic cleavage
Activity (smooth muscle or antimicrobial)
3D structures by nuclear magnetic
resonance
Rights: © 2012 Elsevier Inc. All rights reserved.
DOI: 10.1016/j.peptides.2012.10.001
Grant ID: ARC
Published version: http://dx.doi.org/10.1016/j.peptides.2012.10.001
Appears in Collections:Aurora harvest 4
Chemistry and Physics publications

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