Please use this identifier to cite or link to this item: https://repositorio.unifesp.br/handle/11600/37815
Title: Structure-activity relationship of Trp-containing analogs of the antimicrobial peptide gomesin
Authors: Domingues, Tatiana Moreira [UNIFESP]
Buri, Marcus V. [UNIFESP]
Daffre, Sirlei
Campana, Patricia T.
Riske, Karin A. [UNIFESP]
Miranda, Antonio [UNIFESP]
Universidade Federal de São Paulo (UNIFESP)
Universidade de São Paulo (USP)
Keywords: gomesin
antimicrobial peptide
fluorescence
circular dichroism
absorbance
Issue Date: 1-Jun-2014
Publisher: Wiley-Blackwell
Citation: Journal of Peptide Science. Hoboken: Wiley-Blackwell, v. 20, n. 6, p. 421-428, 2014.
Abstract: Gomesin (Gm) has a broad antimicrobial activity making it of great interest for development of drugs. in this study, we analyzed three Gm analogs, [Trp(1)]-Gm, [Trp(7)]-Gm, and [Trp(9)]-Gm, in an attempt to gain insight into the contributions of different regions of the peptide sequence to its activity. the incorporation of the tryptophan residue in different positions has no effect on the antimicrobial and hemolytic activities of the Gm analogs in relation to Gm. Spectroscopic studies (circular dichroism, fluorescence and absorbance) of Gm and its analogs were performed in the presence of SDS, below and above its critical micelle concentration (CMC) (similar to 8mM), in order to monitor structural changes induced by the interaction with this anionic surfactant (0-15mM). Interestingly, we found that the analogs interact more strongly with SDS at low concentrations (0.3-6.0mM) than close to or above its CMC. This suggests that SDS monomers are able to cover the whole peptide, forming large detergent-peptide aggregates. On the other hand, the peptides interact differently with SDS micelles, inserting partially into the micelle core. Among the peptides, Trp in position 1 becomes more motionally-restricted in the presence of SDS, probably because this residue is located at the N-terminal region, which presents higher conformational freedom to interact stronger with SDS molecules. Trp residues in positions 7 and 9, close to and in the region of the turn of the molecule, respectively, induced a more constrained structure and the compounds cannot insert deeper into the micelle core or be completely buried by SDS monomers. Copyright (c) 2014 European Peptide Society and John Wiley & Sons, Ltd.
URI: http://repositorio.unifesp.br/handle/11600/37815
ISSN: 1075-2617
Other Identifiers: http://dx.doi.org/10.1002/psc.2632
Appears in Collections:Em verificação - Geral

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.