Journal
PEPTIDES
Volume 23, Issue 3, Pages 413-418Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/S0196-9781(01)00628-3
Keywords
beta-defensin; synthetic peptides; antibacterial activity; peptide conformation
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Structure and biological activities of synthetic peptides corresponding to bovine neutrophil beta-defensin BNBD-12, GPLSC(1)GRNGGVC(2) IPIRC(3)PVPMRQIGTC(4) FGRPVKC(5) (CRSW)-R-6 with disulfide connectivities C-1-C-5, C-2-C-4 and C-3-C-6 and its variants with one, two and three disulfide bridges have been investigated. Selective protection of cysteine thiols was necessary in the four and six cysteine containing peptides for the formation of disulfide connectivities as observed in BNBD-12. Circular dichroism (CD) spectra indicate that in aqueous medium, only a small fraction of molecules populate turn-like conformations. In the presence of micelles and lipid vesicles, the single, two and three disulfide containing peptides adopt beta-hairpin or beta-sheet structures. Antibacterial activity was observed for all the peptides, irrespective of the number of disulfide bridges or how they were connected. Our results suggest that a rigid beta-sheet structure or the presence of three disulfide bridges does not appear to be stringent requirements for antibacterial activity in beta-defensins. (C) 2002 Elsevier Science Inc. All rights reserved.
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