Download MendeleyAntibiotic activity and structural analysis of the scorpion-derived antimicrobial peptide IsCT and its analogs
Lee, K., Shin, S.Y., Kim, K., Lim, S.S., Hahm, K.S., Kim, Y.(2004) Biochem Biophys Res Commun 323: 712-719
- PubMed: 15369808
- DOI: https://doi.org/10.1016/j.bbrc.2004.08.144
- Primary Citation of Related Structures:
1T51, 1T52, 1T54, 1T55 - PubMed Abstract:
IsCT is a non-cell-selective antimicrobial peptide isolated from the scorpion Opisthacanthus madagascariensis that has potent cytolytic activity against both mammalian and bacterial cells. To investigate the structure-activity relationships of IsCT and to design novel peptide antibiotics with bacterial cell selectivity, we synthesized several analogs of IsCT and determined their three-dimensional structures in solution by 2D-NMR spectroscopy. IsCT has a linear alpha-helical structure from Gly3 to Phe13, and [K7]-IsCT has a linear alpha-helical structure from Leu2 to Phe13. [K7, P8, K11]-IsCT, which has a bend in its middle region, exhibited the highest antibacterial activity without hemolytic activity, suggesting that its proline-induced bend is an important determinant of this selectivity. Tryptophan fluorescence showed that the high selectivity of [K7, P8, K11]-IsCT toward bacterial cells is closely correlated with its highly selective interaction with negatively charged phospholipids. Its potent activity against antibiotic-resistant bacteria suggests that [K7, P8, K11]-IsCT may serve as a promising lead candidate in the development of new peptide antibiotics.
Organizational Affiliation:
Department of Chemistry and Bio/Molecular Informatics Center, Konkuk University, Seoul 143-701, Republic of Korea.
