Polycationic Gramicidin S Analogues with Both High Antibiotic Activity and Very Low Hemolytic Activity
作者:Makoto Tamaki、Takuji Harada、Kenta Fujinuma、Kazumasa Takanashi、Mitsuno Shindo、Masahiro Kimura、Yoshiki Uchida
DOI:10.1248/cpb.c12-00290
日期:——
The substitution of each constituent amino acid residue of gramicidin S (GS), cyclo(-Val1,1′-Orn2,2′-Leu3,3′-D-Phe4,4′-Pro5,5′-)2 with Lys residue indicated that each side chain structure of the constituent amino acid residues affect largely the antibiotic activity and hemolytic activity of GS. Further, the substitution of D-Phe4,4′ and Pro5,5′ residues with basic amino acid residues as a Lys residue results the high antibiotic activity and the very low hemolytic activity. Thus, we have found novel positions on the scaffold of GS at D-Phe4,4′ and Pro5,5′ residues whose modification will significantly increase the therapeutic index.
将短杆菌肽 S(GS)的每个组成氨基酸残基(cyclo(-Val1,1′-Orn2,2′-Leu3,3′-D-Phe4,4′-Pro5,5′-)2)替换为赖氨酸残基表明,组成氨基酸残基的每个侧链结构都会极大地影响 GS 的抗生素活性和溶血活性。此外,将 D-Phe4,4′ 和 Pro5,5′ 残基替换为碱性氨基酸残基(如赖氨酸残基)会产生高抗生素活性,而溶血活性极低。因此,我们在 GS 支架上的 D-Phe4,4′ 和 Pro5,5′ 残基上发现了新的位置,对其进行修改将显著提高治疗指数。