New Antimicrobial Hexapeptides: Synthesis, Antimicrobial Activities, Cytotoxicity, and Mechanistic Studies
作者:Rohitâ
K. Sharma、Sandeep Sundriyal、Nishima Wangoo、Werner Tegge、Rahul Jain
DOI:10.1002/cmdc.200900330
日期:2010.1.4
depending on the hydrophobic or positive‐charge character of residues at various positions along the sequence. The hexapeptide was also cyclized to study the correlation between the linear and cyclic structures and their respective antimicrobial activities. The synthesized peptides were found to be active against the fungus Candida albicans and Gram‐positive bacteria such as methicillin‐resistant Staphylococcus
合成的抗菌肽最近已成为抗药性病原体的有前途的候选药物。我们鉴定了新的六肽,Orn- d -Trp- d -Phe-Ile- d -Phe-His的(1-BZL)-NH 2,其表现出广谱抗真菌和抗菌活性。根据序列中各个位置残基的疏水性或正电荷特性,对各种蛋白原性和非蛋白原性氨基酸进行全氨基酸扫描,从而进行了前导优化。六肽也被环化以研究线性和环状结构与它们各自的抗菌活性之间的相关性。发现合成的肽对真菌具有活性白色念珠菌和革兰氏阳性细菌,例如耐甲氧西林的金黄色葡萄球菌和表皮耐甲氧西林的葡萄球菌,以及革兰氏阴性细菌大肠杆菌;对于最有效的结构MIC值在1-5微克mL范围-1(IC 50倍在0.02-2微克mL范围内的值-1)。在最高200μgmL -1的最高测试浓度下,大多数合成的肽在MTT分析中均无细胞毒性作用。在分别模拟细菌和哺乳动物膜的带负电荷和两性离子模型膜的存在下进行了色氨酸荧光猝灭研究。