Chloroalanyl and propargylglycyl dipeptides. Suicide-substrate-containing antibacterials
作者:Kam Sing Cheung、Steven A. Wasserman、Edward Dudek、Stephen A. Lerner、Michael Johnston
DOI:10.1021/jm00366a015
日期:1983.12
A set of dipeptides containing the amino acid residues beta-chloroalanine and propargylglycine, which are mechanism-based inactivators of purified microbial enzymes (alanine racemase and cystathionine gamma-synthase, respectively), have been synthesized, and their antibacterial properties in vitro have been evaluated. Dipeptides containing a single beta-chloro-L-alanyl residue (e.g., 3, 5, 9, and 10)
合成了一组包含氨基酸残基β-氯丙氨酸和炔丙基甘氨酸的二肽,它们是纯化的微生物酶(分别为丙氨酸消旋酶和胱硫醚γ-合酶)的基于机理的失活剂,并已评估了它们的体外抗菌性能。含有单个β-氯-L-丙氨酰基残基(例如3、5、9和10)或单个L-炔丙基糖基残基(例如12和15)的二肽是有效的抗菌剂。通过将这些残基掺入二肽中,β-氯-L-丙氨酸和L-炔丙基甘氨酸的体外抗生素活性可增加多达4000倍。仅包含单个酶灭活氨基酸以及第二个L-丙氨酰基残基(3、5、12和15)的化合物的活性范围有限:仅无乳链球菌,金黄色葡萄球菌和表皮葡萄球菌敏感。然而,含有两个自杀底物残基的肽[例如,β-Cl-LAla-β-Cl-LAla(8)或LppGly-LppGly(18)]是广谱抗菌剂;在被调查的16种物种中,多达12种是敏感物种。含有氨基末端的L-甲硫酰基(9)或L-净戊酰基(10)残基和羧基末端的β-氯-L-丙氨酰基单