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Total Syntheses of Bulgecins A, B, and C and Their Bactericidal Potentiation of the β-Lactam Antibiotics.
ACS Infectious Diseases ( IF 4.0 ) Pub Date : 2018-05-07 , DOI: 10.1021/acsinfecdis.8b00105
Shusuke Tomoshige 1 , David A Dik 1 , Masaaki Akabane-Nakata 1 , Chinedu S Madukoma 2 , Jed F Fisher 1 , Joshua D Shrout 2, 3 , Shahriar Mobashery 1
Affiliation  

The bulgecins are iminosaccharide secondary metabolites of the Gram-negative bacterium Paraburkholderia acidophila and inhibitors of lytic transglycosylases of bacterial cell-wall biosynthesis and remodeling. The activities of the bulgecins are intimately intertwined with the mechanism of a cobiosynthesized β-lactam antibiotic. β-Lactams inhibit the penicillin-binding proteins, enzymes also critical to cell-wall biosynthesis. The simultaneous loss of the lytic transglycosylase (by bulgecin) and penicillin-binding protein (by β-lactams) activities results in deformation of the septal cell wall, observed microscopically as a bulge preceding bacterial cell lysis. We describe a practical synthesis of the three naturally occurring bulgecin iminosaccharides and their mechanistic evaluation in a series of microbiological studies. These studies identify potentiation by the bulgecin at subminimum inhibitory concentrations of the β-lactam against three pathogenic Gram-negative bacteria and establish for the first time that this potentiation results in a significant increase in the bactericidal efficacy of a clinical β-lactam.

中文翻译:


Bulgecins A、B 和 C 的全合成及其对 β-内酰胺抗生素的杀菌增强作用。



bulgecins 是革兰氏阴性细菌嗜酸副伯克霍尔德氏菌的亚氨基糖次级代谢物,也是细菌细胞壁生物合成和重塑的溶解性转糖基酶的抑制剂。 bulgecins 的活性与共生物合成的 β-内酰胺抗生素的机制密切相关。 β-内酰胺抑制青霉素结合蛋白,这种酶对细胞壁生物合成也至关重要。裂解性转糖基酶(bulgecin)和青霉素结合蛋白(β-内酰胺)活性的同时丧失导致隔膜细胞壁变形,在显微镜下观察到细菌细胞裂解前的凸起。我们描述了三种天然存在的 bulgecin 亚氨基糖的实际合成及其在一系列微生物学研究中的机理评估。这些研究确定了 bulgecin 在 β-内酰胺亚最低抑制浓度下对三种致病性革兰氏阴性菌的增强作用,并首次证实这种增强作用导致临床 β-内酰胺的杀菌功效显着增加。
更新日期:2018-05-01
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