The Contribution of theN-Terminal Structure of Polymyxin B Peptides to Antimicrobial and Lipopolysaccharide Binding Activity
摘要:
为了阐明多粘菌素 B 多肽 N 端结构与活性的关系,合成了 7 种已阐明其结构的多粘菌素 B 成分肽和 7 种 N 端脂肪酸和/或氨基酸缺失类似物,并测定了它们的抗菌活性。使用[Dab(Dansyl-Gly)1]-多粘菌素 B3(Dab;l-α,γ-二氨基丁酸)作为荧光探针,评估了合成肽的脂多糖(LPS)结合活性。结果表明,脂肪酰基对于 LPS 结合并非不可或缺,但多粘菌素 B 肽的 C9 脂肪酰基对结合亲和力的贡献略大于 C8 或 C7。多粘菌素 B 的脂肪酰基对抗菌活性有很大贡献,而多粘菌素 B1-B6 不同的 N 端结构(含有正常脂肪酸、异脂肪酸、反异脂肪酸或链长在 C7 和 C9 之间的 3-羟基脂肪酸)并不影响杀菌效力。
Compounds of formula (I), salts thereof, and compositions and uses thereof are described. The compounds are useful as V1a vasopressin agonists, for the treatment of, e.g., complications of cirrhosis, including bacterial peritonitis, HRS2 and refractory ascites.
[EN] BETA-HAIRPIN PEPTIDOMIMETICS<br/>[FR] PEPTIDOMIMÉTIQUES EN ÉPINGLE À CHEVEUX BÊTA
申请人:POLYPHOR AG
公开号:WO2016150576A1
公开(公告)日:2016-09-29
Beta-hairpin peptidomimetics of the general formula (I), and pharmaceutically acceptable salts thereof, with P, T, Q., and optionally L being elements as defined in the description and the claims, have Gram-negative antimicrobial activity to e.g. inhibit the growth or to kill microorganisms such as Klebsiellapneumoniae and/or Acinetobacter baumannii and/or Escherichia coli and/or Pseudomonas aeruginosa. They ca n be used as medicaments to treat or prevent infections or as disinfectants for foodstuffs, cosmetics, medicaments or other nutrient-containing materials. These peptidomimetics can be manufactured by a process which is based on a mixed solid- and solution phase synthetic strategy.
Characterization of the Polymyxin D Synthetase Biosynthetic Cluster and Product Profile of <i>Paenibacillus polymyxa</i> ATCC 10401
作者:Charles A. Galea、Meiling Han、Yan Zhu、Kade Roberts、Jiping Wang、Philip E. Thompson、Jian L、Tony Velkov
DOI:10.1021/acs.jnatprod.6b00807
日期:2017.5.26
catalyzes the conversion of l-Ser to the d-form. Structural modeling suggested that the adenylation domains of module 3 in PmxE and modules 6 and 7 in PmxA could bind aminoacids with larger side chains than their preferred substrate. Feeding individual aminoacids into the culture media not only affected production of polymyxins D1 and D2 but also led to the incorporation of different aminoacids at positions
analogues of trypsininhibitor SFTI-1 was synthesized by the solid phase method. In these analogues disulfidebridge Cys3 - Cys11 present in native inhibitor was replaced by different-sized carbonyl bridges formed by the amino groups of the side chain of Lys, Orn, Dab or Dap located in positions 3 and/or 11. All analogues appeared to be potent trypsininhibitors. The values of association equilibrium
Biocompatible and Selective Generation of Bicyclic Peptides**
作者:Sven Ullrich、Josemon George、Alexandra E. Coram、Richard Morewood、Christoph Nitsche
DOI:10.1002/anie.202208400
日期:2022.10.24
Bicyclicpeptides are increasingly popular in drug discovery; however, only few strategies for their synthesis exist. Dicyanopyridine-featured amino acids provide a biocompatible, selective, and catalyst-free pathway to access bicyclicpeptides, which are characterized by superior preorganization and high target affinity.