ジャーナル: Nat Microbiol / 年: 2022 タイトル: Computational identification of a systemic antibiotic for gram-negative bacteria. 著者: Ryan D Miller / Akira Iinishi / Seyed Majed Modaresi / Byung-Kuk Yoo / Thomas D Curtis / Patrick J Lariviere / Libang Liang / Sangkeun Son / Samantha Nicolau / Rachel Bargabos / Madeleine ...著者: Ryan D Miller / Akira Iinishi / Seyed Majed Modaresi / Byung-Kuk Yoo / Thomas D Curtis / Patrick J Lariviere / Libang Liang / Sangkeun Son / Samantha Nicolau / Rachel Bargabos / Madeleine Morrissette / Michael F Gates / Norman Pitt / Roman P Jakob / Parthasarathi Rath / Timm Maier / Andrey G Malyutin / Jens T Kaiser / Samantha Niles / Blake Karavas / Meghan Ghiglieri / Sarah E J Bowman / Douglas C Rees / Sebastian Hiller / Kim Lewis / 要旨: Discovery of antibiotics acting against Gram-negative species is uniquely challenging due to their restrictive penetration barrier. BamA, which inserts proteins into the outer membrane, is an ...Discovery of antibiotics acting against Gram-negative species is uniquely challenging due to their restrictive penetration barrier. BamA, which inserts proteins into the outer membrane, is an attractive target due to its surface location. Darobactins produced by Photorhabdus, a nematode gut microbiome symbiont, target BamA. We reasoned that a computational search for genes only distantly related to the darobactin operon may lead to novel compounds. Following this clue, we identified dynobactin A, a novel peptide antibiotic from Photorhabdus australis containing two unlinked rings. Dynobactin is structurally unrelated to darobactins, but also targets BamA. Based on a BamA-dynobactin co-crystal structure and a BAM-complex-dynobactin cryo-EM structure, we show that dynobactin binds to the BamA lateral gate, uniquely protruding into its β-barrel lumen. Dynobactin showed efficacy in a mouse systemic Escherichia coli infection. This study demonstrates the utility of computational approaches to antibiotic discovery and suggests that dynobactin is a promising lead for drug development.
Dynobactin A is a decapeptide (1-WNSNVHSYRF-10) with 2 closed rings. One carbon-carbon bond formed ...Dynobactin A is a decapeptide (1-WNSNVHSYRF-10) with 2 closed rings. One carbon-carbon bond formed between the C6 of Trp (W1) and the beta-carbon of Asn (N4). Second an unusual nitrogen-carbon linkage formed between the imidazole N-Epsilon-2 of His (H6) and the beta-carbon of Tyr (Y8).
研究の焦点であるリガンドがあるか
Y
-
実験情報
-
実験
実験
手法: X線回折 / 使用した結晶の数: 1
-
試料調製
結晶
マシュー密度: 3.12 Å3/Da / 溶媒含有率: 60.59 %
結晶化
温度: 298 K / 手法: 蒸気拡散法 詳細: 0.12 M lithium sulfate, 0.02 M Tris pH7.5, 0.1 M sodium citrate pH 5.0, and 20% (v/v) PEG300
解像度: 2.5→48.36 Å / Cor.coef. Fo:Fc: 0.884 / Cor.coef. Fo:Fc free: 0.906 / 交差検証法: THROUGHOUT / σ(F): 0 / SU R Blow DPI: 0.406 / SU Rfree Blow DPI: 0.27 詳細: HYDROGENS WERE FULLY REFINED WITH ZERO OCCUPANCY AT NUCLEAR POSITION. REFINEMENT NOTES. NUMBER OF REFINEMENT NOTES : 1 NOTE 1 : IDEAL-DIST CONTACT TERM CONTACT SETUP. ALL ATOMS HAVE CCP4 ATOM TYPE FROM LIBRARY