A structure involving the absolute configuration of acinetobactin (1b) was clarified. It was reconfirmed that preacinetobactin (1a) produced 1b by a rearrangement reaction.
Rigid Oxazole Acinetobactin Analog Blocks Siderophore Cycling in <i>Acinetobacter baumannii</i>
作者:Tabbetha J. Bohac、Justin A. Shapiro、Timothy A. Wencewicz
DOI:10.1021/acsinfecdis.7b00146
日期:2017.11.10
The emergence of multidrug resistant (MDR) Gram-negative bacterial pathogens has raised global concern. Nontraditional therapeutic strategies, including antivirulence approaches, are gaining traction as a means of applying less selective pressure for resistance in vivo. Here, we show that rigidifying the structure of the siderophore preacinetobactin from MDR Acinetobacter baumannii via oxidation of
Synthesis and Characterization of Anguibactin To Reveal Its Competence To Function as a Thermally Stable Surrogate Siderophore for a Gram-Negative Pathogen, <i>Acinetobacter baumannii</i>
作者:Haeun Lee、Woon Young Song、Minju Kim、Min Wook Lee、Soojeung Kim、Ye Song Park、Kyungwon Kwak、Man Hwan Oh、Hak Joong Kim
DOI:10.1021/acs.orglett.8b02789
日期:2018.10.19
Totalsynthesis of anguibactin was accomplished for the first time, and the following biochemical characterizations allowed for the determination of its Fe(III) binding mode as well as the demonstration of its iron delivery capability for Acinetobacter baumannii. These properties, in addition to the thermal stability over acinetobactin, render anguibactin as a competent surrogate siderophore that can
A Latent Oxazoline Electrophile for N−O−C Bond Formation in Pseudomonine Biosynthesis
作者:Elizabeth S. Sattely、Christopher T. Walsh
DOI:10.1021/ja804499r
日期:2008.9.17
Nitrogen-heteroatom bonds figure prominently in the structural, chemical, and functional diversity of natural products. In the case of Pseudomonas siderophore pseudomonine, an N-O hydroxamate linkage is found uncommonly configured in an isoxazolidinone ring. In an effort to understand the biogenesis of this heterocycle, we have characterized the pseudomonine synthetase in vitro and reconstituted the complete biosynthetic pathway. Our results indicate that the isoxazolidinone of pseudomonine arises from spontaneous rearrangement of an oxazoline precursor. To the best of our knowledge, this is a previously uncharacterized mode of post-assembly line heterocyclization. Our results establish the oxygen of the ubiquitous siderophore hydroxamate functionality as a nucleophile and may be indicative of general strategy for N-O-C bond formation in nature.