5E3J

The response regulator RstA is a potential drug target for Acinetobacter baumannii

5E3J の概要

• エントリーDOI: 10.2210/pdb5e3j/pdb
• 分子名称: Response regulator RstA (2 entities in total)
• 機能のキーワード: response regulator, acinetobacter baumannii, essential gene, antibiotic target, transcription
• 由来する生物種: Acinetobacter baumannii
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 30056.73

構造登録者

Russo, T.A.,Manohar, A.,Beanan, J.M.,Olson, R.,MacDonald, U.,Graham, J.,Umland, T.C. (登録日: 2015-10-02, 公開日: 2016-05-04, 最終更新日: 2023-09-27)

主引用文献

Russo, T.A.,Manohar, A.,Beanan, J.M.,Olson, R.,MacDonald, U.,Graham, J.,Umland, T.C.
The Response Regulator BfmR Is a Potential Drug Target for Acinetobacter baumannii.
Msphere, 1:-, 2016

PubMed Abstract: Identification and validation is the first phase of target-based antimicrobial development. BfmR (RstA), a response regulator in a two-component signal transduction system (TCS) in Acinetobacter baumannii, is an intriguing potential antimicrobial target. A unique characteristic of BfmR is that its inhibition would have the dual benefit of significantly decreasing in vivo survival and increasing sensitivity to selected antimicrobials. Studies on the clinically relevant strain AB307-0294 have shown BfmR to be essential in vivo. Here, we demonstrate that this phenotype in strains AB307-0294 and AB908 is mediated, in part, by enabling growth in human ascites fluid and serum. Further, BfmR conferred resistance to complement-mediated bactericidal activity that was independent of capsular polysaccharide. Importantly, BfmR also increased resistance to the clinically important antimicrobials meropenem and colistin. BfmR was highly conserved among A. baumannii strains. The crystal structure of the receiver domain of BfmR was determined, lending insight into putative ligand binding sites. This enabled an in silico ligand binding analysis and a blind docking strategy to assess use as a potential druggable target. Predicted binding hot spots exist at the homodimer interface and the phosphorylation site. These data support pursuing the next step in the development process, which includes determining the degree of inhibition needed to impact growth/survival and the development a BfmR activity assay amenable to high-throughput screening for the identification of inhibitors. Such agents would represent a new class of antimicrobials active against A. baumannii which could be active against other Gram-negative bacilli that possess a TCS with shared homology. IMPORTANCE Increasing antibiotic resistance in bacteria, particularly Gram-negative bacilli, has significantly affected the ability of physicians to treat infections, with resultant increased morbidity, mortality, and health care costs. In fact, some strains of bacteria are resistant to all available antibiotics, such as Acinetobacter baumannii, which is the focus of this report. Therefore, the development of new antibiotics active against these resistant strains is urgently needed. In this study, BfmR is further validated as an intriguing target for a novel class of antibiotics. Successful inactivation of BfmR would confer the multiple benefits of a decreased ability of A. baumannii to survive in human body fluids, increased sensitivity to complement-mediated bactericidal activity and, importantly, increased sensitivity to other antibiotics. Structural studies support the potential for this "druggable" target, as they identify the potential for small-molecule binding at functionally relevant sites. Next-phase high-throughput screening studies utilizing BfmR are warranted.

PubMed: 27303741
DOI: 10.1128/mSphere.00082-16

実験手法

X-RAY DIFFRACTION (2.1 Å)