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Mg-dependent mechanism of environmental versatility in a multidrug efflux pump.
Structure
January 2025
Department of Chemistry, Britannia House, 7 Trinity Street, King's College London, London, SE1 1DB, UK; School of Biological Sciences, University of Southampton, Southampton, SO17 1BJ, UK. Electronic address:
Tripartite resistance nodulation and cell division multidrug efflux pumps span the periplasm and are major drivers of multidrug resistance among gram-negative bacteria. Cations, such as Mg, become concentrated within the periplasm and, in contrast to the cytoplasm, its pH is sensitive to conditions outside the cell. Here, we reveal an interplay between Mg and pH in modulating the structural dynamics of the periplasmic adapter protein, AcrA, and its function within the prototypical AcrAB-TolC multidrug pump from Escherichia coli.
View Article and Find Full Text PDFPhoto-curing hyaluronic acid-Janus antibacterial packs as O generator precisely modulate the infectious microenvironment for antibiotic-free periodontal therapy.
Mater Today Bio
February 2025
School of Pharmaceutical Sciences, Sun Yat-Sen University, University Town, Guangzhou, 510006, China.
Periodontal disease stands the leading cause of tooth loss in adults. While scaling and root planning is considered the "gold standard" treatment, it is often insufficient in efficiently eliminating anaerobic bacteria from deep periodontal pockets. In this work, an antibiotic-free and photo-curing hyaluronic acid-Janus (H-Janus) antibacterial pack was developed to inhibit the growth and colonization of residual bacteria within the pockets for reducing the recurrence of periodontitis.
View Article and Find Full Text PDFThe mutational landscape of Staphylococcus aureus during colonisation.
Nat Commun
January 2025
Parasites & Microbes Programme, Wellcome Sanger Institute, Hinxton, UK.
Staphylococcus aureus is an important human pathogen and a commensal of the human nose and skin. Survival and persistence during colonisation are likely major drivers of S. aureus evolution.
View Article and Find Full Text PDFEffect of Fecal Microbiota Transplant on Antibiotic Resistance Genes Among Patients with Chronic Pouchitis.
Dig Dis Sci
January 2025
Division of Gastroenterology, University of California, San Francisco, CA, USA.
Background: Pouchitis is common among patients with ulcerative colitis (UC) who have had colectomy with ileal pouch-anal anastomosis. Antibiotics are first-line therapy for pouch inflammation, increasing the potential for gut colonization with multi-drug resistant organisms (MDRO). Fecal microbial transplant (FMT) is being studied in the treatment of pouchitis and in the eradication of MDRO.
View Article and Find Full Text PDFIntestinal interstitial fluid isolation provides novel insight into the human host-microbiome interface.
Cardiovasc Res
January 2025
Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany.
Aims: The gastrointestinal (GI) tract is composed of distinct sub-regions, which exhibit segment-specific differences in microbial colonization and (patho)physiological characteristics. Gut microbes can be collectively considered as an active endocrine organ. Microbes produce metabolites, which can be taken up by the host and can actively communicate with the immune cells in the gut lamina propria with consequences for cardiovascular health.
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