ArticleMicrobiome2026
Conserved protein sequence-structure signatures identify antibiotic resistance genes from the human microbiome.
Article in Microbiome, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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5 authors.
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Abstract
backgroundBacteria exhibiting antimicrobial resistance (AMR) are a significant public health challenge worldwide. The human microbiome is a known repository of key determinants of AMR, antibiotic resistance genes (ARGs). Identifying previously undetected ARGs in the human microbiome that confer resistance to clinical concentrations of antibiotics is a crucial component of addressing AMR, yet can be hindered by their low homology to existing ARGs. Here, we address this by focussing on functionally important protein regions.
resultsARG-PASS (ARG-PAirwise Sequence vs Structure) is a protein function prediction method which leverages a one-class support vector machine trained on pairwise primary and tertiary distributions of structurally conserved regions of proteins encoded by ARGs. ARG-PASS was applied to six reference strains of the Human Microbiome Project. Nine candidates were selected for experimental verification, and all were functionally confirmed when expressed in E.coli, belonging to ARG classes: APH, dfr, class B and C β-lactamases, and penicillin-binding proteins. We also used ARG-PASS directly on protein structures within the AlphaFold database and identified a phnP gene (metallo-β-lactamase fold) with low similarity to characterised β-lactamases and media-dependent ampicillin activity. In total, 80% of the tested genes confer resistance at CLSI resistant breakpoints and the remainder represent 'pre-resistance' genes, with activity but not at a clinically relevant minimum inhibitory concentration. We suggest pre-resistance genes may preferentially evolve into clinically relevant resistance determinants.
conclusionARG-PASS provides a precise computational approach that integrates sequence and structure to identify divergent ARGs that evade homology-based detection, supporting improved resistance surveillance and antibiotic stewardship. Video Abstract.
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