ORIGINAL ABSTRACT

Glyphosate is a widely used non-selective herbicide associated with ecological and human health concerns due to its environmental persistence, highlighting the need for effective remediation strategies. Among available approaches, microbial enzyme-mediated degradation represents a promising biological solution. This study aimed to enrich and characterize glyphosate-degrading microbial consortia from coffee plantation soils, validate glyphosate and aminomethylphosphonic acid (AMPA) degradation by chromatographic analyses, and integrate genome-based functional annotation with comparative structural analyses to investigate enzymatic systems involved in C-P and C-N bond cleavage. The enrichment process, followed by metataxonomic and metagenomic analyses, revealed dynamic shifts in microbial community composition. Achromobacter and Serratia were identified as key genera, harboring genetic potential for glyphosate and AMPA degradation. High-performance liquid chromatography with diode array detection confirmed efficient transformation of both compounds, with consortia Con_CC and Con_CC-G achieving the highest removal efficiencies under carbon- and phosphorus-limited conditions. Genome-based functional annotation showed that both genera encode gene clusters associated with the C-P lyase pathway, while only Achromobacter harbors the gene encoding glyphosate oxidoreductase (GOX), linked to oxidative C-N bond cleavage. Structural modeling indicated conservation of key catalytic residues in PhnJ, whereas GOX-related sequences in Serratia corresponded to partial homologs lacking a complete catalytic site. By integrating chromatographic, genomic, and structural analyses, this study provides a multi-level framework linking microbial community dynamics, functional potential, and molecular mechanisms underlying glyphosate degradation.