Microbial Consortia: Synergistic Effects on Plastic Degradation and Enzyme Production

Growing interest in biological degradation as a sustainable mitigation strategy is a result of the fact that plastic pollution is still one of the most persistent environmental threats. Through cooperative metabolism and complementary enzyme production, microbial consortia—diverse communities of bacteria, fungi, or both—have shown synergistic capacities to break down otherwise resistant plastics, outperforming single isolates. The enzymatic or oxidative activity of one organism in mixed cultures can release substrates for other organisms, speeding up the depolymerization and mineralization of polymers like polyethylene, polyethylene terephthalate, and polystyrene. More thorough degradation pathways are made possible by these consortia’s support of diverse enzymatic repertoires, such as laccases, cutinases, and multicopper oxidases. Although previous research has listed strains and enzymes that break down plastic, this review synthesizes in a novel way how particular metabolic interactions within consortia promote superior plastic biodegradation. We discuss the significance of enzyme complementarity and cross-feeding, highlight recent research that demonstrates co-occurrence and functional cooperation, and pinpoint important design guidelines for scalable, consortium-based bioremediation. Future waste management solutions are informed by these insights into both the ecology of natural plastispheres and engineered microbial systems.