RiPPs in functional laboratory medicine: translational opportunities and class III lanthipeptides as a comparative case study

Ribosomally synthesized and post-translationally modified peptides (RiPPs) are genetically encoded natural products that undergo diverse enzymatic modifications to generate structurally constrained molecules with broad biological activities and substantial engineering potential. Their defined biosynthetic origins, target-recognition properties, structural stability, and genetic encodability make RiPPs attractive molecular resources for both natural product research and emerging function-oriented applications in laboratory medicine. In this review, we summarize the biosynthetic logic and structural diversity of RiPPs, with particular emphasis on class III lanthipeptides as a representative and underexplored subgroup of structural and biosynthetic innovation. We curate 19 structurally characterized and experimentally validated class III lanthipeptides and compare their taxonomic origins, biosynthetic gene cluster organization, precursor peptide features, LanKC-mediated modifications, ring topologies, maturation routes, and reported biological functions. The analysis reveals a strong representation of Actinobacteria, a predominance of Lab-containing architectures, considerable diversity in maturation strategies, and a substantial proportion of functionally unresolved members. Beyond this comparative analysis, we discuss the emerging potential of RiPPs in mechanism-informed antimicrobial susceptibility testing, functional molecular diagnostics, microbiome functional-state assessment, engineered molecular probes, and precision anti-infective strategies. Because most of these applications remain exploratory or preclinical, we further propose a six-level evidence framework that distinguishes BGC presence, transcriptional activity, mature product detection, target engagement, biological activity, and clinical validation. By integrating the diversity of class III lanthipeptides with the broader translational potential of RiPPs, this review provides a framework for linking biosynthetic information, structural innovation, molecular function, and future applications in functional laboratory medicine.