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Jiangella sp. BA12, a Candidate Novel Species from Plastic Debris Ingested by a Loggerhead Sea Turtle: Genus-Wide Comparison Reveals Conserved yet Uncharacterized Biosynthetic Gene Clusters
Summary
Scientists found a new type of bacteria living on a piece of plastic that a sea turtle had eaten, and its DNA suggests it can make several potentially new chemical compounds, the kind of molecules that have historically led to antibiotics and other medicines. While no useful drug activity was found yet, the discovery matters because it shows that plastic pollution in the ocean can carry unusual bacteria with untapped medical potential, giving researchers new places to search for future antibiotics as existing ones become less effective against resistant germs.
Rare actinobacteria are promising sources of specialized metabolites, yet genome mining still prioritizes genomes encoding many biosynthetic gene clusters (BGCs) rather than clusters that are distant from characterized chemistry. Here, we describe the isolation, for the first time, of a novel Jiangella strain reported from a marine, animal-associated plastisphere, and place its biosynthetic repertoire in the context of the whole genus. Digital DNA-DNA hybridization (57.8%) and OrthoANIu (94.65%) values against its closest relative, J. alba DSM 45237ᵀ, support its assignment as a candidate novel species. antiSMASH predicted twelve BGCs, within the range observed across the genus (7-13), of which only one matched a characterized pathway, and the Biosynthetic Novelty Index of the genome was 865.3, the fourth highest among the twelve genomes analyzed. Across these genomes, 124 BGCs grouped into 70 gene cluster families, 74% of them strain-specific. Two families without any characterized representative, a lasso-peptide family and a RiPP recognition element-containing family, were instead conserved across a subclade, down to nearly identical precursor peptides. No antimicrobial activity was detected under the conditions tested. Genus-wide comparison therefore identifies conserved yet uncharacterized families as rational priorities that cluster counts alone would miss.