Host nutrients drive paired-substrate growth and distinct biofilm lifestyles in Finegoldia magna
Host-associated bacteria navigate complex nutrient landscapes where metabolites act as both growth substrates and cues that shape behavior. Yet, for most commensal and pathogenic bacteria, the nutrients and metabolisms that support persistence in the host remain unknown. Finegoldia magna is an obligate anaerobe that normally colonizes human skin and mucosal surfaces but also causes persistent…
Finegoldia magna, an obligate anaerobe, typically colonizes human skin and mucosal surfaces but can also cause infections in medical devices and chronic wounds. A study sought to understand the nutrients that drive the growth and biofilm behaviors of this pathogen. Researchers developed a defined medium to investigate F. magna's physiology.
They discovered that F. magna's metabolism is specialized to use a limited set of host-relevant nutrients, such as glycine, fructose, nucleosides, and betaine. Growth typically required two carbon substrates with a compatible electron donor-acceptor pair, indicating redox balance imposes major constraints on its metabolism. Surprisingly, even in media derived from human chronic wound tissue, F. magna exhibited a similarly restricted metabolic profile, consuming primarily peptides, nucleosides, and betaine.
These nutrients also influenced biofilm behavior, with different metabolites promoting surface attachment or aggregation. This study demonstrates that F. magna's limited metabolic flexibility allows it to exploit host-derived products of skin physiology, tissue damage, and inflammation, making it especially responsive to nutrient availability and linking local metabolite composition to key persistence behaviors like biofilm formation.
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