Ruminococcus bromii (R. bromii)

Ruminococcus bromii is a Gram-positive, anaerobic bacterium that serves as a keystone species in the human gut microbiome, specifically within the colon [Ze et al., 2012]. It is uniquely specialized for the degradation of resistant starch (RS), a type of dietary fiber that escapes digestion in the small intestine [Vibrant Wellness]. R. bromii utilizes a sophisticated extracellular multi-protein complex known as the amylosome to adhere to and hydrolyze crystalline starch granules into simpler sugars [ResearchGate]. These metabolic byproducts, such as acetate and glucose, are subsequently utilized by other beneficial gut microbes through a process called cross-feeding, which ultimately promotes the production of butyrate, a critical short-chain fatty acid for colonic health [Healthmatters.io]. Low levels of R. bromii have been associated with various conditions, including obesity, inflammatory bowel disease, and type 2 diabetes, while its abundance can be modulated by dietary interventions like resistant starch or pharmacological agents like berberine [NIH]. Although it is a whole organism rather than a single molecular target, its pivotal role in fiber metabolism makes it a significant focus for therapeutic strategies aimed at restoring gut homeostasis [InnerBuddies].

Other names

R. bromiiCluster IV RuminococciStarch-degrading bacterium

Degradation of resistant starch via the amylosome complex and cross-feeding of metabolites to butyrate-producing bacteria.