Project description:We report a complete genome sequence of Collinsella aerofaciens JCM 10188T (=VPI 1003T). The genome consists of a circular chromosome (2,428,218 bp with 60.6% G+C content) and two extrachromosomal elements. The genome was predicted to contain 5 sets of rRNA genes, 58 tRNA genes, and 2,079 protein-encoding sequences.
Project description:Some members of the human gut microbiota profoundly influence their host's physiology, health, and therapeutic responses, but the responsible molecules and mechanisms are largely unknown. As part of a project to identify immunomodulators produced by gut microbes, we analyzed the metabolome of Collinsella aerofaciens, an actinomycete that figures prominently in numerous association studies. The associations are typically positive correlations of C. aerofaciens with pro-inflammatory responses and undesirable outcomes, but an association with favorable responses to PD-1/PD-L1 cancer immunotherapy is a notable exception. A phenotypic assay-guided screen using dendritic cells (mBMDCs) and cytokine readouts identified the active compound, which was structurally characterized as a lysoglycoglycerolipid with an acetal-bearing β-galactofuranose head group (CaLGL-1, 1). The structural assignment was confirmed through total synthesis. Assays with tlr2-/-, tlr4-/-, and wt mBMDCs revealed TLR2-dependent signaling. CaLGL-1 is produced by a conversion of a bacterially biosynthesized plasmalogen (CaPlsM, 3) to CaLGL-1 (1) in a low-pH environment.
Project description:Collinsella aerofaciens, a rod-shaped nonmotile obligate anaerobe, is the most abundant actinobacterium in the gastrointestinal tract of healthy humans. An altered abundance of C. aerofaciens may be linked with several health disorders, including irritable bowel syndrome. In the present study, we report the complete genome sequence of C. aerofaciens strain indica.