Pantothenic acid is a precursor of coenzyme A (CoA), an essential cofactor for the TCA cycle and fatty acid beta-oxidation. Vitamin B5 is thus essential for gaining energy from food as well as generating energy for immune cells. Vitamin B5 is found in foods such as liver, eggs, chicken, and fermented soybeans. Vitamin B5 derived from gut bacteria exists as free pantothenic acid, which is directly absorbed in the large intestine, converted to CoA, and distributed in the same way as dietary vitamin B5.
Bacteroides fragilis, Prevotella copri, Ruminococcus lactaris, Ruminococcus torques, Salmonella enterica, and Helicobacter pylori produce vitamin B5 endogenously. In contrast, most Fusobacterium, Bifidobacterium spp., Faecalibacterium spp., Lactobacillus spp., and some strains of Clostridium difficile are not able to produce B5, yet they need it for their growth, suggesting that these bacteria compete with the host for vitamin B5 utilization.
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