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Complete Genome Analysis Reveals Carbohydrate/Amino Acid Metabolism and Arginine Regulation in Pantoea sp Sm3640., a Potential Opportunistic Oral Pathogen

The oral cavity is rich in microorganisms, most of which remain unknown. In this study, based on carbohydrate-active enzymes (CAZymes), we characterized the complete genome sequence of Pantoea sp. strain SM3640, a potential oral opportunistic pathogen. We identified 97 CAZyme encoding genes belonging to 36 glycoside hydrolases, 45 glycosyltransferases, 9 carbohydrate esterases, 4 auxiliary activities, and 3 carbohydrate-binding modules. The complete genome analysis suggested that the gene profile of CAZymes was associated with the biosynthesis of carbohydrates and amino acids. In addition, we predicted that strain SM3640 can degrade carbohydrates and produce amino acids as an energy source and identified the arginine biosynthetic gene argR, which can regulate arginine synthesis in Trans. These results suggest that strain SM3640 can regulate arginine metabolism and play an important role in biofilm formation by bacteria and their interaction with caries- and periodontitis-associated pathogens.