In this issue of Science Signaling, Mills et al. show that the amino acid ʟ-arginine increases the concentration of the second messenger c-di-GMP in Salmonella enterica serovar Typhimurium through a specific diguanylate cyclase, leading to increased production of the exopolysaccharide cellulose, which is an extracellular matrix component of environmental and host-associated biofilms.
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