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Biofilm formation and maturation have been demonstrated to be regulated by distinct forms of cell-cell communication factors such as chemical and physical signals. However, whether the Geobacter sp. biofilms, which are typical electroactive biofilms, are affected by chemical signals is poorly understood. This research investigated the effects and corresponding mechanisms of endogenous and exogenous chemical signals (i.e., N-acylhomoserine lactones, AHLs) on the Geobacter soli biofilm. The results showed that Geobacter soli GSS01 secreted detectable endogenous AHLs to facilitate the formation and electrochemical activity of the biofilm, and that exogenous AHLs could further promoted these activities. Analyses of surface proteins revealed that the mechanisms promoted by endogenous and exogenous AHLs were somewhat different. Endogenous AHLs improved the relative abundance of external …