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Human salivary α-amylase (HSAmy) has three distinct functions relevant to oral health: (1) hydrolysis of starch, (2) binding to hydroxyapatite (HA), and (3) binding to bacteria (e.g., viridans streptococci). Although the active site of HSAmy for starch hydrolysis is well-characterized, the regions responsible for bacterial binding are yet to be defined. Since HSAmy possesses several secondary saccharide-binding...