Methods are provided for the modulation of hSGLT3 protein glucosensor activity. The sensor is expressed in cholinergic neurons that regulate muscle activity, and in tissues including the brain and pacreas. The present invention also provides methods of identifying therapeutic compounds that modify the function of these sensors. Such therapeutic compounds have a functional effect on regulators of muscle activity, including gastrointestinal smooth muscles; on regulation of weight and metabolism; regulation of pancreatic function, including glucagons release; and in taste perception.