Part A What is the function of the lacY gene in the lac operon? The lacY gene codes for permease, a membrane-bound protein that transports lactose into the bacterial cell. The lacY gene codes for
\beta
-galactosidase, a protein that cleaves the lactose sugar into its components, glucose and galactose. The lacY gene codes for transacetylase. Its physiological role is still not completely clear but it may be involved in the removal of toxic by-products of lactose digestion from the cell. The lacY gene codes for adenyl cyclase, a protein that catalyzes the conversion of ATP to cAMP.