Described in this application are enzymes (e.g., cucurbitadienol synthases (CDS), UDP-glycosyltransferases (UGT), C11 hydroxylases, epoxide hydrolases (EPH), squalene epoxidases, and/or cytochrome P450 reductases), host cells expressing the enzymes, and methods of producing mogrol precursors, mogrol, and/or mogrosides using such host cells.