The present disclosure provides a poly nucleotide comprising: (a) a nucleic acid sequence encoding an olivetol synthase (OLS): and (b) a heterologous regulatory element operably linked to the nucleic acid sequence. The present disclosure further relates to an engineered cell comprising an olivetol synthase (OLS). Also provided are a cell extract or cell culture medium or a composition comprising 3.5.7- trioxododecanoyl-CoA, olivetol, olivetolic acid, a cannabinoid, and/or an isomer, analog, or derivative thereof, and a method of making 3.5.7-trioxododecanoyl-CoA, olivetol, olivetolic acid, a cannabinoid, and/or an isomer, analog, or derivative thereof. Also provided is a cannabinoid produced by the engineered cell, isolated from the cell extract or cell culture medium, and/or made by the method described herein. The present disclosure also provides a non-natural olivetol synthase (OLS).