Abstract: The present disclosure relates to recombinant polypeptides that have olivetolic acid cyclase activity, nucleic acids encoding these recombinant polypeptides, recombinant host cells that produce these recombinant polypeptides, and compositions comprising the recombinant polypeptides, nucleic acids, and/or recombinant host cells. The present disclosure also relates to uses of these recombinant polypeptides, nucleic acids encoding them, and recombinant host cells comprising them, in methods for the preparation of cannabinoids and cannabinoid precursors.