Involved in gibberellin biosynthesis (PubMed:16307364). Catalyzes the conversion of geranylgeranyl diphosphate to the gibberellin precursor ent-copalyl diphosphate (ent-CPP) (PubMed:16307364). Involved in the production of antifungal dolabralexin phytoalexins in response to biotic and abiotic stresses (PubMed:29475898). In response to fungal infection and in associtation with KSL4, is involved in the production dolabradiene, a type of antifungal phytoalexin (PubMed:29475898). (2E,6E,10E)-geranylgeranyl diphosphate = ent-copalyl diphosphate Plant hormone biosynthesis; gibberellin biosynthesis. Expressed in tassels. Induced by the fungal pathogens Fusarium graminearum and Fusarium verticillioides. The Asp-Xaa-Asp-Asp (DXDD) motif is important for the catalytic activity through binding to Mg(2+). Belongs to the terpene synthase family. Tpsc subfamily.