NOVELTY - Isolated polypeptide having triterpene synthase activity and comprising peptide domains I, II, III, IV, and V, is new, where the domain I comprises an amino acid sequence that is at least 95% identical to the amino acid sequence of SEQ ID NO: 17 (comprising a fully defined sequence of 14 amino acids as given in the specification), and the domain II comprises an amino acid sequence that is at least 95% identical to the amino acid sequence of SEQ ID NO: 18 (comprising a fully defined sequence of 18 amino acids as given in the specification).    USE - The isolated polypeptide is useful for producing triterpenes (claimed) including botryococcene that is useful for producing biofuel.    ADVANTAGE - The The isolated polypeptide: exhibits increased triterpene synthase catalytic activity and improved stability; and provides the triterpenes with improved yield.    DETAILED DESCRIPTION - Isolated polypeptide having triterpene synthase activity and comprising peptide domains I, II, III, IV, and V, is new, where the domain I comprises an amino acid sequence that is at least 95% identical to the amino acid sequence of SEQ ID NO: 17 (comprising a fully defined sequence of 14 amino acids as given in the specification), the domain II comprises an amino acid sequence that is at least 95% identical to the amino acid sequence of SEQ ID NO: 18 (comprising a fully defined sequence of 18 amino acids as given in the specification), the domain III comprises an amino acid sequence that is at least 95% identical to the amino acid sequence of SEQ ID NO: 19 (comprising a fully defined sequence of 18 amino acids as given in the specification), the domain IV comprises an amino acid sequence that is at least 95% identical to the amino acid sequence of SEQ ID NO: 20 (comprising a fully defined sequence of 16 amino acids as given in the specification), and the domain V comprises an amino acid sequence that is at least 95% identical to the amino acid sequence of SEQ ID NO: 21 (comprising a fully defined sequence of 14 amino acids as given in the specification). An INDEPENDENT CLAIM is also included for a kit for producing triterpenes, comprising the isolated polypeptide, and instructions for using the polypeptide for producing triterpenes.