Figure 2.

Alignment of deduced amino acid sequences of gymnosperm monoterpene, sesquiterpene, and diterpene synthases. Sequences are as follows: 1, (E)-α-bisabolene synthase; 2, abietadiene synthase (19); 3, taxadiene synthase (35); 4, myrcene synthase (13); 5, (−)-pinene synthase (13); 6, (−)-limonene synthase (13); 7, δ-selinene synthase (5); 8, γ-humulene synthase (5). Residues boxed in black are identical for at least five of the eight compared sequences. A horizontal bar marks the tandem arginine motif. Dots mark the aspartate residues of the DDXXD element. The alignment was created with the pileup program (Genetics Computer Group).