EC 5.4.99.55     
Accepted name: δ-amyrin synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = δ-amyrin
Other name(s): SlTTS2 (gene name)
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, δ-amyrin-forming)
Comments: The enzyme from tomato (Solanum lycopersicum) gives 48% δ-amyrin, 18% α-amyrin, 13% β-amyrin and traces of three or four other triterpenoid alcohols [1]. See also EC 5.4.99.40, α-amyrin synthase and EC 5.4.99.39, β-amyrin synthase.
References:
1.  Wang, Z., Guhling, O., Yao, R., Li, F., Yeats, T.H., Rose, J.K. and Jetter, R. Two oxidosqualene cyclases responsible for biosynthesis of tomato fruit cuticular triterpenoids. Plant Physiol. 155 (2011) 540–552. [PMID: 21059824]
[EC 5.4.99.55 created 2011]