IUBMB Enzyme Nomenclature


Accepted name: δ-amyrin synthase

Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = δ-amyrin

For diagram of reaction click here.

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, α-amyrin synthase and EC, β-amyrin synthase.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


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 created 2011]

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