IUBMB Enzyme Nomenclature


Accepted name: versiconal hemiacetal acetate esterase

Reaction: (1) versiconal hemiacetal acetate + H2O = versiconal + acetate
(2) versiconol acetate + H2O = versiconol + acetate

For diagram of reaction click here.

Glossary: versiconal = (2S,3S)-2,4,6,8-tetrahydroxy-3-(2-hydroxyethyl)anthra[2,3-b]furan-5,10-dione
versiconal hemiacetal acetate = 2-[(2S,3S)-2,4,6,8-tetrahydroxy-5,10-dioxo-5,10-dihydroanthra[2,3-b]furan-3-yl]ethyl acetate
versiconol = 1,3,6,8-tetrahydroxy-3-[(2S)-1,4-dihydroxybutan-2-yl]anthracene-5,10-dione
versiconol acetate = (3S)-4-hydroxy-3-[1,3,6,8-tetrahydroxy-9,10-dioxo-9,10-dihydroanthracen-2-yl]butyl acetate

Other name(s): VHA esterase

Systematic name: versiconal-hemiacetal-acetate O-acetylhydrolase

Comments: Isolated from the mold Aspergillus parasiticus. Involved in a metabolic grid that leads to aflatoxin biosynthesis.

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


1. Kusumoto, K. and Hsieh, D.P. Purification and characterization of the esterases involved in aflatoxin biosynthesis in Aspergillus parasiticus. Can. J. Microbiol. 42 (1996) 804-810. [PMID: 8776851]

2. Chang, P.K., Yabe, K. and Yu, J. The Aspergillus parasiticus estA-encoded esterase converts versiconal hemiacetal acetate to versiconal and versiconol acetate to versiconol in aflatoxin biosynthesis. Appl. Environ. Microbiol. 70 (2004) 3593-3599. [PMID: 15184162]

[EC created 2013]

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