IUBMB Enzyme Nomenclature


Accepted name: 2-keto-myo-inositol isomerase

Reaction: 2,4,6/3,5-pentahydroxycyclohexanone = 2D-2,3,5/4,6-pentahydroxycyclohexanone

For diagram of reaction click here.

Glossary: 2,4,6/3,5-pentahydroxycyclohexanone = (2R,3S,4s,5R,6S)-2,3,4,5,6-pentahydroxycyclohexanone = scyllo-inosose

Other name(s): IolI; inosose isomerase; 2KMI isomerase.

Systematic name: 2,4,6/3,5-pentahydroxycyclohexanone 2-isomerase

Comments: Requires a divalent metal ion for activity. Mn2+, Fe2+ and Co2+ can be used. The enzyme, found in the bacterium Bacillus subtilis, is part of the myo-inositol/D-chiro-inositol degradation pathway leading to acetyl-CoA.

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


1. Zhang, R.G., Dementieva, I., Duke, N., Collart, F., Quaite-Randall, E., Alkire, R., Dieckman, L., Maltsev, N., Korolev, O. and Joachimiak, A. Crystal structure of Bacillus subtilis ioli shows endonuclase IV fold with altered Zn binding. Proteins 48 (2002) 423-426. [PMID: 12112707]

2. Yoshida, K., Yamaguchi, M., Morinaga, T., Ikeuchi, M., Kinehara, M. and Ashida, H. Genetic modification of Bacillus subtilis for production of D-chiro-inositol, an investigational drug candidate for treatment of type 2 diabetes and polycystic ovary syndrome. Appl. Environ. Microbiol. 72 (2006) 1310-1315. [PMID: 16461681]

[EC created 2014]

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