Applied Microbiology and Biotechnology

, Volume 102, Issue 11, pp 4641–4651 | Cite as

Biosynthesis and production of quercitols and their application in the production of pharmaceuticals: current status and prospects

  • Nobuya Itoh


(−)-vibo-Quercitol is a deoxyinositol (1l-1,2,4/3,5-cyclohexanepentol) that occurs naturally in low concentrations in oak species, honeydew honey, and Gymnema sylvestre. The author’s research group recently reported that (−)-vibo-quercitol and scyllo-quercitol (2-deoxy-myo-inositol, 1,3,5/2,4-cyclohexanepentol), a stereoisomer of (−)-vibo-quercitol, are stereoselectively synthesized from 2-deoxy-scyllo-inosose by the reductive reaction of a novel (−)-vibo-quercitol 1-dehydrogenase in Burkholderia terrae and of a known scyllo-inositol dehydrogenase in Bacillus subtilis, respectively. The author’s research group therefore identified two enzymes capable of producing both stereoisomers of deoxyinositols, which are rare in nature. (−)-vibo-Quercitol and scyllo-quercitol are potential intermediates for pharmaceuticals. In this review, the author describes the biosynthesis and enzymatic production of quercitols and myo-inositol stereoisomers and their application in the production of potential pharmaceuticals.


(−)-vibo-Quercitol scyllo-Quercitol scyllo-Inositol (−)-vibo-Quercitol 1-dehydrogenase (2-deoxy-scyllo-inosose reductase) scyllo-Inositol dehydrogenase (IolX) Enzymatic synthesis of quercitols Pharmaceutical 


Compliance with ethical standards

Conflict of interest

The author declares that he has no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by the author.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Biotechnology Research Center and Department of BiotechnologyToyama Prefectural UniversityImizuJapan

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