Encyclopedia of Lipidomics

Living Edition
| Editors: Markus R. Wenk

Tocochromanols in Plants: Functional Diversity of

  • Franz Hadacek
Living reference work entry
DOI: https://doi.org/10.1007/978-94-007-7864-1_135-1

Definitions

Tocochromanols

Tocochromanols comprise lipid molecules that contain an aromatic head group originating from the amino acid tyrosine and a saturated or unsaturated C20 isoprenoid sidechain, all of which also are known collectively as vitamin E.

Structure and Occurrence

Tocopherols and tocotrienols, a class of prenyl lipids, collectively also addressed as tocochromanols, represent plant metabolites that have been recognized as essential vitamins for human nutrition but also can be found as characteristic metabolites in all photosynthetic organisms. All tocopherol and tocotrienol derivatives are also collectively known as vitamin E. They are synthetized in the photosynthetic membrane system of cyanobacteria and the inner envelope membrane in the plastids of eukaryotes (Meyer and Kinney 2009). They consist of a diterpene C 20side chain, which is saturated in case of tocopherols and unsaturated with three double bonds in case of tocotrienols. The side chain is linked to a...

Keywords

Cyclic Ether Geranylgeranyl Diphosphate Homogentisic Acid Tocopherol Cyclase Chromanol Ring 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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References

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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  1. 1.Department of Plant Biochemistry, Albrecht-von-Haller-Institute for Plant SciencesGeorg-August-University GoettingenGoettingenGermany