Warianty tytułu
Języki publikacji
Abstrakty
Tocopherols are lipophilic antioxidants and together with tocotrienols belong to the vitamin-E family. The four forms of tocopherols (α-, β-, γ- and d-tocopherols) consist of a polar chromanol ring and lipophilic prenyl chain with differences in the position and number of methyl groups. The biosynthesis of tocopherols takes place mainly in plastids of higher plants from precursors derived from two metabolic pathways: homogentisic acid, an intermediate of degradation of aromatic amino acids, and phytyldiphosphate, which arises from methylerythritol phosphate pathway. The regulation of tocopherol biosynthesis in photosynthetic organisms occurs, at least partially, at the level of key enzymes as such including p-hydroxyphenylpyruvate dioxygenase (HPPD, EC 1.13.11.27), homogentisate phytyltransferase (HPT, EC 2.5.1.-), tocopherol cyclase (TC, EC 5.4.99.-), and two methyltransferases. Tocopherol biosynthesis changes during plant development and in response toward different stresses induced by highintensity light, drought, high salinity, heavy metals, and chilling. It is supposed that scavenging of lipid peroxy radicals and quenching of singlet oxygen are the main functions of tocopherols in photosynthetic organisms. The antioxidant action of tocopherols is related to the formation of tocopherol quinone and its following recycling or degradation. However, until now, the mechanisms of tocopherol degradation in plants have not been established in detail. This review focuses on mechanisms of tocopherols biosynthesis and its regulation in photosynthetic organisms. In addition, available information on tocopherol degradation is summarized.
Słowa kluczowe
Wydawca
Czasopismo
Rocznik
Tom
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Opis fizyczny
p.1607-1628,fig.,ref.
Twórcy
autor
- Department of Biochemistry and Biotechnology, Precapathian National University Named After Vassyl Stefanyk, 57 Shevchenko Str., 76025 Ivanovo-Frankivsk, Ukraine
autor
- Department of Biochemistry and Biotechnology, Precapathian National University Named After Vassyl Stefanyk, 57 Shevchenko Str., 76025 Ivanovo-Frankivsk, Ukraine
Bibliografia
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