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. 2017 Nov 14;8:1959. doi: 10.3389/fpls.2017.01959

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Copyright © 2017 Pellaud and Mène-Saffrané.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Plant tocochromanol biosynthetic pathways and chemical structures of prenylquinols and tocochromanols. Whereas all four methylated forms, i.e., α-, β-, γ- and δ-tocochromanol, have been identified in wild-type plants for tocopherols, tocotrienols, and tocomonoenols, only the γ- form of solanesyl-derived tocochromanol PC-8 has been identified in wild-type plants. Its methylated form, methyl PC-8, has been found only in transgenic plants overexpressing VTE4. GGPP, geranylgeranyl pyrophosphate; HGA, homogentisate; HGGT, HGA geranylgeranyl transferase; HST, HGA solanesyl transferase; PC-8, plastochromanol-8; PPP, phytyl pyrophosphate; SAH, S-adenosylhomocystein; SAM, S-adenosylmethionine; SPP, solanesyl pyrophosphate; THGGPP, tetrahydrogeranylgeranyl pyrophosphate; VTE, vitamin E biosynthetic enzyme.