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. 2018 Nov 9;9:1623. doi: 10.3389/fpls.2018.01623

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Copyright © 2018 Dorokhov, Sheshukova and Komarova.

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) and the copyright owner(s) 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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Sources of endogenous methanol in plant cell. The main impact to overall cellular methanol production is made by pectin methylesterases (PMEs) in the reaction of cell wall pectin demethylesterification. PMEs digest ester bonds in the methylated homogalacturonan (HG) component of pectin releasing methanol. The other source of methanol in plant cell is the demethylation of such macromolecules as DNA, RNA and proteins. Methanol carbon could be included in cellular metabolic pathways: formaldehyde and formic acid formed from methanol make a contribution via the folate-driven one-carbon (1C) cycle in the biosynthesis of serine, methionine, as well as purines and thymidylate in nucleic acids. C, cytoplasm; N, nucleus; CW, cell wall; HG, homogalacturonan; MeOH, methanol; Me, methyl group; PMEs, pectin methylesterases; THF, tetrahydrofolate. Histones are designated with yellow cylinders.