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. 2022 Mar 25;13:863892. doi: 10.3389/fpls.2022.863892

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Copyright © 2022 Coculo and Lionetti.

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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Subcellular localization and activities of PMEI-PMEs and PMEIs. HG is methylesterified in the golgi apparatus, where PMEIs can avoid a premature pectin de-methylesterification by PME, which could cause a pectin jellification. Pectin is secreted in the apoplast in a high methylesterified form. In this compartment, a fine-tuning of PME activity is exerted by independent and clustered PMEIs to regulate the degree and pattern of pectin methylesterification in various plant physiology processes. Subtilisin-like proteases (Subtilases) can degrade the processing motif of PMEI-PME catalyzing the separation of the inhibitor from the PME domain.