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Uncharacterized subfamily of plant invertase/pectin methylesterase inhibitor domains This subfamily contains inhibitors similar to those of pectin methylesterase (PME; Pectinesterase; EC 3.1.1.11; CAZy class 8 of carbohydrate esterases) that catalyzes the demethylesterification of homogalacturonans in the cell wall. The proteinaceous PME inhibitor (PMEI) inhibits PME and invertase through formation of a non-covalent 1:1 complex. Depending on the mode of demethylesterification, PMEI activity results in either loosening or rigidification of the cell wall. PMEI has been implicated in the regulation of fruit development, carbohydrate metabolism and cell wall extension. It may also be involved in inhibiting microbial pathogen PMEs. Thus, PMEI probably plays an important physiological role in PME regulation in plants, possessing several potential applications in a food-technological context. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",