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Studying the remodeling of a cell wall domain during seed development

Studying the remodeling of a cell wall domain during seed development
During the development of the seed in Arabidopsis, local loosening of a cell wall domain is required for proper function later during the imbibition of the dry seed. In this article in Developmental Cell, researchers at the LRSV (UMR CNRS / UPS) expose the molecular actors that govern the local remodeling of this wall domain.

The plant cell wall consists of complex polysaccharide-protein matrices. This study uses the cell wall dynamics of the seed surface of Arabidopsis thaliana to elucidate new molecular mechanisms involved in the positioning of remodeling enzymes in cell wall domains.

Reshaping the areas of the cell wall

Researchers show that the activity of a pectin methyl esterase inhibitor (PMEI6) leads to the creation of a particular pectin motif that serves as an anchoring platform for a peroxidase (PRX36). This domain will thus concentrate the loosening activity of PRX36 to this cell wall domain during subsequent development. Eventually, the pre-fragilized cell wall domain will be broken upon mature seed imbibition, releasing a polysaccharide hydrogel that will improve germination.

These results highlight the role of polysaccharide-cell wall protein interactions in the remodeling of a cell wall domain, results that may be also extended to other plant cell walldomains And to other plant species.

See also

Learn more:

Francoz E, Ranocha P, Le Ru A, Martinez Y, Fourquaux I, Jauneau A, Dunand C, Burlat V. Pectin Demethylesterification Generates Platforms that Anchor Peroxidases to Remodel Plant Cell Wall Domains.Dev Cell. 2019 Jan 28;48(2):261-276.e8. doi: 10.1016/j.devcel.2018.11.016. Epub 2018 Dec 13.