Functional and Evolutionary Analysis of the CASPARIAN STRIP MEMBRANE DOMAIN PROTEIN Family

Roppolo, Daniele; Boeckmann, Brigitte; Pfister, Alexandre; Boutet, Emmanuel; Rubio, Maria C.; Denervaud-Tendon, Valerie; Vermeer, Joop E. M.; Gheyselinck, Jacqueline; Xenarios, Ioannis; Geldner, Niko (2014). Functional and Evolutionary Analysis of the CASPARIAN STRIP MEMBRANE DOMAIN PROTEIN Family. Plant Physiology, 165(4), pp. 1709-1722. American Society of Plant Physiologists 10.1104/pp.114.239137

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CASPARIAN STRIP MEMBRANE DOMAIN PROTEINS (CASPs) are four-membrane-span proteins that mediate the deposition of Casparian strips in the endodermis by recruiting the lignin polymerization machinery. CASPs show high stability in their membrane domain, which presents all the hallmarks of a membrane scaffold. Here, we characterized the large family of CASP-like (CASPL) proteins. CASPLs were found in all major divisions of land plants as well as in green algae; homologs outside of the plant kingdom were identified as members of the MARVEL protein family. When ectopically expressed in the endodermis, most CASPLs were able to integrate the CASP membrane domain, which suggests that CASPLs share with CASPs the propensity to form transmembrane scaffolds. Extracellular loops are not necessary for generating the scaffold, since CASP1 was still able to localize correctly when either one of the extracellular loops was deleted. The CASP first extracellular loop was found conserved in euphyllophytes but absent in plants lacking Casparian strips, an observation that may contribute to the study of Casparian strip and root evolution. In Arabidopsis (Arabidopsis thaliana), CASPL showed specific expression in a variety of cell types, such as trichomes, abscission zone cells, peripheral root cap cells, and xylem pole pericycle cells.

Item Type:	Journal Article (Original Article)
Division/Institute:	08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant Development 08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)
UniBE Contributor:	Roppolo, Daniele, Gheyselinck, Jacqueline
Subjects:	500 Science > 580 Plants (Botany)
ISSN:	0032-0889
Publisher:	American Society of Plant Physiologists
Language:	English
Submitter:	Peter Alfred von Ballmoos-Haas
Date Deposited:	16 Oct 2014 13:21
Last Modified:	05 Dec 2022 14:37
Publisher DOI:	10.1104/pp.114.239137
URI:	https://boris.unibe.ch/id/eprint/59314