Salt tolerance of Arabidopsis thaliana requires maturation of N-glycosylated proteins in the Golgi apparatus.

Proceedings of the National Academy of Sciences of the United States of America
Jae Sook KangHisashi Koiwa

Abstract

Protein N-glycosylation in the endoplasmic reticulum (ER) and in the Golgi apparatus is an essential process in eukaryotic cells. Although the N-glycosylation pathway in the ER has been shown to regulate protein quality control, salt tolerance, and cellulose biosynthesis in plants, no biological roles have been linked functionally to N-glycan modifications that occur in the Golgi apparatus. Herein, we provide evidence that mutants defective in N-glycan maturation, such as complex glycan 1 (cgl1), are more salt-sensitive than wild type. Salt stress caused growth inhibition, aberrant root-tip morphology, and callose accumulation in cgl1, which were also observed in an ER oligosaccharyltransferase mutant, staurosporin and temperature sensitive 3a (stt3a). Unlike stt3a, cgl1 did not cause constitutive activation of the unfolded protein response. Instead, aberrant modification of the plasma membrane glycoprotein KORRIGAN 1/RADIALLY SWOLLEN 2 (KOR1/RSW2) that is necessary for cellulose biosynthesis occurred in cgl1 and stt3a. Genetic analyses identified specific interactions among rsw2, stt3a, and cgl1 mutations, indicating that the function of KOR1/RSW2 protein depends on complex N-glycans. Furthermore, cellulose deficient rsw1-1 an...Continue Reading

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Citations

Aug 30, 2008·Glycoconjugate Journal·Katharina PaschingerIain B H Wilson
Aug 27, 2009·Proceedings of the National Academy of Sciences of the United States of America·Harald NothaftChristine M Szymanski
Jan 11, 2012·Proceedings of the National Academy of Sciences of the United States of America·Charles T AndersonChris R Somerville
Nov 22, 2012·Proceedings of the National Academy of Sciences of the United States of America·Sandy VanderauweraFrank Van Breusegem
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