A mutation in At-nMat1a, which encodes a nuclear gene having high similarity to group II intron maturase, causes impaired splicing of mitochondrial NAD4 transcript and altered carbon metabolism in Arabidopsis thaliana

Plant & Cell Physiology
Naoki Nakagawa, Naoki Sakurai

Abstract

To elucidate the mechanism of cellulose synthesis, we isolated a mutant of Arabidopsis (changed sensitivity to cellulose synthesis inhibitors 1, css1) that showed changed sensitivity to cellulose biosynthesis inhibitor. The analysis of phenotypes indicated that the css1 mutation influenced various fundamental metabolic pathways including amino acid metabolism, triacylglycerol degradation and polysaccharide synthesis (cellulose and starch) during the early stage of plant growth. Unexpectedly, the map-based cloning of the gene responsible for the css1 mutation identified a protein (At-nMat1a) that was assumed to be a splicing factor of the mitochondrial group II intron. In accordance with this result, this mutant exhibited improper splicing of the mitochondrial NAD4 transcript. We noticed that the phenotypes of the css1 mutant are similar to the responses to anoxia that hinders mitochondrial aerobic respiration. It seems that the defect in the function of mitochondria influences various aspects of fundamental cellular metabolism including cellulose synthesis. Our results suggested that sucrose synthase (SuSy), an enzyme involved in the biosynthesis of cellulose, plays key roles in the connection between mitochondria and cellulose...Continue Reading

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Citations

Jun 20, 2008·Molecular Genetics and Genomics : MGG·Claire RemaclePatrice P Hamel
Jul 24, 2012·Journal of Experimental Botany·Maki MurayamaTakashi Hirayama
Jul 16, 2008·Plant & Cell Physiology·Sota Fujii, Kinya Toriyama
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Jun 1, 2011·The Plant Journal : for Cell and Molecular Biology·Kristina KühnJames Whelan
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