Pfaff, Christina and Ehrnsberger, Hans F. and Flores-Tornero, Maria and Sorensen, Brian B. and Schubert, Thomas and Laengst, Gernot and Griesenbeck, Joachim and Sprunck, Stefanie and Grasser, Marion and Grasser, Klaus D. (2018) ALY RNA-Binding Proteins Are Required for Nucleocytosolic mRNA Transport and Modulate Plant Growth and Development. PLANT PHYSIOLOGY, 177 (1). pp. 226-240. ISSN 0032-0889, 1532-2548
Full text not available from this repository. (Request a copy)Abstract
The regulated transport of mRNAs from the cell nucleus to the cytosol is a critical step linking transcript synthesis and processing with translation. However, in plants, only a few of the factors that act in the mRNA export pathway have been functionally characterized. Flowering plant genomes encode several members of the ALY protein family, which function as mRNA export factors in other organisms. Arabidopsis (Arabidopsis thaliana) ALY1 to ALY4 are commonly detected in root and leaf cells, but they are differentially expressed in reproductive tissue. Moreover, the subnuclear distribution of ALY1/2 differs from that of ALY3/4. ALY1 binds with higher affinity to single-stranded RNA than double-stranded RNA and single-stranded DNA and interacts preferentially with 5-methylcytosine-modified single-stranded RNA. Compared with the full-length protein, the individual RNA recognition motif of ALY1 binds RNA only weakly. ALY proteins interact with the RNA helicase UAP56, indicating a link to the mRNA export machinery. Consistently, ALY1 complements the lethal phenotype of yeast cells lacking the ALY1 ortholog Yra1. Whereas individual aly mutants have a wild-type appearance, disruption of ALY1 to ALY4 in 4xaly plants causes vegetative and reproductive defects, including strongly reduced growth, altered flower morphology, as well as abnormal ovules and female gametophytes, causing reduced seed production. Moreover, polyadenylated mRNAs accumulate in the nuclei of 4xaly cells. Our results highlight the requirement of efficient mRNA nucleocytosolic transport for proper plant growth and development and indicate that ALY1 to ALY4 act partly redundantly in this process; however, differences in expression and subnuclear localization suggest distinct functions.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HNRNP-LIKE PROTEINS; GENE-EXPRESSION; TREX COMPLEX; EXPORT ADAPTERS; NUCLEAR EXPORT; ARABIDOPSIS; INTERACTS; UAP56; 5-METHYLCYTOSINE; PARTICIPATE; |
| Subjects: | 500 Science > 580 Botanical sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Pflanzenwissenschaften > Lehrstuhl für Zellbiologie und Pflanzenphysiologie Biology, Preclinical Medicine > Institut für Biochemie, Genetik und Mikrobiologie > Lehrstuhl für Biochemie III |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 17 Mar 2020 14:12 |
| Last Modified: | 17 Mar 2020 14:12 |
| URI: | https://pred.uni-regensburg.de/id/eprint/14615 |
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