Mapping of Functional Subdomains in the atALKBH9B m6A-Demethylase Required for Its Binding to the Viral RNA and to the Coat Protein of Alfalfa Mosaic Virus
| Autor: | Mireya Martínez-Pérez, Luis Alvarado-Marchena, Frederic Aparicio, Vicente Pallás, Joan Marquez-Molins |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
RNA-binding protein RNA-binding proteins Plant Science 01 natural sciences SB1-1110 03 medical and health sciences chemistry.chemical_compound Epitranscriptomics Alfamovirus BIOQUIMICA Y BIOLOGIA MOLECULAR Peptide sequence RNA covalent modifications 030304 developmental biology 0303 health sciences biology Chemistry N6-methyladenosine Plant viruses Plant culture RNA biology.organism_classification RNA demethylases Cell biology Alfalfa mosaic virus biology.protein Demethylase ALKBH N6-Methyladenosine Ncpsdummy6-methyladenosine 010606 plant biology & botany Binding domain |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname Frontiers in Plant Science, Vol 12 (2021) |
| DOI: | 10.3389/fpls.2021.701683 |
| Popis: | [EN] N-6-methyladenosine (m(6)A) modification is a dynamically regulated RNA modification that impacts many cellular processes and pathways. This epitranscriptomic methylation relies on the participation of RNA methyltransferases (referred to as "writers") and demethylases (referred to as "erasers"), respectively. We previously demonstrated that the Arabidopsis thaliana protein atALKBH9B showed m(6)A-demethylase activity and interacted with the coat protein (CP) of alfalfa mosaic virus (AMV), causing a profound impact on the viral infection cycle. To dissect the functional activity of atALKBH9B in AMV infection, we performed a protein-mapping analysis to identify the putative domains required for regulating this process. In this context, the mutational analysis of the protein revealed that the residues between 427 and 467 positions are critical for in vitro binding to the AMV RNA. The atALKBH9B amino acid sequence showed intrinsically disordered regions (IDRs) located at the N-terminal part delimiting the internal AlkB-like domain and at the C-terminal part. We identified an RNA binding domain containing an RGxxxRGG motif that overlaps with the C-terminal IDR. Moreover, bimolecular fluorescent experiments allowed us to determine that residues located between 387 and 427 are critical for the interaction with the AMV CP, which should be critical for modulating the viral infection process. Finally, we observed that atALKBH9B deletions of either N-terminal 20 residues or the C-terminal's last 40 amino acids impede their accumulation in siRNA bodies. The involvement of the regions responsible for RNA and viral CP binding and those required for its localization in stress granules in the viral cycle is discussed. This work was funded by grant PID2020-115571RB-I00 from the Spanish Agencia Estatal de Investigacion (AEI) and Fondo Europeo de Desarrollo Regional (FEDER). LA-M is the recipient of a Ph.D. fellowship from the Ministerio de Ciencia, Tecnologia y Telecomunicaciones (MICITT) from Costa Rica. |
| Databáze: | OpenAIRE |
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