期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 114, 期 40, 页码 10755-10760出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1703139114
关键词
m6A; demethylase; ALKBH9B; plant virus; coat protein
资金
- Spanish granting agency Direccion General de Investigacion Cientifica y Tecnica [BIO2014-54862-R]
- Prometeo Program from Generalitat Valenciana [GV2015/010]
- Ramon y Cajal Program of the Ministerio de Educacion y Ciencia [RYC-2010-06169]
- Subprograma FPI-MINECO (Formacion de Personal Investigador-Ministerio de Economia y Competitividad) [FPI-2015-072406]
N-6-methyladenosine (m(6)A) is an internal, reversible nucleotide modification that constitutes an important regulatory mechanism in RNA biology. Unlike mammals and yeast, no component of the m6A cellular machinery has been described in plants at present. m6A has been identified in the genomic RNAs of diverse mammalian viruses and, additionally, viral infection was found to be modulated by the abundance of m(6)A in viral RNAs. Here we show that the Arabidopsis thaliana protein atALKBH9B (At2g17970) is a demethylase that removes m(6)A from single-stranded RNA molecules in vitro. atALKBH9B accumulates in cytoplasmic granules, which colocalize with siRNA bodies and associate with P bodies, suggesting that atALKBH9B m(6)A demethylase activity could be linked to mRNA silencing and/or mRNA decay processes. Moreover, we identified the presence of m(6)A in the genomes of two members of the Bromoviridae family, alfalfa mosaic virus (AMV) and cucumber mosaic virus (CMV). The demethylation activity of atALKBH9B affected the infectivity of AMV but not of CMV, correlating with the ability of atALKBH9B to interact (or not) with their coat proteins. Suppression of atALKBH9B increased the relative abundance of m(6)A in the AMV genome, impairing the systemic invasion of the plant, while not having any effect on CMV infection. Our findings suggest that, as recently found in animal viruses, m(6)A modification may represent a plant regulatory strategy to control cytoplasmic-replicating RNA viruses.
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