Presence of poly(A) and poly(A)-rich tails in a positive-strand RNA virus known to lack 3 ' poly(A) tails
文献类型: 外文期刊
作者: Li, Weimin;Zhang, Yongqiang;Zhang, Chao;Pei, Xinwu;Wang, Zhixing;Jia, Shirong
作者机构:
关键词: Tobacco mosaic virus;Poly(A) tails;RNA polyadenylation
期刊名称: VIROLOGY
ISSN: 0042-6822
年卷期: 2014 年 454 卷
页码:
收录情况: SCI
摘要: Here we show that Tobacco mosaic virus (TMV), a positive-strand RNA virus known to end with 3' tRNA-like structures, does possess a small fraction of gRNA bearing polyadenylate tails. Particularly, many tails are at sites corresponding to the 3' end of near full length gRNA, and are composed of poly(A)-rich sequences containing the other nucleotides in addition to adenosine, resembling the degradation-stimulating poly(A) tails observed in all biological kingdoms. Further investigations demonstrate that these polyadenylated RNA species are not enriched in chloroplasts. Silencing of cpPNPase, a chloroplast-localized polynucleotide polymerase known to not only polymerize the poly(A)-rich tails but act as a 3' to 5' exoribonuclease, does not change the profile of polyadenylate tails associated with TMV RNA. Nevertheless, because similar tails were also detected in other phylogenetically distinct positive-strand RNA viruses lacking poly(A) tails, such kind of polyadenylation may reflect a common but as-yet-unknown interface between hosts and viruses. (c) 2014 Elsevier Inc. All rights reserved.
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