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m6A minimally impacts the structure, dynamics, and Rev ARM binding properties of HIV-1 RRE stem IIB


Autoři: Chia-Chieh Chu aff001;  Bei Liu aff001;  Raphael Plangger aff002;  Christoph Kreutz aff002;  Hashim M. Al-Hashimi aff001
Působiště autorů: Department of Biochemistry, Duke University School of Medicine, Durham, NC, United States of America aff001;  Institute of Organic Chemistry and Center for Molecular Biosciences CMBI, Universität Innsbruck, Innsbruck, Austria aff002;  Department of Chemistry, Duke University, Durham, NC, United States of America aff003
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0224850

Souhrn

N6-methyladenosine (m6A) is a ubiquitous RNA post-transcriptional modification found in coding as well as non-coding RNAs. m6A has also been found in viral RNAs where it is proposed to modulate host-pathogen interactions. Two m6A sites have been reported in the HIV-1 Rev response element (RRE) stem IIB, one of which was shown to enhance binding to the viral protein Rev and viral RNA export. However, because these m6A sites have not been observed in other studies mapping m6A in HIV-1 RNA, their significance remains to be firmly established. Here, using optical melting experiments, NMR spectroscopy, and in vitro binding assays, we show that m6A minimally impacts the stability, structure, and dynamics of RRE stem IIB as well as its binding affinity to the Rev arginine-rich-motif (ARM) in vitro. Our results indicate that if present in stem IIB, m6A is unlikely to substantially alter the conformational properties of the RNA. Our results add to a growing view that the impact of m6A on RNA depends on sequence context and Mg2+.

Klíčová slova:

HIV-1 – Melting – Methylation – NMR spectroscopy – RNA structure – Sodium phosphate – Viral replication – Fluorescence polarization


Zdroje

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