RNA binding and R-loop formation by the herpes simplex virus type-1 single-stranded DNA-binding protein (ICP8)

Nucleic Acids Research
Paul E Boehmer

Abstract

In an effort to decipher the molecular mechanisms of homologous recombination during herpes simplex virus type-1 replication, we recently demonstrated that the virus-encoded single-stranded (ss) DNA-binding protein (ICP8) promotes the salt-dependent assimilation of ssDNA into a homologous plasmid, resulting in the formation of a displacement loop. In this paper, the results presented show for the first time a direct interaction between ICP8 and RNA. ICP8 binds to RNA with positive cooperativity but with approximately 5-fold lower affinity than to ssDNA. In addition, competition experiments indicate that the dissociation rate of ICP8 from RNA is faster than from ssDNA, although it is also dependent on the nature of the challenger. Importantly, ICP8 can promote the salt-dependent assimilation of RNA into a homologous acceptor plasmid to generate a joint molecule in which the RNA is stably paired with the complementary strand of the acceptor DNA, indicative of an R-loop. These findings have important implications on the role of ICP8 in mediating recombination reactions using viral transcripts. The RNA-binding activity of ICP8 also provides a molecular basis for its role in the regulation of viral gene expression.

References

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Citations

Dec 11, 2007·Journal of Structural Biology·E MumtsiduP A Tucker
Jun 29, 2011·Virus Research·Ambra Lo PianoSilvia Ayora
Dec 17, 2014·Cell Reports·Zhong DengPaul M Lieberman
Dec 3, 2014·Biochemical and Biophysical Research Communications·Kanchi Ravi RupeshPaul E Boehmer
Jan 4, 2019·PLoS Genetics·Viktor PosseClaes M Gustafsson
Apr 16, 2020·PLoS Pathogens·Julie Tai-SchmiedelNoam Stern-Ginossar
Apr 15, 2020·Nature Communications·Célia AleckiNicole J Francis
Aug 17, 2020·The Journal of Biological Chemistry·Olga M MazinaAlexander V Mazin
Oct 15, 2019·Cell·Tatiana García-Muse, Andrés Aguilera

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