Interaction of the papillomavirus E8--E2C protein with the cellular CHD6 protein contributes to transcriptional repression.

Journal of Virology
Jasmin FerteyFrank Stubenrauch

Abstract

Expression of the E6 and E7 oncogenes of high-risk human papillomaviruses (HPV) is controlled by cellular transcription factors and by viral E2 and E8--E2C proteins, which are both derived from the HPV E2 gene. Both proteins bind to and repress the HPV E6/E7 promoter. Promoter inhibition has been suggested to be due to binding site competition with cellular transcription factors and to interactions of different cellular transcription modulators with the different amino termini of E2 and E8--E2C. We have now identified the cellular chromodomain helicase DNA binding domain 6 protein (CHD6) as a novel interactor with HPV31 E8--E2C by using yeast two-hybrid screening. Pull-down and coimmunoprecipitation assays indicate that CHD6 interacts with the HPV31 E8--E2C protein via the E2C domain. This interaction is conserved, as it occurs also with the E8--E2C proteins expressed by HPV16 and -18 and with the HPV31 E2 protein. Both RNA knockdown experiments and mutational analyses of the E2C domain suggest that binding of CHD6 to E8--E2C contributes to the transcriptional repression of the HPV E6/E7 oncogene promoter. We provide evidence that CHD6 is also involved in transcriptional repression but not activation by E2. Taken together our r...Continue Reading

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Citations

May 23, 2014·Leukemia & Lymphoma·Nathalie Douet-GuilbertMarc De Braekeleer
Nov 21, 2012·Microbial Pathogenesis·Chai Ling Pang, Françoise Thierry
Jul 16, 2013·Virology·Alison A McBride
Jun 22, 2016·The Journal of General Virology·Mikk Puustusmaa, Aare Abroi
Nov 9, 2016·Virus Research·Marcel DreerFrank Stubenrauch
Jan 21, 2017·Molecular & Cellular Proteomics : MCP·Alison A McBride
Mar 12, 2013·Nature Reviews. Microbiology·Cecilia Johansson, Stefan Schwartz
Jan 18, 2019·Nature Communications·Shaun MooreAaron A Goodarzi

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