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Human-APOBEC3G-dependent restriction of porcine endogenous retrovirus replication is mediated by cytidine deamination and inhibition of DNA strand transfer during reverse transcription

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Abstract

Although human apolipoprotein B mRNA-editing enzyme catalytic polypeptide-like 3G (APOBEC3G, hA3G)-mediated deamination is the major mechanism used to restrict the infectivity of a broad range of retroviruses, it is unclear whether porcine endogenous retrovirus (PERV) is affected by hA3G or porcine A3F (poA3F). To determine whether DNA deamination is required for hA3G- and poA3F-dependent inhibition of PERV transmission, we developed VSV-pseudotype PERV-B expressing hA3G, mutant hA3G-E67Q (encapsidation and RNA binding activity-deficient), mutant hA3G-E259Q (deaminase-deficient), or poA3F. hA3G-E67Q decreased virus infectivity by ~ 93% compared to the ~ 99% decrease of viral infectivity by wild-type hA3G, while hA3G-E259Q decreased the infectivity of PERV-B by ~ 35%. These data suggest that cytidine deamination activity is crucial for efficient restriction of PERV by hA3G, but cytidine deamination cannot fully explain the inactivation of PERV by hA3G. Furthermore, differential DNA denaturation PCR (3D-PCR) products from 293T cells infected with PERV-B expressing hA3G mutants were sequenced. G-to-A hypermutation was detected at a frequency of 4.1% for hA3G, 3.4% for hA3G-E67Q, and 4.7% for poA3F. These results also suggest that hA3G and poA3F inhibit PERV by a deamination-dependent mechanism. To examine the effect of hA3G on the production of PERV DNA, genomic DNA was extracted from 293T cells 12 h after infection with PERV expressing hA3G, and this DNA was used as template for real-time PCR. A 50% decrease in minus strand strong stop (-sss) DNA synthesis/transfer was observed in the presence of hA3G. Based on these results, we conclude that hA3G may restrict PERV by both deamination-dependent mechanisms and inhibition of DNA strand transfer during PERV reverse transcription.

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Acknowledgements

This work was supported in part by DANKOOK ChemBio Specialization for Creative Korea-II.

Funding

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education (2017R1D1A1B03032753).

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Authors and Affiliations

  1. Department of Microbiology, Dankook University, Cheonan, 330-714, Korea

    Sae Young Jin, Hyung Yell Choi, Han Sol Kim & Yong-Tae Jung

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  1. Sae Young Jin
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  2. Hyung Yell Choi
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Correspondence to Yong-Tae Jung.

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Handling Editor: Chan-Shing Lin.

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Jin, S.Y., Choi, H.Y., Kim, H.S. et al. Human-APOBEC3G-dependent restriction of porcine endogenous retrovirus replication is mediated by cytidine deamination and inhibition of DNA strand transfer during reverse transcription. Arch Virol 163, 1907–1914 (2018). https://doi.org/10.1007/s00705-018-3822-x

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  • DOI: https://doi.org/10.1007/s00705-018-3822-x

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