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Enk, Jonatan; Levi, Assi; Weisblum, Yiska; Yamin, Rachel; Charpak-Amikam, Yoav; Wolf, Dana G.; Mandelboim, Ofer
Cell reports (Cambridge), 10/2016, Letnik: 17, Številka: 4Journal Article
Herpes simplex virus 1 (HSV1) is a ubiquitous human pathogen that utilizes variable mechanisms to evade immune surveillance. The glycosylphosphatidylinositol (GPI) anchoring pathway is a multistep process in which a myriad of different proteins are covalently attached to a GPI moiety to be presented on the cell surface. Among the different GPI-anchored proteins there are many with immunological importance. We present evidence that the HSV1-encoded miR H8 directly targets PIGT, a member of the protein complex that covalently attaches proteins to GPI in the final step of GPI anchoring. This results in a membrane down-modulation of several different immune-related, GPI-anchored proteins, including ligands for natural killer-activating receptors and the prominent viral restriction factor tetherin. Thus, we suggest that by utilizing just one of dozens of miRNAs encoded by HSV1, the virus can counteract the host immune response at several key points. Display omitted •HSV1 miR H8 targets PIGT of the GPI anchoring pathway•Expression of the anti-viral protein tetherin is reduced and viral spread enhanced•Expression of GPI-anchored activating NK cell ligands is reduced•Recognition and elimination by NK cells decrease Herpes simplex virus 1 is a ubiquitous human pathogen and the cause of several ailments. Enk et al. found that the HSV1-encoded miR H8 targets the GPI anchoring pathway, reducing expression of several immune-modulating proteins, thus enhancing viral spread and enabling evasion of natural killer cell elimination.
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