The Membrane-Bound Transcription Factor CREB3L1 Is Activated in Response to Virus Infection to Inhibit Proliferation of Virus-Infected Cells

SummaryCREB3L1/OASIS is a cellular transcription factor synthesized as a membrane-bound precursor and activated by regulated intramembrane proteolysis in response to stimuli like ER stress. Comparing gene expression between Huh7 subclones that are permissive for hepatitis C virus (HCV) replication versus the nonpermissive parental Huh7 cells, we identified CREB3L1 as a host factor that inhibits proliferation of virus-infected cells. Upon infection with diverse DNA and RNA viruses, including murine γ-herpesvirus 68, HCV, West Nile virus (WNV), and Sendai virus, CREB3L1 was proteolytically cleaved, allowing its NH2 terminus to enter the nucleus and induce multiple genes encoding inhibitors of the cell cycle to block cell proliferation. Consistent with this, we observed a necessity for CREB3L1 expression to be silenced in proliferating cells that harbor replicons of HCV or WNV. Our results indicate that CREB3L1 may play an important role in limiting virus spread by inhibiting proliferation of virus-infected cells.

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► Viral infection triggers proteolytic cleavage of membrane-bound CREB3L1
► The cleaved NH2-terminal fragment of CREB3L1 enters the nucleus
► Nuclear CREB3L1 activates genes inhibiting proliferation of virus-infected cells