Pebp1 Suppresses Hiv Transcription And Induces Latency By Inactivating Mapk/Nf-Kappa B Signaling

The latent HIV-1 reservoir is a major barrier to viral eradication. However, our understanding of how HIV-1 establishes latency is incomplete. Here, by performing a genome-wide CRISPR-Cas9 knockout library screen, we identify phosphatidylethanolamine-binding protein 1 (PEBP1), also known as Raf kinase inhibitor protein (RKIP), as a novel gene inducing HIV latency. Depletion of PEBP1 leads to the reactivation of HIV-1 in multiple models of latency. Mechanistically, PEBP1 de-phosphorylates Raf1/ERK/I kappa B and IKK/I kappa B signaling pathways to sequestrate NF-kappa B in the cytoplasm, which transcriptionally inactivates HIV-1 to induce latency. Importantly, the induction of PEBP1 expression by the green tea compound epigallocatechin-3-gallate (EGCG) prevents latency reversal by inhibiting nuclear translocation of NF-kappa B, thereby suppressing HIV-1 transcription in primary CD4(+) T cells isolated from patients receiving antiretroviral therapy (ART). These results suggest a critical role for PEBP1 in the regulation of upstream NF-kappa B signaling pathways governing HIV transcription. Targeting of this pathway could be an option to control HIV reservoirs in patients in the future.