Identification of calcium-modulating cyclophilin ligand as a human host restriction to HIV-1 release overcome by Vpu |
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Authors: | Varthakavi Vasundhara Heimann-Nichols Ellen Smith Rita M Sun Yuehui Bram Richard J Ali Showkat Rose Jeremy Ding Lingmei Spearman Paul |
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Institution: | Department of Pediatrics, Division of Infectious Diseases, Vanderbilt University School of Medicine, 1161 21st Avenue South, D-7235 MCN, Nashville, Tennessee 37232-2581, USA. vasundhara.varthakavi@vanderbilt.edu |
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Abstract: | The HIV-1 Vpu protein is required for efficient viral release from human cells. For HIV-2, the envelope (Env) protein replaces the role of Vpu. Both Vpu and HIV-2 Env enhance virus release by counteracting an innate host-cell block within human cells that is absent in African green monkey (AGM) cells. Here we identify calcium-modulating cyclophilin ligand (CAML) as a Vpu-interacting host factor that restricts HIV-1 release. Expression of human CAML (encoded by CAMLG) in AGM cells conferred a strong restriction of virus release that was reversed by Vpu and HIV-2 Env, suggesting that CAML is the mechanistic link between these two viral regulators. Depletion of CAML in human cells eliminated the need for Vpu in enhancing HIV-1 and murine leukemia virus release. These results point to CAML as a Vpu-sensitive host restriction factor that inhibits HIV release from human cells. The ability of CAML to inhibit virus release should illuminate new therapeutic strategies against HIV. |
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