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coronavirus non-structural protein 4 (Nsp4) transmembrane domain Nsp4 may be involved in coronavirus-induced membrane remodeling. In order to assemble the replication-transcription complex (RTC), coronavirus induces the rearrangement of host endoplasmic reticulum (ER) membrane into double membrane vesicles (DMVs), zippered ER, or ER spherules. DMV formation has been observed in SARS-CoV cells overexpressing the three transmembrane-containing non-structural proteins of viral replicase polyprotein 1ab: Nsp3, Nsp4 and Nsp6. Together, Nsp3, Nsp4, and Nsp6 have the ability to induce the formation of DMVs that are similar to those seen in SARS-CoV-infected cells. |
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