What Is The Role Of Ubiquitin In Host Cells

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What Is The Role Of Ubiquitin In Host Cells

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As new viral proteins are being made, essentially to assemble new virions, host proteins - ubiquitin - can tag to these viral proteins. Once ubiquitin has tagged one of these proteins, it is carried to the proteasome, where the peptide chain is "fed" into the proteasome and partially digested into shorter peptide fragments. These shorter fragments are acted upon by additional peptidase enzymes that are present in the cytoplasm and broken up into smaller peptide. Those peptides then travel to the ER, gain entry through a molecule called TAP, and once inside the ER if they are the right conformation they will bind into the binding groove of a developing MHC class 1 molecule. They are then carried to the cell surface from the ER where they then get embedded into the surface of the cell, ultimately signaling cytotoxic T cells that foreign protein is inside the cell.
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