ORF3b is a gene found in coronaviruses of the subgenus Sarbecovirus, encoding a short non-structural protein. It is present in both SARS-CoV (which causes the disease SARS) and SARS-CoV-2 (which causes COVID-19), though the protein product has very different lengths in the two viruses. The encoded protein is significantly shorter in SARS-CoV-2, at only 22 amino acid residues compared to 153-155 in SARS-CoV. Both the longer SARS-CoV and shorter SARS-CoV-2 proteins have been reported as interferon antagonists. It is unclear whether the SARS-CoV-2 gene expresses a functional protein.
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