Structure, function and antigenicity of the SARS-CoV-2 spike glycoprotein part 49



Subsequent work suggested that a glycan present near the S1/S2 boundary accounted for the lack of proteolytic priming of HKU4 S and that its removal enhanced pseudovirus entry in human cells. The presence of a polybasic cleavage site, that can be processed by furin-like proteases, is a signature of several  highly pathogenic avian influenza viruses and pathogenic Newcastle disease virus.

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