Virus membrane-fusion proteins: more than one way to make a hairpin

摘要

The nomenclature and organization of the class I proteins of influenza virus and HIV and the class II proteins of flaviviruses and alphaviruses are indicated. For class I, labels specify the positions of the fusion peptides (FP), processing sites (arrows) and transmembrane regions (TM). For class II, signalase cleavage sites are indicated by black arrows, furin-processing sites by red arrows, the capsid protease cleavage site by a green arrow and TM regions are light blue. The intervening 6K segment is unique to alphaviruses. Residue numbers are in parentheses.