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The membrane (M1) protein of influenza virus was found to be heterogenous and to occur in two forms in the virus particle. The two forms of M1 were found in virus which was produced both early and late after infection and in infected cells. The two forms could be separated on polyacrylamide gels under specific conditions. The two components of M1 contained similar tryptic peptides. However, a small proteolytic difference between the two proteins could not be ruled out. Both M1 proteins were present in phosphorylated form in the virus particle. The phosphorylated M1 components were not readily distinguished from phosphorylated nonstructural protein (NS1) when cytoplasm of infected cells was analyzed on polyacrylamide gels. The two phosphorylated M1 components could, however, be detected in infected cells by immunoprecipitation. One M1 component contained only phosphoserine whereas the second contained phosphoserine and a small amount of phosphothreonine as well. In addition to the phosphorylated nucleoprotein and M1, a third phosphorylated protein was routinely detected in virus particles. It was a surface component of the virus, since it could be removed from whole virus with chymotrypsin and contained phosphate at serine residues. The identity of this component was not known.

The membrane (M1) protein of influenza virus occurs in two forms and is a phosphoprotein