A Study of Phosphorylation of the Measles Membrane Protein

Abstract
A polypeptide (designated X) which migrates with a mobility similar to the membrane protein (M) of measles virus was found in virus-infected [African green monkey kidney Vero] cells. This polypeptide appears to be phosphorylated. Limited proteolysis has shown that this protein is not a phosphorylated form of the M protein, but appears related to the polymerase protein of measles virus.