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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Nucleoprotein phosphorylated on both serine and threonine is preferentially assembled into the nucleocapsids of measles virus.

The nucleoprotein (N) in the nucleocapsids of measles virus (MV) has different conformation and antigenicity than the free N-protein in MV-infected cells. These two forms of N-protein have identical methionine-containing tryptic peptides. The free N-protein contains 4 phosphorylated tryptic peptides. However, the nucleocapsid-associated N-protein has an additional phosphorylated peptide not found in the free N-protein. The free N-protein is phosphorylated only on serine residues, whereas the nucleocapsid-associated N-protein is phosphorylated on both serine and threonine residues. The MV N-protein expressed from a cloned gene in primate cells is also phosphorylated on both serine and threonine residues. These results suggest that cellular kinases phosphorylate the MV N-protein, and N-protein with phosphorylated serine and threonine is preferentially assembled into the viral nucleocapsids.[1]

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