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Multiple forms of the vesicular stomatitis virus nucleocapsid protein N have been detected in infected cells. One form is complexed with the viral NS protein in a 1:1 molar ratio, and the other forms are distinguished by their more rapid sedimentation rates on glycerol gradients. I performed a series of experiments designed to analyze the relationships between these forms of the N protein. Pulse-chase experiments demonstrate that the N protein is made first as the form which binds to the NS protein, forming a 1-to-1 molar complex, and that with increasing times of chase it is either assembled into nucleocapsids or converted to the two higher sedimenting forms. Using a newly developed quantitative immunoblotting procedure, I have quantitated the three differentially sedimenting species of the N protein and have shown that at later times postinfection (6 to 7 h), the faster-sedimenting forms of the N protein account for as much as 50% of the soluble N protein in the cell. The activity of these forms has been assessed, with only the 1-to-1 molar N-NS complex demonstrating the ability to support the replication and encapsidation of viral genomic RNA. A model for the conversion of the N protein from the active N-NS complex into the other forms of the protein is presented, and the possible function of the N-protein self-complexes is discussed.

Kinetic, quantitative, and functional analysis of multiple forms of the vesicular stomatitis virus nucleocapsid protein in infected cells