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Matrix Protein of Cell-associated Subacute Sclerosing Panencephalitis Viruses

Department of Measles Virus, National Institute of Health Gakuen, Musashimurayama, Tokyo 190-12, Japan

The nucleotide sequence has been determined for the matrix (M) protein gene of three strains, Niigata-1, ZH and Biken, of cell-associated subacute sclerosing panencephalitis (SSPE) virus. The M proteins of the Niigata-1 and ZH strains were found to terminate prematurely as a result of nonsense mutations at nucleotide positions 68 and 96 respectively. On the other hand it was predicted that the Biken strain would express M protein with 22 amino acid differences and eight additional amino acids at its C terminus in comparison to the M protein of the Edmonston strain of measles virus. Radiolabelling of cells carrying the Biken strain showed the production of an M protein with considerably altered immunoreactivity and a marked reduction in intracellular stability. Either premature termination or rapid degradation of the M protein may underlie the defectiveness of these three strains of SSPE virus.

Keywords: SSPE, matrix protein, nucleotide sequence

Received 6 February 1989; accepted 20 April 1989.

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