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The replication of canine distemper virus (CDV) in Vero cells was found to require certain amino acids such as arginine, methionine and valine. The deprivation of methionine caused the most marked reduction in virus yield. In cells cultured in medium deprived of methionine, the early processes of viral replication such as adsorption, penetration and uncoating of virus occurred at normal rates, but the syntheses of viral RNA and protein were markedly reduced. The addition of S-adenosylmethionine to methionine-free medium resulted in the growth of CDV to the level obtained in cells with complete medium. Moreover, cycloleucine, which is known to reduce the methylation of mRNA by inhibiting the synthesis of S-adenosylmethionine, also inhibited the growth of CDV, and the addition of methionine or S-adenosylmethionine reversed the inhibitory effect of cycloleucine. The possibility of an inhibition of methylation of mRNA in methionine-deprived cells is discussed.

Requirement of Methionine for the Replication of Canine Distemper Virus in Vero Cells