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The nucleotide sequence at the junction between the nonstructural and the structural genes of the Semliki Forest virus 42S RNA genome has been determined from cloned cDNA. With the aid of S1-mapping, we have located the 5' end of the viral 26S RNA on this sequence. The 26S RNA is homologous to the 3' end of the 42S RNA and is used as a messenger for the structural proteins of the virus. The nucleotide sequence in the noncoding 5' region of the 26S RNA (51 bases) was thus established, completing the primary structure of the 26S RNA molecule (for earlier sequence work, see Garoff et al., Proc. Natl. Acad. Sci. U.S.A. 77:6376-6380, 1980, and Garoff et al., Nature (London) 288:236-241, 1980). An examination of the nucleotide sequences upstream from the initiator codon for the structural proteins on the 42S RNA genome shows that all reading frames are effectively blocked by stop codons, which means that the nonstructural genes in the 5' end of the 42S RNA molecule do not overlap with the structural ones at the 3' end of the molecule.

Nucleotide sequence at the junction between the nonstructural and the structural genes of the semliki forest virus genome