Abstract
RNA 3 of alfalfa mosaic virus (AlMV) contains information for two genes: near the 5' end an active gene coding for a 35 Kd protein and, near the 3' end, a silent gene coding for viral coat protein. We have determined a sequence of 318 nucleotides which contains the potential initiation codon for the 35 Kd protein at 258 nucleotides from the 5' end. This long leader sequence can form initiation complexes containing three 80 S ribosomes. A shorter species of RNA, corresponding to a molecule of RNA 3 lacking the cap and the first 154 nucleotides (RNA 3') has been isolated. The remaining leader sequence of 104 nucleotides in RNA 3' forms a single 80 S initiation complex with wheat germ ribosomes. The location of the regions of the leader sequence of RNA 3 involved in initiation complex formation with 80 S ribosomes is reported.
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