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. 1983 May 11;11(9):2815–2826. doi: 10.1093/nar/11.9.2815

Structure of the 5'-terminal untranslated region of the genomic RNAs from two strains of alfalfa mosaic virus.

M Ravelonandro, T Godefroy-Colburn, L Pinck
PMCID: PMC325925  PMID: 6856476

Abstract

We report the sequences of the 5'-terminal regions of the 3 Alfalfa Mosaic Virus genomic RNAs for the Strasbourg strain (AlMV-S) and for a new isolate, AlMV-B; they are compared to similar data obtained by Koper-Zwarthoff et al. (Nucleic Acids Res. 1980, 8, 5635-5647) for strain 425. The structure of these leaders is highly conserved in RNAs 1 and 2. The length of the leader is 102, 100 and 101 nucleotides in RNA1 for strains S, B and 425 respectively; 55 and 56 in RNA2 for strains S and B respectively. In RNA3 however, there are important differences near the 5'-terminus between strain S and the other two: The total leader length is 258 nucleotides for strain S and 242 for strain B. The secondary structure models show a conserved hairpin near the 5'-end of each genomic RNA of AlMV-S. This hairpin is inexistent in RNA3 of the B and 425 strains. The degree of base-pairing increases with leader length. The initiator codon is located in a single stranded region in RNA2 whereas it is found in a hairpin stem in RNA 3.

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