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. 1993 Mar 25;21(6):1361–1367. doi: 10.1093/nar/21.6.1361

Role of the 5' leader sequence of alfalfa mosaic virus RNA 3 in replication and translation of the viral RNA.

E A van der Vossen 1, L Neeleman 1, J F Bol 1
PMCID: PMC309320  PMID: 8464726

Abstract

RNA 3 of alfalfa mosaic virus (AIMV) encodes the movement protein P3 and the viral coat protein which is translated from the subgenomic RNA 4. The 5'-leader sequences of RNA 3 of AIMV strains S, A, and Y differ in length from 314 to 392 nucleotides and contain a variable number of internal control regions of type 2 (ICR2 motifs) each located in a 27 nt repeat. Infectious cDNA clones were used to exchange the leader sequences of the three strains. This revealed that the leader sequence controls the specific ratio in which RNAs 3 and 4 are synthesized for each strain. In addition, it specifies strain specific differences in the kinetics of P3 accumulation in plants. Subsequent deletion analysis revealed that a 5'-sequence of 112 nt containing one ICR2 motif was sufficient for a 10 to 20% level of RNA 3 accumulation in protoplasts and a delayed accumulation in plants. An additional leader sequence of maximally 114 nt, containing two ICR2 motifs, was required to permit wildtype levels of RNA 3 accumulation. The effect of deletions in the leader sequence on P3 synthesis in vitro and in vivo was investigated.

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