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Primary structure and gene organization of the middle-component RNA of cowpea mosaic virus.

van Wezenbeek P., Verver J., Harmsen J., Vos P., van Kammen A.

Middle component RNA (M RNA) of cowpea mosaic virus (CPMV) was transcribed into cDNA and double-stranded cDNA was inserted into the EcoRI site of plasmid pBRH2. The nucleotide sequence of inserts was determined, after subcloning in bacteriophages M13mp7, M13mp8 or M13mp9, by the dideoxy chain termination method. The complete sequence of CPMV M RNA, up to the poly(A) tail, is 3481 nucleotides long. The sequence contains a long open reading frame starting at nucleotide 161 from the 5' terminus and continuing to 180 nucleotides from the 3' terminus. The sequence does not contain a polyadenylation signal for the poly(A) tail at the 3' end of CPMV RNA. The initiation site at position 161 together with AUG codons in the same reading frame at positions 512 and/or 524 account for the two large colinear precursor polypeptides translated in vitro from M RNA. The amino acid sequence deduced from the nucleotide sequence suggests that both precursor polypeptides are proteolytically cleaved at glutaminyl-methionine and glutaminyl-glycine, respectively, to produce the two viral capsid proteins.

EMBO J. 2:941-946(1983) [PubMed] [Europe PMC]

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