Genome organization of grapevine fanleaf nepovirus RNA2 deduced from the 122K polyprotein P2 in vitro cleavage products.
The full-length transcript of grapevine fanleaf virus (GFLV) RNA2 produces a primary product of 122K when translated in the rabbit reticulocyte system. This 122K polyprotein is completely processed in vitro by the RNA1-encoded 24K proteinase. The positions of the cleavage sites within the polyprotein have been mapped and the genome organization of GFLV-F13 RNA2 has been established. The order of mature proteins in the 122K polyprotein is the amino-terminal 28K protein, the 38K protein followed by the 56K coat protein at the carboxy terminus. These proteins represent the final cleavage products of the 122K polyprotein. A 66K protein which yields 28K and 38K proteins constitutes the major maturation intermediate. Microsequencing of the amino extremity of radioactively labelled 38K protein allowed identification of the Cys257/Ala258 site as the cleavage site recognized by the GFLV proteinase between the 28K and the 38K proteins in the 66K protein in addition to the Arg605/Gly606 site between the 38K protein and the coat protein.
Institut de Biologie Moléculaire des Plantes du C.N.R.S., Université Louis Pasteur, Strasbourg, France.
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Margis
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Ritzenthaler
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Reinbolt
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Pinck
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Pinck
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D016679:Genome, Viral; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009838:Oligodeoxyribonucleotides; D010942:Plant Viruses / Q000235:genetics / Q000378:metabolism*; D016133:Polymerase Chain Reaction; D014176:Protein Biosynthesis; D012367:RNA, Viral / Q000235:genetics*; D011817:Rabbits; D012156:Reticulocytes / Q000378:metabolism; D014158:Transcription, Genetic; D014764:Viral Proteins / Q000096:biosynthesis* / Q000302:isolation & purification; D014771:Virion / Q000235:genetics / Q000378:metabolism
D009838:Oligodeoxyribonucleotides; D012367:RNA, Viral; D014764:Viral Proteins