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Gene Review

GFLVs2gp1  -  polyprotein

Grapevine fanleaf virus

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Disease relevance of GFLVs2gp1


High impact information on GFLVs2gp1

  • A phosphorylated polyprotein of 90,000 daltons (p90) was immunoprecipitated from extracts of Y73-transformed chicken embryo cells by a variety of antisera reacting with gag gene products [4].
  • The grapevine fanleaf nepovirus 24K chymotrypsin-like cysteine proteinase, located between the VPg and the RNA polymerase in the RNA-1 encoded polyprotein P1, is active in its free form and in various precursors forms [5].
  • The positions of the cleavage sites within the polyprotein have been mapped and the genome organization of GFLV-F13 RNA2 has been established [1].
  • The region of the genomic RNA-1 from grapevine fanleaf virus isolate F13 (GFLV-F13), containing the proteinase cistron and flanking sequences (nucleotides 3894 to 4789) of the GFLV polyprotein, was modified by PCR mutagenesis to create a start codon and cloned in a transcription vector [6].
  • The Arg/Gly cleavage site deduced by N-terminal amino acid sequence analysis is the first for a nepovirus coat protein and for plant viruses expressing their genomic RNAs by polyprotein synthesis [7].

Biological context of GFLVs2gp1

  • The analysis of the N-terminal sequence of purified coat protein (CP) and identification of its C-terminal residue have allowed the CP cistron to be precisely positioned within the polyprotein [7].
  • These RNAs are 3753 nt (GDefV) and 4607 nt (GARSV) in size and contain a single open reading frame encoding a polyprotein of 122 kDa (GDefV) and 150 kDa (GARSV) [8].

Associations of GFLVs2gp1 with chemical compounds

  • The primary structure of the polyprotein includes a putative RNA-dependent RNA polymerase of 92K and a cysteine protease of 25K [9].


  1. Genome organization of grapevine fanleaf nepovirus RNA2 deduced from the 122K polyprotein P2 in vitro cleavage products. Margis, R., Ritzenthaler, C., Reinbolt, J., Pinck, M., Pinck, L. J. Gen. Virol. (1993) [Pubmed]
  2. Striking similarities in amino acid sequence among nonstructural proteins encoded by RNA viruses that have dissimilar genomic organization. Haseloff, J., Goelet, P., Zimmern, D., Ahlquist, P., Dasgupta, R., Kaesberg, P. Proc. Natl. Acad. Sci. U.S.A. (1984) [Pubmed]
  3. Intracellular precursors to the major glycoprotein of avian oncoviruses in chicken embryo fibroblasts. Buchhagen, D.L., Hanafusa, H. J. Virol. (1978) [Pubmed]
  4. Characterization of Y73, an avian sarcoma virus: a unique transforming gene and its product, a phosphopolyprotein with protein kinase activity. Kawai, S., Yoshida, M., Segawa, K., Sugiyama, H., Ishizaki, R., Toyoshima, K. Proc. Natl. Acad. Sci. U.S.A. (1980) [Pubmed]
  5. Differential proteolytic activities of precursor and mature forms of the 24K proteinase of grapevine fanleaf nepovirus. Margis, R., Viry, M., Pinck, M., Bardonnet, N., Pinck, L. Virology (1994) [Pubmed]
  6. Cloning and in vitro characterization of the grapevine fanleaf virus proteinase cistron. Margis, R., Viry, M., Pinck, M., Pinck, L. Virology (1991) [Pubmed]
  7. RNA2 of grapevine fanleaf virus: sequence analysis and coat protein cistron location. Serghini, M.A., Fuchs, M., Pinck, M., Reinbolt, J., Walter, B., Pinck, L. J. Gen. Virol. (1990) [Pubmed]
  8. Complete nucleotide sequence of the RNA-2 of grapevine deformation and Grapevine Anatolian ringspot viruses. Ghanem-Sabanadzovic, N.A., Sabanadzovic, S., Digiaro, M., Martelli, G.P. Virus Genes (2005) [Pubmed]
  9. Complete nucleotide sequence and genetic organization of grapevine fanleaf nepovirus RNA1. Ritzenthaler, C., Viry, M., Pinck, M., Margis, R., Fuchs, M., Pinck, L. J. Gen. Virol. (1991) [Pubmed]
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