The 3′-terminal 1500 nucleotides of the genome of pelargonium flower break carmovirus (PFBV) were sequenced from RT-PCR amplification products. One large ORF was found, encoding a 345 amino acid protein of Mr 37 kDa, which corresponds to the coat protein, as confirmed by immunoprecipitation of products of in vitro transcription and translation. The sequence also included the putative promoter of the coat protein gene subgenomic RNA, as well as its 5′ and 3′ untranslated regions. The PFBV coat protein was more similar to that of saguaro cactus virus and carnation mottle virus than to that of other carmoviruses. Despite the lower level of similarity of CP gene sequences compared to the RNA dependent RNA polymerase (RdRp) gene sequences of small icosahedral viruses used in taxonomic studies, PFBV CP sequence comparisons and alignments confirmed that PFBV is related to carmoviruses, tombusviruses and a dianthovirus, as previously concluded from the analysis of a PFBV RdRp gene fragment.
Archives of Virology – Springer Journals
Published: Sep 1, 1998
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