Variability of the N-protein and the intergenic region of the S RNA of tomato spotted wilt tospovirus (TSWV)

The genetic heterogeneity of the N protein gene and the intergenic region (IGR) of the S RNA from tomato spotted wilt virus (TSWV) isolates, collected in Bulgaria, were compared with isolates from other parts of the world. The results substantiated the highly conserved nature of the N protein. Twent...

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Bibliographic Details
Published inThe New microbiologica Vol. 24; no. 2; p. 175
Main Authors Heinze, C, Letschert, B, Hristova, D, Yankulova, M, Kauadjouor, O, Willingmann, P, Atanassov, A, Adam, G
Format Journal Article
LanguageEnglish
Published Italy 01.04.2001
Subjects
Amino Acid Sequence
Base Sequence
Bulgaria
Cluster Analysis
Conserved Sequence
Genes, Viral - genetics
Genetic Variation - genetics
Lycopersicon esculentum - virology
Molecular Sequence Data
Nucleic Acid Conformation
Nucleocapsid - genetics
Phylogeny
RNA, Viral - chemistry
RNA, Viral - genetics
Sequence Alignment
Sequence Homology
Serology
Tospovirus - classification
Tospovirus - genetics
Bulgaria
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Summary:The genetic heterogeneity of the N protein gene and the intergenic region (IGR) of the S RNA from tomato spotted wilt virus (TSWV) isolates, collected in Bulgaria, were compared with isolates from other parts of the world. The results substantiated the highly conserved nature of the N protein. Twenty six independent sequences revealed only seven variable amino acid positions, common to all isolates. The type of amino acids present in these positions seems to be independent of the geographical origin. In contrast to the structural N protein, comparisons of the related IGR-sequences led to clusters correlated with the geographical origin of the isolates. Although the overall sequence homology in the IGRs was much lower than for the N proteins, three conserved parts within this region were identified. The outstanding part was a central area of 31 nucleotides with a significantly increased GC-content. This was located in both viral- and viral-complement RNA at structures with similar foldings, which led to the assumption that this stabilised structure, rather than a sequence motive, might serve as a transcription terminator during the synthesis of the two mRNAs from the ambisense segments.
ISSN:1121-7138