Trans complementation of virus-encoded replicase components of tobacco mosaic virus.
ABSTRACT We examined whether the 130K and 180K proteins of tobacco mosaic virus (TMV), the putative virus-encoded replicase components, produced by a replication-competent TMV mutant could complement a replication-defective mutant in a single cell. The replication-competent mutant (LDCS29) had a deletion in the coat protein gene and the replication-defective mutant (LDR28) had a large deletion in the gene encoding the 130K and 180K proteins. Neither the replication of LDR28 nor the production of the coat protein from LDR28 or LDCS29 was detected when the mutants were inoculated separately into tobacco protoplasts. However, when the two mutants were co-inoculated, the production of the LDR28 genomic RNA and the subgenomic RNA for the coat protein and accumulation of the coat protein were observed. These results show that the virus-encoded replicase components of TMV complemented the replication-defective mutant in trans.
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ABSTRACT: Chronic obstructive pulmonary disease and asthma are both highly prevalent inflammatory diseases characterized by airway obstruction with distinct pathogenic mechanisms and different degrees of response to antiinflammatory therapy. However, forms of presentation that show overlap between both diseases and which are not clearly represented in clinical trials are frequently encountered in clinical practice. These patients may show accelerated loss of pulmonary function and have a worse prognosis. Therefore their early identification is essential. Biomarkers such as bronchial hyperreactivity or nitric oxide in exhaled air have yielded discrepant results. Phenotypic characterization will allow treatment with inhaled corticosteroids to be individually tailored and optimized.Archivos De Bronconeumologia - ARCH BRONCONEUMOL. 01/2010; 46:2-7.
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ABSTRACT: Several strains of soybean mosaic virus (SMV) can be differentiated on the basis of the phenotypic response of various soybean cultivars (e.g., the soybean line Williams ‘82 is susceptible to all SMV strains, whereas the lines P. I. 96983, L78-379, and Davis are functionally immune to SMV strain G2 but susceptible to strains G7 and G7a). Inoculation of the immune lines with G2, followed 2 days later by inoculation with G7 or G7a, resulted in systemic spread of the avirulent SMV G2. Further evidence, suggests that complementation groups of SMV strains may exist.Journal of Phytopathology 06/2008; 143(4):247 - 250. · 1.00 Impact Factor
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ABSTRACT: Hibiscus latent Singapore virus (HLSV) is a member of Tobamovirus and its full-length cDNA clones were constructed. The in vitro transcripts from two HLSV full-length cDNA clones, which contain a hepta-adenosine stretch (pHLSV-7A) and an octo-adenosine stretch (pHLSV-8A), are both infectious. The replication level of HLSV-7A in Nicotiana benthamiana protoplasts was 5-fold lower, as compared to that of HLSV-8A. The replicase proteins of HLSV-7A were produced through programmed −1 ribosomal frameshift (−1 PRF) and the 7A stretch was a slippery sequence for −1 PRF. Mutations to the downstream pseudoknot of 7A stretch showed that the pseudoknot was not required for the frameshift in vitro. The stretch was found to be extended to 8A after subsequent replication cycles in vivo. It is envisaged that HLSV employs the monotonous runs of A and −1 PRF to convert its 7A to 8A to reach higher replication for its survival in plants.Virology 01/2014; 449:229–234. · 3.35 Impact Factor