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Texto completo SciELO Brasil
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Id: lil-454794
Autor: Velandia, Myriam L; Pérez-Castro, Rosalía; Hurtado, Hernán; Castellanos, Jaime E.
Título: Ultrastructural description of rabies virus infection in cultured sensory neurons
Fonte: Mem. Inst. Oswaldo Cruz;102(4):441-447, June 2007. ilus, tab.
Idioma: en.
Projeto: Instituto Colombiano para la Ciencia y la Tecnología.
Resumo: Primary cultures were made from adult mouse spinal ganglia for depicting an ultrastructural description of rabies virus (RABV) infection in adult mouse sensory neuron cultures; they were infected with rabies virus for 24, 36, and 48 h. The monolayers were processed for transmission electron microscopy and immunochemistry studies at the end of each period. As previously reported, sensory neurons showed great susceptibility to infection by RABV; however, in none of the periods evaluated were assembled virions observed in the cytoplasm or seen to be associated with the cytoplasmic membrane. Instead, fibril matrices of aggregated ribonucleoprotein were detected in the cytoplasm. When infected culture lysate were inoculated into normal animals via intra-cerebral route it was observed that these animals developed clinical symptoms characteristic of infection and transmission electron microscopy revealed assembled virions in the cerebral cortex and other areas of the brain. Sensory neurons infected in vitro by RABV produced a large amount of unassembled viral ribonucleoprotein. However, this intracellular material was able to produce infection and virions on being intra-cerebrally inoculated. It can thus be suggested that the lack of intracellular assembly in sensory neurons forms part of an efficient dissemination strategy.
Descritores: Gânglios Espinais/virologia
Neurônios Aferentes/virologia
Vírus da Raiva/ultraestrutura
-Células Cultivadas
Modelos Animais de Doenças
Gânglios Espinais/ultraestrutura
Microscopia Eletrônica de Transmissão
Neurônios Aferentes
Vírus da Raiva/fisiologia
Fatores de Tempo
Montagem de Vírus
Limites: Animais
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME

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Texto completo SciELO Brasil
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Id: lil-309202
Autor: Vidal, M. S; Margis, R.
Título: The 42-kDa coat protein of Andean potato mottle virus acts as a transcriptional activator in yeast
Fonte: Braz. j. med. biol. res = Rev. bras. pesqui. méd. biol;35(4):411-420, Apr. 2002. ilus, tab.
Idioma: en.
Resumo: Interactions of viral proteins play an important role in the virus life cycle, especially in capsid assembly. Andean potato mottle comovirus (APMoV) is a plant RNA virus with a virion formed by two coat proteins (CP42 and CP22). Both APMoV coat protein open reading frames were cloned into pGBT9 and pGAD10, two-hybrid system vectors. HF7c yeast cells transformed with the p9CP42 construct grew on yeast dropout selection media lacking tryptophan and histidine. Clones also exhibited ß-galactosidase activity in both qualitative and quantitative assays. These results suggest that CP42 protein contains an amino acid motif able to activate transcription of His3 and lacZ reporter genes in Saccharomyces cerevisiae. Several deletions of the CP42 gene were cloned into the pGBT9 vector to locate the region involved in this activation. CP42 constructions lacking 12 residues from the C-terminal region and another one with 267 residues deleted from the N-terminus are still able to activate transcription of reporter genes. However, transcription activation was not observed with construction p9CP42deltaC57, which does not contain the last 57 amino acid residues. These results demonstrate that a transcription activation domain is present at the C-terminus of CP42 between residues 267 and 374
Descritores: Capsídeo
Saccharomyces cerevisiae
Solanum tuberosum
Ativação Transcricional
Montagem de Vírus
-DNA de Plantas
Reação em Cadeia da Polimerase
Técnicas do Sistema de Duplo-Híbrido
Responsável: BR1.1 - BIREME

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