Base de dados : LILACS
Pesquisa : D12.776.543.990.300.300 [Categoria DeCS]
Referências encontradas : 3 [refinar]
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Fotocópia
Id: lil-335989
Autor: Sabatini, David D; Adesnik, Milton; Ivanov, Ivanov E; Simon, Jean-Pierre.
Título: Mechanism of formation of post Golgi vesicles from TGN membranes: Arf-dependent coat assembly and PKC-regulated vesicle scission
Fonte: Biocell;20(3):287-300, Dec. 1996.
Idioma: en.
Resumo: We have developed an experimental system that utilizes purified Golgi fractions obtained from virus infected infected MDCK cells to reproduce in vitro the process of vesicle generation in the trans Golgi network, an important site for the sorting of proteins addressed to the plasma membrane, secretory vesicles, or lysosomes. Using an integrated biochemical and electron microscopic approach, we have shown that the formation of post Golgi vesicles carrying proteins destined to both plasma membrane domains of epithelial cells requires the activation of an ArF-like GTP-binding protein that serves to promote the assembly of the protein coat necessary to deform the donor membrane and generate a vesicle. The formation of the post Golgi vesicles also requires the participation of a Golgi membrane-associated Protein Kinase C, but not its phosphorylating activity. Other authors have shown that this is also the case for the PKC activation of the enzyme phospholipase D, which generates phosphatidic acid from phosphatidyl choline and may be involved in remodeling of membranes. We have been able to dissect the process of post Golgi vesicle generation into two sequential stages, one of coat assembly and bud formation, and a subsequent one of vesicle scission. The first stage can occur at 20 degrees C and requires the activation of the Arf protein necessary for coat assembly. The second stage does not require nucleotides or an energy supply, but requires cytosolic proteins, and in particular, an NEM sensitive membrane scission promoting activity that operates only at a higher temperature of incubation. Because various PKC inhibitors blocked vesicle scission without preventing bud formation, we propose that the PKC is required for the activation of a PLD in the TGN, which leads to remodeling of the donor membrane and the severing of connections between the emerging vesicles and the membranes.
Descritores: Complexo de Golgi
Membranas Intracelulares
Proteína Quinase C/fisiologia
Proteínas Virais/fisiologia
Vesículas Revestidas/fisiologia
-Transporte Biológico
Linhagem Celular
Sistema Livre de Células
Proteína Coatomer
Fosfatidilinositóis/fisiologia
Guanosina Trifosfato
Rim
Lisossomos
Fosfolipase D
Proteínas de Membrana/metabolismo
Limites: Animais
Cães
Tipo de Publ: Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.
Responsável: BR1.1 - BIREME


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Fotocópia
Id: lil-335987
Autor: Berón, Walter.
Título: Let's think about coat proteins
Fonte: Biocell;20(3):307-312, Dec. 1996.
Idioma: en.
Descritores: Proteínas de Membrana/classificação
Vesículas Revestidas/metabolismo
-Transporte Biológico
Clatrina
Proteína Coatomer
Guanosina Trifosfato
Substâncias Macromoleculares
Modelos Biológicos
Proteínas de Membrana/metabolismo
Proteínas Fúngicas/metabolismo
Proteínas Virais/metabolismo
Saccharomyces cerevisiae
Limites: Animais
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME


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Fotocópia
Id: lil-335980
Autor: Alvarez-Dominguez, Carmen.
Título: Vesicular transport of microorganisms in macrophages
Fonte: Biocell;20(3):355-365, Dec. 1996.
Idioma: en.
Descritores: Macrófagos/microbiologia
Fagocitose
Vesículas Revestidas/microbiologia
-Bacteriólise
Transporte Biológico
Proteína Coatomer
Endocitose
Guanosina Trifosfato
Lisossomos
Macrófagos/fisiologia
Macrófagos/ultraestrutura
Fusão de Membrana
Proteínas Associadas aos Microtúbulos/fisiologia
Limites: Animais
Responsável: BR1.1 - BIREME



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