Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 1 de 1
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
J Cell Biol ; 152(3): 563-78, 2001 Feb 05.
Artigo em Inglês | MEDLINE | ID: mdl-11157983

RESUMO

The intracellular protozoan parasite Toxoplasma gondii shares with other members of the Apicomplexa a common set of apical structures involved in host cell invasion. Micronemes are apical secretory organelles releasing their contents upon contact with host cells. We have identified a transmembrane micronemal protein MIC6, which functions as an escorter for the accurate targeting of two soluble proteins MIC1 and MIC4 to the micronemes. Disruption of MIC1, MIC4, and MIC6 genes allowed us to precisely dissect their contribution in sorting processes. We have mapped domains on these proteins that determine complex formation and targeting to the organelle. MIC6 carries a sorting signal(s) in its cytoplasmic tail whereas its association with MIC1 involves a lumenal EGF-like domain. MIC4 binds directly to MIC1 and behaves as a passive cargo molecule. In contrast, MIC1 is linked to a quality control system and is absolutely required for the complex to leave the early compartments of the secretory pathway. MIC1 and MIC4 bind to host cells, and the existence of such a complex provides a plausible mechanism explaining how soluble adhesins act. We hypothesize that during invasion, MIC6 along with adhesins establishes a bridge between the host cell and the parasite.


Assuntos
Moléculas de Adesão Celular/metabolismo , Estrutura Terciária de Proteína , Proteínas de Protozoários/metabolismo , Toxoplasma/metabolismo , Toxoplasmose/fisiopatologia , Animais , Moléculas de Adesão Celular/genética , Linhagem Celular , Chlorocebus aethiops , Retículo Endoplasmático/metabolismo , Fibroblastos , Marcação de Genes , Complexo de Golgi/metabolismo , Humanos , Immunoblotting , Microscopia de Fluorescência , Sinais Direcionadores de Proteínas , Transporte Proteico , Proteínas de Protozoários/genética , Proteínas Recombinantes/metabolismo , Toxoplasma/genética , Toxoplasma/patogenicidade , Toxoplasma/ultraestrutura , Transfecção , Células Vero
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...