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El cDNA del receptor de insulina humana: la base estructural para la señalización transmembrana activada por hormonas
Cell
|April 1, 1985
Resumen
Los investigadores clonaron el ADNc del receptor de la insulina humana, revelando su estructura y homología con los receptores del FEG. Este hallazgo avanza en la comprensión de la señalización de la insulina y las actividades relacionadas de la tirosina fosfoquinasa.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- La bioquímica es la bioquímica.
Sus antecedentes:
- El receptor de insulina juega un papel crucial en el metabolismo de la glucosa y la señalización celular.
- Comprender la estructura molecular del receptor de insulina es clave para descifrar su función.
Objetivo del estudio:
- Clonar y caracterizar el cDNA del receptor de la insulina humana.
- Para dilucidar las características estructurales y los dominios funcionales potenciales del receptor de insulina.
Principales métodos:
- clonación de ADNc de la placenta humana.
- Secuenciación de nucleótidos para predecir la secuencia de aminoácidos.
- La mancha del sur para estimar el tamaño del gen.
- Análisis bioinformático para la homología de secuencias.
Principales resultados:
- Se clonó un 5 kb de ADNc que codifica el receptor de la insulina humana.
- El precursor previsto es de 1382 aminoácidos, con distintas subunidades alfa y beta.
- La subunidad alfa contiene un dominio rico en cisteína; la subunidad beta tiene un dominio transmembrana y elementos de tirosina fosfoquinasa.
- Se observó una homología de secuencia significativa con el receptor del factor de crecimiento epidérmico (EGF) y las fosfocinasas de tirosina oncogénicas como v-ros.
- El gen del receptor de insulina abarca más de 45 kb y se encuentra en el cromosoma 19.
Conclusiones:
- El receptor de la insulina humana posee una estructura compleja con dominios homólogos a las proteínas de señalización conocidas.
- Estos hallazgos proporcionan información sobre la base molecular de la acción de la insulina y los posibles objetivos terapéuticos.
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