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Empalme condicional de proteínas: una nueva herramienta para controlar la estructura y la función de las proteínas in
Henning D Mootz1, Elyse S Blum, Amy B Tyszkiewicz
1Laboratory of Synthetic Protein Chemistry, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.
Journal of the American Chemical Society
|August 28, 2003
Resumen
Los investigadores desarrollaron un sistema de empalme condicional de proteínas (CPS) utilizando una inteína dividida activada por la rapamicina. Este sistema permite la ligación controlada de proteínas en células de mamíferos con respuestas rápidas y dependientes de la dosis, ofreciendo una nueva herramienta para la ingeniería de proteínas.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- Biología sintética Biología sintética.
Sus antecedentes:
- El empalme de proteínas es un proceso natural en el que las inteínas se excisan a sí mismas, uniéndose a las exteínas que las flanquean.
- Las inteínas divididas por ingeniería ofrecen una ligadura controlada de las proteínas.
- La rapamicina puede desencadenar el empalme en las proteínas VMA divididas por ingeniería.
Objetivo del estudio:
- Para demostrar la utilidad de un sistema de empalme condicional de proteínas (CPS) en células de mamíferos.
- Para investigar la cinética y el control del empalme de proteínas inducido por rapamicina.
- Explorar la flexibilidad y las aplicaciones de CPS en proteómica.
Principales métodos:
- Transfección transitoria de células de mamíferos con construcciones que codifican mitades inteínas divididas fusionadas con proteínas reporteras (MBP y His-tag).
- Inducción de empalme de proteínas utilizando rapamicina o sus análogos.
- Detección de productos de proteínas empalmadas a través del Western blotting y la inmunoprecipitación.
- Dosis-respuesta y estudios de inhibición competitiva con el uso de ascomicina.
- Investigación de la flexibilidad geométrica utilizando proteínas purificadas con dominios FKBP/FRB.
Principales resultados:
- El empalme condicional de proteínas (CPS) se demostró con éxito en células de mamíferos.
- El empalme fue dependiente de la rapamicina, rápido (dentro de 10 minutos) y dependiente de la dosis.
- No se observó splicing de fondo durante un período de 24 horas sin el inductor.
- La ascomicina inhibió competitivamente el proceso de empalme.
- Los componentes CPS mostraron flexibilidad geométrica, con los dominios FKBP / FRB fusionados para eliminar las posiciones que aún permiten el empalme desencadenado por rapamicina.
Conclusiones:
- El sistema CPS es una herramienta viable para la ligadura controlada de proteínas en células de mamíferos.
- El sistema ofrece un control rápido y sintonizable de la estructura y función de las proteínas.
- CPS tiene amplias aplicaciones potenciales en proteómica y biotecnología.
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