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Control de la actividad del factor de transcripción y la diferenciación de los osteoblastos en las células de
Courtney M Yuen1, Stephen J Rodda, Steven A Vokes
1Department of Chemistry and Chemical Biology, Howard Hughes Medical Institute, Harvard University, Cambridge, Massachusetts 02138, USA.
Journal of the American Chemical Society
|July 6, 2006
Resumen
Las inteínas diseñadas permiten un control preciso de la actividad de las proteínas en las células de mamíferos utilizando 4-hidroxitamoxifeno (4-HT). Este sistema permite una regulación post-traducional específica del gen inducida por pequeñas moléculas y dependiente de la dosis.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología sintética Biología sintética.
- La bioquímica es la bioquímica.
Sus antecedentes:
- Las enteínas son elementos proteicos que catalizan el empalme, excisándose y uniéndose a las enteínas flanqueantes.
- Trabajos anteriores desarrollaron interruptores basados en inteína dependientes del 4-hidroxitamoxifeno (4-HT) en levaduras.
- El control de la actividad de las proteínas con moléculas externas es crucial para la investigación biológica y la terapéutica.
Objetivo del estudio:
- Para demostrar la eficacia de las inteínas evolucionadas para el empalme de proteínas dependientes de 4-HT en células de mamíferos.
- Para caracterizar la cinética y la dependencia de la dosis de este sistema en diferentes tipos de células.
- Aplicar este sistema para controlar la función de los genes y los procesos biológicos complejos.
Principales métodos:
- Evolución dirigida de enteros para la dependencia 4-HT.
- Caracterización del empalme de proteínas inducido por ligandos en las células NIH3T3 y HEK293.
- Aplicación de inteínas evolucionadas para controlar los mediadores de la vía del erizo (Gli1, Gli3) y la diferenciación de los osteoblastos.
Principales resultados:
- Las inteínas evolucionadas mediaron efectivamente el empalme de proteínas dependientes de 4-HT en células de mamíferos.
- El sistema demostró generalidad, velocidad y control dependiente de la dosis.
- El control funcional de la diferenciación de Gli1, Gli3 y osteoblastos se logró utilizando el sistema de inteína inducible por 4-HT.
Conclusiones:
- Las inteínas evolucionadas dependientes de pequeñas moléculas ofrecen una plataforma versátil para el control preciso y post-traducional de la actividad de las proteínas en los sistemas de mamíferos.
- Esta tecnología permite la manipulación genespecífica, dependiente de la dosis y regulada externamente de las vías y procesos biológicos.
- El sistema tiene potencial para aplicaciones en terapia génica, descubrimiento de fármacos e investigación biológica fundamental.
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