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La estabilidad relativa de las hélices determina el paisaje plegable de los aptameros de riboswitch de adenina
1Department of Chemistry and Biochemistry and Biophysics Program, Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA.
Journal of the American Chemical Society
|October 3, 2008
Resumen
Este estudio cuantifica el panorama energético del aptamer de riboswitch de adición utilizando fuerza mecánica y simulaciones. La unión a la adenina estabiliza la estructura del aptamer, lo que afecta a los mecanismos de regulación de los genes.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- La biofísica es la biofísica.
- Biología computacional Biología computacional.
Sus antecedentes:
- Los riboswitches son moléculas de ARN que regulan la expresión génica mediante la detección de metabolitos.
- El plegamiento del dominio aptamer influye en la plataforma de expresión aguas abajo, controlando la salida de genes.
- Comprender el plegamiento del riboswitch es crucial para descifrar la regulación génica.
Objetivo del estudio:
- Para caracterizar cuantitativamente el panorama energético del aptamer. añadir riboswitch.
- Investigar el papel de la unión de la adenina en el plegamiento y la estabilidad del aptamer.
- Para dilucidar la interacción entre el plegamiento del aptamer y el control de la expresión génica aguas abajo.
Principales métodos:
- Experimentos de desdoblamiento y replegamiento de la fuerza mecánica.
- Simulaciones de modelos de polímero autoorganizado de grano grueso.
- Simulaciones de la dinámica browniana.
Principales resultados:
- Se identificaron múltiples estados de plegamiento durante el plegamiento del aptamer, con y sin adenina.
- La unión a la adenina estabiliza significativamente la estructura plegada del aptamero.
- La unión a la adenina disminuye la velocidad de despliegue del aptamer, lo que influye en la regulación génica.
Conclusiones:
- Los moduladores de unión a la adenina añaden estabilidad al aptamer del riboswitch y dinámica de plegado.
- El plegamiento del aptamer compite con la formación del bucle del tallo aguas abajo en el riboswitch.
- Estos hallazgos ofrecen información sobre los mecanismos moleculares de la regulación génica basada en ARN.
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