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Afinidad de unión mejorada para un sustrato de ADN de i-motivo exhibido por una proteína que contiene aminoácidos
Xiaoguang Bai1, Poulami Talukder1, Sasha M Daskalova1
1Biodesign Center for BioEnergetics, and School of Molecular Sciences, Arizona State University , Tempe, Arizona 85287, United States.
Journal of the American Chemical Society
|March 7, 2017
Resumen
Los investigadores modificaron una proteína
Área de la Ciencia:
- La bioquímica
- Biología molecular
- Biología estructural
Sus antecedentes:
- El motivo de reconocimiento de ARN 1 (RRM1) de la ribonucleoproteína nuclear heterogénea LL (hnRNP LL) es crucial para la unión al ADN.
- El ADN de i-motivo BCL2 es una estructura secundaria rica en G implicada en varios procesos celulares.
- Comprender las interacciones proteína-ADN es vital para descifrar la regulación génica y los mecanismos de la enfermedad.
Objetivo del estudio:
- Investigar el impacto de la incorporación de aminoácidos nucleobásicos en el dominio RRM1 en su afinidad de unión con el ADN de i-motivo BCL2.
- Explorar el potencial de los aminoácidos nucleobásicos diseñados para modular las interacciones ADN-proteína.
Principales métodos:
- Se empleó mutagénesis dirigida al sitio para introducir aminoácidos nucleobásicos en posiciones específicas del dominio RRM1.
- Se llevaron a cabo estudios de afinidad vinculante para evaluar la interacción entre las variantes modificadas de RRM1 y el ADN i-motivo de BCL2.
- Se utilizó el modelado molecular para predecir los residuos de aminoácidos involucrados en la interacción del ADN.
Principales resultados:
- La introducción de nucleobasa de citosina en la posición 24 de RRM1 aumentó la afinidad de unión para el ADN de i-motivo, lo que sugiere una interacción de Watson-Crick con G14.
- Ciertos análogos de nucleobases (por ejemplo, el análogo 1) también aumentaron la afinidad de unión al RRM1-ADN.
- La modificación del ADN i-motif en G14 redujo la interacción RRM1-ADN y el efecto estabilizador del aminoácido nucleobasa 1.
Conclusiones:
- Los aminoácidos nucleobásicos se pueden incorporar estratégicamente a los dominios de proteínas para controlar y mejorar las interacciones ADN-proteína.
- Los aminoácidos nucleobásicos diseñados ofrecen una herramienta prometedora para desarrollar nuevos agentes de unión al ADN.
- El estudio destaca la importancia de las interacciones específicas de residuos, como las que involucran a G14, en la mediación de la unión al ADN del motivo RRM1-i.
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