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Estructura helicoidal de autoensamblaje de monofosfato de disodio 5'-guanosina en una solución neutra
1Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6. gang.wu@chem.queensu.ca
Journal of the American Chemical Society
|February 10, 2009
Resumen
El nucleótido único guanosina 5'-monofosfato (5'-GMP) se autoensambla espontáneamente en una hélice de mano derecha. Esta estructura exhibe alternancia de azucareros, imitando el ADN-Z y ofreciendo información sobre la formación de ARN prebiótico.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- Los orígenes de la vida.
Sus antecedentes:
- Los ácidos nucleicos como el ADN y el ARN son polímeros de nucleótidos unidos por enlaces fosfodiéster.
- Estas moléculas comúnmente forman estructuras helicoidales, incluyendo el B-ADN y el A-ADN/ARN de la mano derecha, y el Z-ADN de la mano izquierda.
- La formación de estructuras complejas de ácido nucleico en condiciones prebióticas sigue siendo un área de investigación activa.
Objetivo del estudio:
- Para investigar las propiedades de autoensamblaje de nucleótidos individuales.
- Explorar las características estructurales de las estructuras de nucleótidos autoensamblados.
- Para determinar si los ensamblajes simples de nucleótidos pueden informar las teorías sobre el origen del ARN.
Principales métodos:
- Experimentos de autoensamblaje espontáneo con el uso de guanosina 5 omino-monofosfato (5 omino-GMP) en solución neutral.
- Análisis estructural de las estructuras helicoidales autoensambladas formadas por 5 omino-GMP.
- Comparación de la estructura helicoidal observada con las conformaciones conocidas de ADN y ARN.
Principales resultados:
- El guano sine 5 omino-monofosfato (5 omino-GMP) forma espontáneamente una hélice derecha en solución neutral.
- La estructura helicoidal está estabilizada por enlaces de hidrógeno entre 5 moléculas omino-GMP, no enlaces covalentes de fosfodiéster.
- Las 5 hélices omino-GMP muestran alternancia de C2 omino-omino-endo y C3 omino-omino-endo, una característica previamente observada sólo en el Z-ADN zurdo.
Conclusiones:
- El autoensamblaje de un solo nucleótido, 5 omino-GMP, puede generar estructuras helicoidales complejas.
- La estructura helicoidal observada de 5 omino-GMP proporciona un modelo potencial para la formación temprana de oligómeros de ARN bajo condiciones prebióticas.
- Fenómenos similares de autoensamblaje pueden ocurrir en otros sistemas de ácido nucleico, lo que sugiere un principio general para la organización molecular.
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