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El N-óxido de trimetilamina estabiliza la estructura terciaria del ARN y atenúa los efectos desnaturalizantes de la
Thomas C Gluick1, Sushma Yadav
1Department of Chemistry and Biochemistry, P.O. Box 19065, The University of Texas at Arlington, Arlington, TX 76019, USA. tcgluick@uta.edu
Journal of the American Chemical Society
|April 10, 2003
Resumen
El N-óxido de trimetilamina (TMAO) estabiliza las estructuras terciarias del ARN, contrarrestando la urea.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- Biología Estructural Biología estructural.
Sus antecedentes:
- Los osmolitos como el N-óxido de trimetilamina (TMAO) y la urea ayudan a las células a sobrevivir en condiciones extremas.
- El TMAO y la urea se encuentran en tiburones y rayas en una proporción molar de 1:2, donde el TMAO contrarresta los efectos desestabilizadores de proteínas de la urea.
- Se sabe que el ARN se desnaturaliza por la urea.
Objetivo del estudio:
- Investigar si el TMAO estabiliza las estructuras terciarias del ARN de manera similar a las proteínas.
- Para determinar si el TMAO contrarresta los efectos desnaturalizantes de la urea en el ARN.
Principales métodos:
- Estudió el efecto del TMAO y la urea en la estructura terciaria de Escherichia coli tRNAfmet.
- Estabilidad estructural examinada en diferentes proporciones molares de TMAO a urea.
Principales resultados:
- Se encontró que el TMAO estabilizaba la estructura terciaria de Escherichia coli tRNAfmet.
- El TMAO contrarrestó eficazmente los efectos desnaturalizantes de la urea en el ARN en las mismas proporciones observadas para las proteínas.
- La estabilidad de la estructura terciaria del ARN está influenciada por la composición del disolvente, no solo por la unión catiónica.
Conclusiones:
- El TMAO estabiliza las estructuras terciarias del ARN y mitiga el impacto desnaturalizante de la urea.
- Las propiedades del disolvente juegan un papel crucial en la estabilidad de la estructura terciaria del ARN.
- Las interacciones desfavorables de la columna vertebral TMAO-fosfodiéster pueden impulsar el plegamiento del ARN.
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