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La telomestatina y la deselenosafirina se unen selectivamente a dos formas diferentes de la estructura telomérica
Evonne M Rezler1, Jeyaprakashnarayanan Seenisamy, Sridevi Bashyam
1College of Pharmacy, The University of Arizona, 1703 East Mabel, Tucson, Arizona 85721, USA.
Journal of the American Chemical Society
|June 30, 2005
Resumen
Los ligandos como la telomestatina y Se2SAP pueden alterar las estructuras teloméricas G-cuadruplexas humanas. Diferentes ligandos inducen distintas conformaciones, impactando los resultados biológicos más allá de la simple estabilización.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- Biología Estructural Biología Estructural
Sus antecedentes:
- La secuencia telomérica humana d[T{2}AG{3}]{4} puede formar varias estructuras G-cuadruplexas.
- Estas estructuras son sensibles a las condiciones iónicas, con el sodio (Na(+)) favoreciendo un G-cuadruplex tipo canasta.
Objetivo del estudio:
- Investigar cómo los ligandos de unión a G-cuadruplex influyen en la conformación de las estructuras teloméricas G-cuadruplex en solución.
- Para caracterizar la estequiometría de unión y las preferencias estructurales de telomestatina y Se2SAP.
Principales métodos:
- Espectroscopia de dicroísmo circular (CD) para analizar cambios estructurales.
- Resonancia plasmónica de superficie biosensor (SPR) para determinar la cinética de unión y la estequiometría.
- Prueba de parada de la polimerasa para evaluar el impacto funcional.
Principales resultados:
- La telomestatina se une preferentemente al G-cuadruplex de tipo canasta con estequiometría 2:1.
- Se2SAP se une a un híbrido G-cuadruplex (características paralelas/antiparalelas) con estequiometría 1:1 en potasio (K(+)).
- La telomestatina puede inducir la formación de G-cuadruplex de tipo canasta incluso sin cationes, mientras que Se2SAP convierte las estructuras de canasta existentes en formas híbridas en K(+).
Conclusiones:
- La presencia de ligandos dicta la estructura telomérica G-cuadruplex específica que se forma.
- Los cambios estructurales inducidos por ligandos tienen implicaciones más allá de la estabilización, afectando las funciones biológicas en los telómeros y los promotores de oncogenes.
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