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Author Spotlight: Evaluating Biophysical Assays for Characterizing PROTACS Ternary Complexes
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Complejo de interacciones dependientes de la conformación para un PROTAC SMARCA2 y ciclodextrina
Matthew N O'Brien Laramy1, José G Napolitano1, Yuhui Zhou2
1Synthetic Molecule Pharmaceutical Sciences, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, United States.
Molecular pharmaceutics
|December 20, 2025
Resumen
Los degradadores de proteínas, o quimeras de targeting de proteólisis (PROTACs), exhiben propiedades conformacionales únicas que influyen en su solubilidad. Comprender estas conformaciones de PROTAC es clave para una formulación y desarrollo de fármacos eficaces.
Área de la Ciencia:
- Bioquímica
- Química Medicinal
- Ciencias Farmacéuticas
Sus antecedentes:
- Los degradadores de proteínas bivalesentes, conocidos como quimeras de targeting de proteólisis (PROTACs), representan un enfoque terapéutico novedoso.
- Los PROTACs poseen características fisicoquímicas y estructurales únicas que pueden dificultar las propiedades biofarmacéuticas como la solubilidad, complicando el desarrollo de fármacos.
- Existe una investigación limitada sobre estrategias de formulación específicamente diseñadas para PROTACs para abordar estos desafíos.
Objetivo del estudio:
- Investigar los mecanismos de solubilización de un PROTAC basado en VHL (A515) dirigido a SMARCA2.
- Elucidar el papel de la conformación molecular y la estereoquímica en la solubilidad y formulación de PROTAC.
Principales métodos:
- Se utilizaron técnicas de espectroscopía de Resonancia Magnética Nuclear (RMN).
- Se empleó calorimetría de titulación isotérmica (ITC).
- Se realizaron mediciones cuantitativas de solubilidad.
Principales resultados:
- A515 existe en dos poblaciones conformacionales distintas en solución acuosa, que difieren en la rotación del grupo amida (isómeros de prolina trans y prolina cis).
- El isómero de prolina trans adopta conformaciones abiertas con un tamaño hidrodinámico mayor, mientras que el isómero de prolina cis forma conformaciones condensadas con un tamaño hidrodinámico menor.
- La eficiencia de solubilización de la 2-hidroxipropil-β-ciclodextrina (HP-β-CD) varía entre estas poblaciones, influenciada por la accesibilidad de las regiones terminales de A515.
Conclusiones:
- La conformación y la estereoquímica juegan un papel crítico, previamente no reportado, en el diseño racional de formulaciones de PROTACs.
- Las poblaciones conformacionales distintas de los PROTACs exhiben respuestas diferenciales a excipientes solubilizantes como HP-β-CD.
- Estos hallazgos proporcionan consideraciones específicas para la formulación de PROTACs basados en VHL para mejorar la solubilidad.
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