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Perspectivas estructurales y dinámicas de la interacción podocalyxina-ezrina como objetivo en la progresión del

Mila Milutinovic¹, Stuart Lutimba¹, Mohammed A Mansour^1,2

¹Cancer, Infection and Therapeutics Laboratory, School of Allied Health and Life Sciences, College of Health and Life Sciences, London South Bank University, 103 Borough Road, London SE1 0AA, UK.

Journal of xenobiotics

|February 20, 2026

Resumen

Los investigadores descubrieron cómo la proteína cancerosa podocalyxina (PODXL) interactúa con la ezrina, identificando una mutación que puede promover la diseminación del cáncer. Se encontró que un compuesto, el NSC305787, se dirige selectivamente a este complejo mutante de PODXL.

Área de la Ciencia:

Biología molecular e investigación del cáncer.
Biología estructural y biofísica computacional.

Sus antecedentes:

La metástasis del cáncer impulsa más del 90% de las muertes por cáncer, lo que hace necesario comprender sus impulsores moleculares.
La podocalyxina (PODXL) se sobreexpresa en cánceres agresivos, interactuando con la proteína de unión a actina ezrina para influir en el comportamiento celular.
La base estructural y funcional de la interacción PODXL-ezrina, crucial para la progresión del cáncer, sigue siendo poco comprendida y difícil de tratar terapéuticamente.

Objetivo del estudio:

Elucidar los mecanismos estructurales subyacentes a la interacción PODXL-ezrina.
Investigar el impacto de la mutación R495W de PODXL en la unión y activación de la ezrina.
Identificar estrategias terapéuticas potenciales dirigidas al complejo PODXL-ezrina en el cáncer.

Principales métodos:

Enfoque computacional integrado que incluye acoplamiento de proteínas y simulaciones de dinámica molecular (MD).
Se utilizaron estructuras predichas por AlphaFold para modelar complejos PODXL-ezrina.
Se realizó un cribado virtual para identificar moléculas pequeñas que interactúan con el complejo PODXL-ezrina.

Principales resultados:

El dominio citoplasmático de PODXL se estabiliza al unirse a la ezrina, y la arginina 495 juega un papel clave en el ensamblaje inicial del complejo.
La mutación R495W de PODXL desestabiliza alostéricamente la conformación inactiva de la ezrina, lo que podría prepararla para la activación y mejorar la señalización oncogénica.
Se identificó NSC305787 como un desestabilizador selectivo del complejo mutante R495W, que interrumpe interacciones críticas y dificulta la captación de PIP2.

Conclusiones:

El estudio revela cambios estructurales dependientes de mutaciones en el complejo PODXL-ezrina, ofreciendo información sobre los mecanismos de progresión del cáncer.
Los hallazgos resaltan el potencial de dirigirse a interacciones específicas de PODXL-ezrina para la terapia contra el cáncer.
Se identificó NSC305787 como un compuesto líder prometedor para el desarrollo de tratamientos para cánceres con alteraciones de PODXL.

Palabras clave:

Ezrina PODXL mutación R495W modelado biofísico metástasis del cáncer

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