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Updated: May 7, 2026
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Identification of Kinase-substrate Pairs Using High Throughput Screening
Published on: August 29, 2015
El análisis estructural y funcional de la rotamasa mitótica Pin1 sugiere que el reconocimiento del sustrato depende
R Ranganathan1, K P Lu, T Hunter
1Structural Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA.
Cell
|June 13, 1997
Resumen
Pin1, un regulador del ciclo celular, fue estudiado utilizando cristalografía de rayos X. Su estructura revela un mecanismo catalítico que involucra la catálisis ácido-base y covalente para la isomerización del enlace peptídico, crucial para la división celular.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
Sus antecedentes:
- Pin1 (peptidyl-prolyl cis-trans isomerasa) es un regulador clave del ciclo celular, en particular la transición G2 / M.
- Su papel en la mitosis pone de relieve su importancia en la división celular eucariota.
Objetivo del estudio:
- Para dilucidar las propiedades estructurales y funcionales del Pin1 humano1.
- Comprender el mecanismo catalítico y las preferencias de unión al sustrato de Pin1.
Principales métodos:
- Se utilizó la cristalografía de rayos X para determinar la estructura cristalina de 1,35 Å de Pin1 complejo con un dipeptido AlaPro.
- La caracterización funcional involucró estudios de titulación de pH y mutagenesis de cisteína en el sitio activo.
Principales resultados:
- La estructura cristalina reveló el complejo de Pin1 con AlaPro, proporcionando información sobre su sitio activo.
- El mecanismo catalítico involucra catálisis ácido-base general y covalente para la isomerización del enlace peptídico.
- Pin1 muestra una preferencia por los residuos ácidos N-terminales al enlace de prolina, que interactúan con un grupo básico.
Conclusiones:
- Los hallazgos sugieren un mecanismo catalítico detallado para la actividad de la isomerasa de Pin1.
- La preferencia de sustrato observada indica potencial para la regulación por fosforilación mediada de las interacciones del sustrato Pin1 en el control del ciclo celular.
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