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Las estructuras cristallográficas de dos complejos de bifosfonato:1-deoxisilulosa-5-fosfato reductoisomerasa
Shunsuke Yajima1, Kodai Hara, John M Sanders
1Department of Bioscience, Tokyo University of Agriculture, Setagaya-ku, Tokyo 156-8502, Japan.
Journal of the American Chemical Society
|September 2, 2004
Resumen
Dos bifosfonatos fueron cristalizados con 1-deoxyxylulose-5-phosphate reductoisomerase (DXR), revelando las interacciones de unión. Estas estructuras ofrecen potencial para el desarrollo de nuevos inhibidores de la DXR de bisfosfonato como agentes anti-infecciosos.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Estructural Biología estructural.
- Descubrimiento de Drogas Descubrimiento de Drogas
Sus antecedentes:
- 1-deoxyxylulose-5-phosphate reductoisomerase (DXR) es una enzima crucial y un objetivo validado para el desarrollo de fármacos antipalúdicos.
- Los bisfosfonatos son una clase de compuestos con potenciales aplicaciones terapéuticas.
- Comprender las interacciones enzima-inhibidor es clave para el diseño racional de fármacos.
Objetivo del estudio:
- Para determinar las estructuras cristalinas de DXR unido a dos nuevos bifosfonatos.
- Para aclarar los modos de unión e interacciones de estos bifosfonatos dentro del sitio activo de la DXR.
- Explorar el potencial de los bifosfonatos como inhibidores de la DXR para terapias anti-infecciosas.
Principales métodos:
- Se empleó cristalografía de rayos X monocristalino para obtener estructuras de alta resolución.
- Se analizaron datos cristalográficos para identificar las interacciones ligando-proteína.
- Nomenclatura de las enzimas: 1-deoxicilulosa-5-fosfato reductoisomerasa (DXR, CE 1.1.1.267).
Principales resultados:
- Se obtuvieron con éxito las estructuras cristalinas de DXR complejo con [(1-isoquinolinylamino) metileno]-1,1-bisfosfonato y [[(5-chloro-2-pyridinyl) amino] metileno]-1,1-bisfosfonato.
- Ambos bifosfonatos se unen al sitio de unión de la fosmidomicina de DXR.
- Se observaron interacciones detalladas: grupos aromáticos en un bolsillo hidrofóbico, grupos de fosfonatos que forman interacciones electrostáticas con Mg2+ o residuos de aminoácidos, y sulfato que ocupa el sitio de unión del fosmidomicina-fosfonato.
Conclusiones:
- Las estructuras cristalinas determinadas proporcionan información valiosa sobre la unión de los bifosfonatos a DXR.
- Estos hallazgos apoyan el desarrollo posterior de los bisfosfonatos y compuestos relacionados como potentes inhibidores de la DXR.
- El estudio destaca el potencial de los inhibidores de la DXR basados en bifosfonatos como nuevos agentes antiinfecciosos.
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