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Perspectivas atómicas sobre los efectos anómero y estereoquímicos en el transporte de glucosa por GLUTs

Brian Wiley¹, Leonardo Cirqueira¹, Richard J Naftalin²

¹Department of Chemistry, University of Bath, 1 South Building, Claverton Down, Bath BA2 7AX, United Kingdom.

Journal of the American Chemical Society

|February 2, 2026

Resumen

Los transportadores de glucosa GLUT1 y GLUT3 muestran preferencias específicas del anómero, con interacciones distintas que favorecen a la α-glucosa externamente y a la β-glucosa internamente. Esto revela una estereoselectividad compleja más allá del sitio de unión primaria.

Área de la Ciencia:

La bioquímica es la bioquímica.
Biología Estructural Biología estructural.
La biofísica molecular es la biofísica molecular.

Sus antecedentes:

Los transportadores de glucosa (GLUT) median la absorción de glucosa, que es crucial para la energía celular.
GLUT1 y GLUT3 exhiben diferentes cinéticas de transporte, lo que sugiere preferencias anómeras.
Comprender estas preferencias es clave para la regulación metabólica y la enfermedad.

Objetivo del estudio:

Investigar las preferencias anómeras de GLUT1 y GLUT3 para la α- y β-glucosa.
Proporcionar conocimientos mecanicistas sobre las tasas de transporte y la vinculación específicas del anómero.
Para aclarar la base estructural de la estereoselectividad en el transporte de glucosa.

Principales métodos:

Simulaciones de dinámica molecular clásica (DM). simulaciones.
Análisis de las frecuencias de enlace de hidrógeno entre las anomalías de glucosa y los residuos transportadores.
Análisis de la fluctuación de la raíz media cuadrada (RMSF) durante las simulaciones de inundaciones.

Principales resultados:

GLUT3 muestra una interacción preferente con la α-d-glucosa en los residuos extracelulares.
Los residuos de GLUT3 orientados hacia el interior muestran un sesgo hacia la β-d-glucosa.
La estereoselectividad anomérica involucra residuos extramembranosos, no sólo el sitio de unión central.

Conclusiones:

GLUT1 y GLUT3 poseen una estereoselectividad anómica compleja y distribuida.
Las interacciones con los residuos extramembranosos contribuyen significativamente al transporte selectivo de glucosa.
Las interacciones alostéricas pueden influir en el comportamiento cooperativo del transporte.

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