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Metabolic Glycoengineering of Sialic Acid Using N-acyl-modified Mannosamines
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Tunable multivalent Fe(II)-based glycoassemblies as mimetics for native high-mannose glycans
Emerson Hall1, Yu-Shien Sung2, Chad W Priest2
1Department of Biochemistry and Molecular Biophysics, University of California San Diego, La Jolla CA.
bioRxiv : the preprint server for biology
|December 25, 2025
Resumen
Chemically defined multivalent glycan displays mimic high mannose glycans (HMGs) and inhibit lectin binding. These Fe(II) iminopyridine complexes offer tunable interactions for biological applications.
Área de la Ciencia:
- Química de Carbohidratos
- Química Biofísica
- Glicobiología
Sus antecedentes:
- Los glicanos de alta cantidad de manosa (HMG) son cruciales en procesos biológicos como el plegamiento de proteínas y la inmunidad.
- Las lectinas se unen a los HMG a través de interacciones multivalentes, que involucran múltiples azúcares y sitios de unión de lectinas.
Objetivo del estudio:
- Crear pantallas de glicanos multivalentes químicamente definidas utilizando complejos de iminopiridina Fe(II).
- Investigar la interacción de estas pantallas con Griffithsin monomérica (mGRFT) como lectina modelo.
- Explorar su potencial como miméticos de HMG e inhibidores competitivos.
Principales métodos:
- Síntesis de complejos de iminopiridina Fe(II) con valencia de glicano controlada, longitud del brazo y visualización de manosa.
- Caracterización de interacciones utilizando interferometría de biolayer (BLI), calorimetría de titulación isotérmica (ITC) y espectroscopía de RMN.
- Modificaciones moleculares sistemáticas para ajustar la afinidad de unión.
Principales resultados:
- Los ensamblajes de glicanos Fe(II) exhibieron un rango de afinidad de unión (KD) de >1000 veces con mGRFT.
- La afinidad de unión fue ajustable alterando la longitud de la cadena del sacárido y el número de azúcares mostrados.
- Demostró la capacidad de estos ensamblajes para imitar los HMG nativos.
Conclusiones:
- Los ensamblajes de glicanos Fe(II) sintonizables sirven como miméticos efectivos para los glicanos de alta cantidad de manosa.
- Estos ensamblajes pueden funcionar como inhibidores competitivos de la unión de glicanos nativos por lectinas.
- El estudio proporciona una plataforma para el diseño de moléculas basadas en glicanos con propiedades de unión controladas.
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