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Published on: July 19, 2024
Structural basis for ligand recognition in a mushroom lectin: solvent structure as specificity predictor.
Diego F Gauto1, Santiago Di Lella, Darío A Estrin
1Departamento de Química Inorgánica, Analítica, y Química Física, INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, C1428EHA Ciudad de Buenos Aires, Argentina, Argentina.
The Agaricus bisporus lectin (ABL) has two carbohydrate recognition domains (CRDs) that selectively bind different sugars. Molecular dynamics simulations reveal how these CRDs recognize specific monosaccharides, aiding in the design of targeted therapies.
Area of Science:
- Glycobiology
- Structural Biology
- Biochemistry
Background:
- Lectins recognize specific carbohydrates via carbohydrate recognition domains (CRDs).
- The mushroom lectin Agaricus bisporus (ABL) recognizes the TF-antigen (Galβ1-3GalNAc), found in neoplastic tissues.
- ABL monomers possess two CRDs, each binding different monosaccharides like N-acetyl-d-galactosamine (GalNAc) and N-acetyl-d-glucosamine (GlcNAc).
Purpose of the Study:
- To understand the molecular basis of ABL's selective monosaccharide recognition by its CRDs.
- To investigate the unusual epimeric specificity of ABL CRDs.
- To inform the design of selective lectin inhibitors for therapeutic applications.
Main Methods:
- Molecular dynamics (MD) simulations of ABL-monosaccharide complexes.
- Simulations included natural (crystallographic) and inverted (epimeric) complexes.
- Analysis of CRD local solvent structure and its relation to recognition.
Main Results:
- Detailed insights into the specific ligand recognition properties of each ABL CRD.
- Elucidation of how ABL CRDs discriminate between monosaccharides differing in single hydroxyl configurations.
- Correlation between CRD local solvent structure and the carbohydrate recognition mechanism.
Conclusions:
- Provides a detailed understanding of ABL CRD specificity.
- Enhances knowledge of selective carbohydrate recognition mechanisms in lectins.
- Offers a basis for designing more effective and selective lectin-based therapeutics.
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