Carbohydrate-receptor interactions are an integral part of biological events. They play an important role in many cellular processes, such as cell-cell adhesion, cell differentiation and in-cell signaling. Carbohydrates can interact with a receptor by using several types of intermolecular interactions. One of the most important is the interaction of a carbohydrate's apolar part with aromatic amino acid residues, known as dispersion interaction or CH/π interaction. In the study presented here, we attempted for the first time to quantify how the CH/π interaction contributes to a more general carbohydrate-protein interaction. We used a combined experimental approach, creating single and double point mutants with high level computational methods, and applied both to Ralstonia solanacearum (RSL) lectin complexes with α-L-Me-fucoside. Experimentally measured binding affinities were compared with computed carbohydrate-aromatic amino acid residue interaction energies. Experimental binding affinities for the RSL wild type, phenylalanine and alanine mutants were -8.5, -7.1 and -4.1 kcal x mol(-1), respectively. These affinities agree with the computed dispersion interaction energy between carbohydrate and aromatic amino acid residues for RSL wild type and phenylalanine, with values -8.8, -7.9 kcal x mol(-1), excluding the alanine mutant where the interaction energy was -0.9 kcal x mol(-1). Molecular dynamics simulations show that discrepancy can be caused by creation of a new hydrogen bond between the α-L-Me-fucoside and RSL. Observed results suggest that in this and similar cases the carbohydrate-receptor interaction can be driven mainly by a dispersion interaction.

• MeSH
• aminokyseliny aromatické chemie   genetika   metabolismus   MeSH
• bakteriální proteiny chemie   genetika   metabolismus   MeSH
• fukosa chemie   metabolismus   MeSH
• konformace proteinů MeSH
• konformace sacharidů MeSH
• krystalografie rentgenová MeSH
• lektiny chemie   genetika   metabolismus   MeSH
• molekulární modely * MeSH
• mutace MeSH
• proteiny chemie   genetika   metabolismus   MeSH
• Ralstonia solanacearum genetika   metabolismus   MeSH
• sacharidy chemie   MeSH
• sekundární struktura proteinů MeSH
• terciární struktura proteinů MeSH
• termodynamika MeSH
• vazba proteinů MeSH
• vazebná místa MeSH
• vodíková vazba MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• aminokyseliny aromatické MeSH
• bakteriální proteiny MeSH
• fukosa MeSH
• lektiny MeSH
• proteiny MeSH
• sacharidy MeSH