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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Thermodynamic and structural aspects of molecular recognition in mannose-binding protein complexes: a theoretical study over HRP-ArtinM association

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Author(s):
Santo, Anderson Aparecido do Espirito [1] ; Feliciano, Gustavo Troiano [1]
Total Authors: 2
Affiliation:
[1] Sao Paulo State Univ, Inst Chem, Araraquara, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Molecular Modeling; v. 27, n. 4 MAR 15 2021.
Web of Science Citations: 0
Abstract

The biomolecular recognition of D-mannose-binding lectin from Artocarpus heterophyllus (ArtinM) by Horseradish Peroxidase (HRP) mediated by glycosylation allows their application in a multitude of biological systems. The present work describes the use of molecular dynamics (MD) to assess the Gibbs free energy associated with the formation of a ArtinM-HRP conjugate mediated by a glycosylation molecule. For the enthalpy term, we applied the molecular mechanics Poisson-Boltzmann surface area (MM-PBSA) method and for the vibrational entropy term, we use the quasi-harmonic approximation. Our results show that, even without glycosylation, the binding free energy between ArtinM and HRP is - 196.154 kJmol(- 1), an extremely high affinity with low selectivity, originated mainly through the van der Waals energy terms. The binding free energy between ArtinM and the glycosylated HRP (gHRP) was calculated at - 66.156 kJmol(- 1), an absolute and considerably lower value, however, originated from electrostatic energy terms, which increases the selectivity of molecular recognition. Our work has shown that the HRP active site region has a high affinity and low selectivity for other biomolecules. The presence of glycosylation plays a role in increasing this selectivity for this region. Thus, we conclude that performing mutagenesis of amino acid residues near the entrance of the catalytic site, can improve the activity of non-glycosylated HRPs. This illustrates new insights that can be applied to carbohydrate-based immunochemistry. (AU)

FAPESP's process: 17/24839-0 - Nanoelectronics and nanoscale electrochemistry: fundaments and applications
Grantee:Paulo Roberto Bueno
Support Opportunities: Research Projects - Thematic Grants