Abstract
αB-Crystallin is a small heat shock protein associated with numerous degenerative diseases and abnormal growth patterns. The development of protein–nanoparticle conjugates is a motivation to investigate αB-crystallin domain (ACD) as a part of treatment regime. Molecular docking simulations were applied to localize the potential interaction sites of chitosan (CS). These studies revealed that chitosan forms H-bonds with K92A, E99A, E117A, and E117B amino acid residues of ACD. Molecular dynamics simulations with explicit water molecules of both the native ACD of the protein and a ligand–protein complex showed that the potential energy of ACD-CS complex is lesser than the native ACD. The structure of the ACD-CS complex showed low root mean square deviation (RMSD) with respect to its reference positioning. The flexibility of ACD-CS complex as indicated by a root-mean-square fluctuation analysis indicated similarities overall, with some residue specific differences for G27, E42, T64, and P80 that are situated prior to a flexible loops. The flexibility of these residues was notably larger in the protein–ligand complex form. In addition, the number of hydrogen bonds is constant throughout the 2-ns simulation. Analyses of MD trajectories for native ACD and ACD-CS complex revealed subtle structure variation between the subunits of the dimer. However, the secondary structures of both models remain close to their starting structures. The potential utilization of αB-crystallin domain/chitosan complex as a therapeutic agent for crystallinopathy is paramount.
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I thank Professor Case DA for providing me the Amber8 package.
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Gawad, A.ED.A., Ibrahim, M. Computational Studies of the Interaction of Chitosan Nanoparticles and αB-Crystallin. BioNanoSci. 3, 302–311 (2013). https://doi.org/10.1007/s12668-013-0096-3
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DOI: https://doi.org/10.1007/s12668-013-0096-3