https://scholars.lib.ntu.edu.tw/handle/123456789/406714
標題: | Investigation of the early stages of human £^D-crystallin aggregation process | 作者: | Chang C.-K. Wang S.S.S. Lo C.-H. Hsiao H.-C. Wu J.W. |
關鍵字: | aggregation;cataract;crystallin;fibril;unfolding | 公開日期: | 2017 | 卷: | 35 | 期: | 5 | 起(迄)頁: | 1042-1054 | 來源出版物: | Journal of Biomolecular Structure and Dynamics | 摘要: | Cataract, a major cause of visual impairment worldwide, is a common disease of the eye lens related to protein aggregation. Several factors including the exposure of ultraviolet irradiation and possibly acidic condition may induce the unfolding and subsequent aggregation of the crystallin proteins leading to crystalline lens opacification. Human £^D-crystallin (H£^DC), a 173 residue monomeric protein, abundant in the nucleus of the human eye lens, has been shown to aggregate and form amyloid fibrils under acidic conditions and that this aggregation route is thought to be a potential initiation pathway for the onset of age-related nuclear cataract. However, the underlying mechanism of fibril formation remains elusive. This report is aimed at examining the structural changes and possible amyloid fibril formation pathway of H£^DC using molecular dynamics and molecular docking simulations. Our findings demonstrated that incubation of H£^DC under the acidic condition redistributes the protein surface charges and affects the protein interaction with its surrounding solvent environment. This brings about a twist motion in the overall tertiary structure that gives rise to newly formed anti-parallel £]-strands in the C-terminal flexible loop regions. The change in protein structural conformation also involves an alteration in specific salt-bridge interactions. Altogether, these findings revealed a plausible mechanism for amyloid fibril formation of H£^DC that is important to the early stages of H£^DC aggregation involved in cataractogenesis. ? 2016 Informa UK Limited, trading as Taylor & Francis Group. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/406714 | ISSN: | 07391102 | DOI: | 10.1080/07391102.2016.1170632 | SDG/關鍵字: | gamma crystallin; amino acid; amyloid; CRYGD protein, human; gamma crystallin; protein aggregate; protein binding; Article; beta sheet; conformational transition; controlled study; crystal structure; molecular docking; molecular dynamics; molecular interaction; pH measurement; protein aggregation; protein domain; protein interaction; protein tertiary structure; structure analysis; surface charge; binding site; chemistry; human; hydrogen bond; metabolism; molecular model; pH; protein conformation; protein stability; proteinosis; static electricity; structure activity relation; Amino Acids; Amyloid; Binding Sites; gamma-Crystallins; Humans; Hydrogen Bonding; Hydrogen-Ion Concentration; Models, Molecular; Molecular Docking Simulation; Molecular Dynamics Simulation; Protein Aggregates; Protein Aggregation, Pathological; Protein Binding; Protein Conformation; Protein Interaction Domains and Motifs; Protein Stability; Static Electricity; Structure-Activity Relationship |
顯示於: | 化學工程學系 |
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