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Forced Unfolding Mechanism of Bacteriorhodopsin as Revealed by Coarse-Grained Molecular Dynamics
http://hdl.handle.net/2237/25575
http://hdl.handle.net/2237/2557520e5b812-21df-4988-b8fb-762d5a2d8f73
名前 / ファイル | ライセンス | アクション |
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25802_3_merged_1475679896.pdf ファイル公開:2017/11/01 (10.2 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2017-02-15 | |||||
タイトル | ||||||
タイトル | Forced Unfolding Mechanism of Bacteriorhodopsin as Revealed by Coarse-Grained Molecular Dynamics | |||||
言語 | en | |||||
著者 |
Yamada, Tatsuya
× Yamada, Tatsuya× Yamato, Takahisa× Mitaku, Shigeki |
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アクセス権 | ||||||
アクセス権 | open access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
権利 | ||||||
言語 | en | |||||
権利情報 | © 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | |||||
抄録 | ||||||
内容記述 | Developments in atomic force microscopy have opened up a new path toward single-molecular phenomena; in particular, during the process of pulling a membrane protein out of a lipid bilayer. However, the characteristic features of the force-distance (F-D) curve of a bacteriorhodopsin in purple membrane, for instance, have not yet been fully elucidated in terms of physicochemical principles. To address the issue, we performed a computer simulation of bacteriorhodopsin with, to our knowledge, a novel coarse-grained (C-G) model. Peptide planes are represented as rigid spheres, while the surrounding environment consisting of water solvents and lipid bilayers is represented as an implicit continuum. Force-field parameters were determined on the basis of auxiliary simulations and experimental values of transfer free energy of each amino acid from water to membrane. According to Popot’s two-stage model, we separated molecular interactions involving membrane proteins into two parts: I) affinity of each amino acid to the membrane and intrahelical hydrogen bonding between main chain peptide bonds; and II) interhelix interactions. Then, only part I was incorporated into the C-G model because we assumed that the part plays a dominant role in the forced unfolding process. As a result, the C-G simulation has successfully reproduced the key features, including peak positions, of the experimental F-D curves in the literature, indicating that the peak positions are essentially determined by the residue-lipid and intrahelix interactions. Furthermore, we investigated the relationships between the energy barrier formation on the forced unfolding pathways and the force peaks of the F-D curves. | |||||
言語 | en | |||||
内容記述タイプ | Abstract | |||||
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言語 | en | |||||
出版者 | Elsevier | |||||
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言語 | eng | |||||
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資源タイプresource | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
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出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1016/j.bpj.2016.09.051 | |||||
ISSN | ||||||
収録物識別子タイプ | PISSN | |||||
収録物識別子 | 0006-3495 | |||||
書誌情報 |
en : Biophysical Journal 巻 111, 号 10, p. 2086-2098, 発行日 2016-11 |
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著者版フラグ | ||||||
値 | author | |||||
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識別子 | http://dx.doi.org/10.1016/j.bpj.2016.09.051 | |||||
識別子タイプ | DOI | |||||
URI | ||||||
識別子 | http://hdl.handle.net/2237/25575 | |||||
識別子タイプ | HDL |