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dc.contributor.author | Kuroi, Kunisato | en |
dc.contributor.author | Okajima, Koji | en |
dc.contributor.author | Ikeuchi, Masahiko | en |
dc.contributor.author | Tokutomi, Satoru | en |
dc.contributor.author | Terazima, Masahide | en |
dc.contributor.alternative | 黒井, 邦巧 | ja |
dc.contributor.alternative | 岡島, 公司 | ja |
dc.contributor.alternative | 池内, 昌彦 | ja |
dc.contributor.alternative | 徳富, 哲 | ja |
dc.contributor.alternative | 寺嶋, 正秀 | ja |
dc.date.accessioned | 2014-10-06T00:36:44Z | - |
dc.date.available | 2014-10-06T00:36:44Z | - |
dc.date.issued | 2014-09-29 | - |
dc.identifier.issn | 0027-8424 | - |
dc.identifier.uri | http://hdl.handle.net/2433/190474 | - |
dc.description | 生体タンパク質反応の鍵となる「揺らぎ」検出に成功 -新規薬剤探索の新指針に期待-. 京都大学プレスリリース. 2014-10-03. | ja |
dc.description.abstract | Knowledge of the dynamical behavior of proteins, and in particular their conformational fluctuations, is essential to understanding the mechanisms underlying their reactions. Here, transient enhancement of the isothermal partial molar compressibility, which is directly related to the conformational fluctuation, during a chemical reaction of a blue light sensor protein from the thermophilic cyanobacterium Thermosynechococcus elongatus BP-1 (TePixD, Tll0078) was investigated in a time-resolved manner. The UV-Vis absorption spectrum of TePixD did not change with the application of high pressure. Conversely, the transient grating signal intensities representing the volume change depended significantly on the pressure. This result implies that the compressibility changes during the reaction. From the pressure dependence of the amplitude, the compressibility change of two short-lived intermediate (I1 and I2) states were determined to be +(5.6 ± 0.6) × 10(-2) cm(3)⋅mol(-1)⋅MPa(-1) for I1 and +(6.6 ± 0.7)×10(-2) cm(3)⋅mol(-1)⋅MPa(-1) for I2. This result showed that the structural fluctuation of intermediates was enhanced during the reaction. To clarify the relationship between the fluctuation and the reaction, the compressibility of multiply excited TePixD was investigated. The isothermal compressibility of I1 and I2 intermediates of TePixD showed a monotonic decrease with increasing excitation laser power, and this tendency correlated with the reactivity of the protein. This result indicates that the TePixD decamer cannot react when its structural fluctuation is small. We concluded that the enhanced compressibility is an important factor for triggering the reaction of TePixD. To our knowledge, this is the first report showing enhanced fluctuations of intermediate species during a protein reaction, supporting the importance of fluctuations. | en |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | National Academy of Sciences | en |
dc.rights | © 2014 National Academy of Sciences. | en |
dc.rights | この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 | ja |
dc.rights | This is not the published version. Please cite only the published version. | en |
dc.title | Transient conformational fluctuation of TePixD during a reaction. | en |
dc.type | journal article | - |
dc.type.niitype | Journal Article | - |
dc.identifier.ncid | AA00786025 | - |
dc.identifier.jtitle | Proceedings of the National Academy of Sciences of the United States of America | en |
dc.identifier.volume | 111 | - |
dc.identifier.issue | 41 | - |
dc.identifier.spage | 14764 | - |
dc.identifier.epage | 14769 | - |
dc.relation.doi | 10.1073/pnas.1413222111 | - |
dc.textversion | author | - |
dc.identifier.pmid | 25267654 | - |
dc.relation.url | https://www.kyoto-u.ac.jp/ja/research-news/2014-10-03 | - |
dcterms.accessRights | open access | - |
出現コレクション: | 学術雑誌掲載論文等 |
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