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61.
Color‐Discriminating Retinal Configurations of Sensory Rhodopsin I by Photo‐Irradiation Solid‐State NMR Spectroscopy
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Hiroki Yomoda Yoshiteru Makino Yuya Tomonaga Tetsurou Hidaka Dr. Izuru Kawamura Dr. Takashi Okitsu Prof. Akimori Wada Dr. Yuki Sudo Prof. Akira Naito 《Angewandte Chemie (International ed. in English)》2014,53(27):6960-6964
SRI (sensory rhodopsin I) can discriminate multiple colors for the attractant and repellent phototaxis. Studies aimed at revealing the color‐dependent mechanism show that SRI is a challenging system not only in photobiology but also in photochemistry. During the photoreaction of SRI, an M‐intermediate (attractant) transforms into a P‐intermediate (repellent) by absorbing blue light. Consequently, SRI then cycles back to the G‐state. The photoreactions were monitored with the 13C NMR signals of [20‐13C]retnal‐SrSRI using in situ photo‐irradiation solid‐state NMR spectroscopy. The M‐intermediate was trapped at ?40 °C by illumination at 520 nm. It was transformed into the P‐intermediate by subsequent illumination at 365 nm. These results reveal that the G‐state could be directly transformed to the P‐intermediate by illumination at 365 nm. Thus, the stationary trapped M‐ and P‐intermediates are responsible for positive and negative phototaxis, respectively. 相似文献
62.
63.
Izuru Kawamura Junko Tanabe Masato Ohmine Satoru Yamaguchi Satoru Tuzi Akira Naito 《Photochemistry and photobiology》2009,85(2):624-630
Structural changes in bacteriorhodopsin (bR) in two different processes of retinal reconstitutions were investigated by observing the 13C and 15N solid‐state NMR spectra of [1‐13C]Val‐ and [15N]Pro‐labeled bR. We found that NMR signals of the BC loop were sensitive to changes in protein structure and dynamics, from wild‐type (WT) bR to bacterio‐opsin (bO), regenerated bR and E1001 bR. Regenerated bR was prepared following the addition of retinal into bO obtained from photobleached WT‐bR. E1001 bR was cultured from a retinal‐deficient strain termed E1001 following the addition of retinal to growing cells. 15N NMR signal at Pro70 in the BC loop in WT‐bR was observed at 122.4 p.p.m., whereas signals were not apparent or partly suppressed in bO and regenerated bR, respectively. Similarly, the 13C NMR signal at Val69 in the BC loop at 172.0 p.p.m. that was observed in WT‐bR was significantly decreased in both regenerated bR and bO. These results suggest that the dynamic structure of the BC loop in bO was substantially altered following the removal of retinal. As a consequence, the correct protein structure failed to be recovered via the regenerating process of retinal to bO. On the other hand, 13C and 15N NMR signals at the BC loop in E1001 bR appeared at positions identical to those of WT‐bR. The results of the current study indicate that the BC loop may not always fold correctly in the regenerated bR, which leads to different properties in the regenerated bR compared to that of WT‐bR. 相似文献
64.
Sato T Segawa K Guo H Sugawara K Souma S Takahashi T Ando Y 《Physical review letters》2010,105(13):136802
We have performed angle-resolved photoemission spectroscopy on TlBiSe?, which is a member of the ternary chalcogenides theoretically proposed as candidates for a new class of three-dimensional topological insulators. We found direct evidence for a nontrivial surface metallic state showing an "X"-shaped energy dispersion within the bulk-band gap. The present result unambiguously establishes that TlBiSe? is a strong topological insulator with a single Dirac cone at the Brillouin-zone center. The observed bulk-band gap of 0.35 eV is the largest among known topological insulators, making TlBiSe? the most promising material for studying room-temperature topological phenomena. 相似文献
65.
Yang HB Wang SC Sekharan AK Matsui H Souma S Sato T Takahashi T Takeuchi T Campuzano JC Jin R Sales BC Mandrus D Wang Z Ding H 《Physical review letters》2004,92(24):246403
The electronic structure of single crystals Na0.6CoO2, which are closely related to the superconducting Na0.3CoO2.yH(2)O (T(c) approximately 5 K), is studied by angle-resolved photoelectron spectroscopy. While the measured Fermi surface (FS) is consistent with the large FS enclosing the Gamma point from the band theory, the predicted small FS pockets near the K points are absent. In addition, the band dispersion is found to be highly renormalized, and anisotropic along the two principal axes (Gamma-K, Gamma-M). Our measurements also indicate that an extended flatband is formed slightly above E(F) along Gamma-K. 相似文献
66.
A high catalytic activity and excellent stability of the vapor phase Koch-type carbonylation of tert-butyl alcohol towards 2,2-dimethylpropanoic acid on a H-ZSM-5 catalyst were achieved with a yield as high as 90% without any threat of deactivation in 120 h. 相似文献
67.
Izuru Kimura 《Journal of magnetism and magnetic materials》1987,70(1-3):273-274
Using the 12-sublattice model with Ising spin
, we analyze the magnetization process of DyCu2 theoretically. The necessary conditions for the exchange constants and the possible magnetic structures of DyCu2 are suggested. 相似文献
68.
A random site Ising model on the checkerboard square lattice with first neighbor interactionsJ
in all first neighbor bonds and second neighbor interactionsJ
in red squares is considered as a simple model of the dilute spin glass of Eu
p
Sr1–p
S. The phase boundary between the paramagnetic and ferromagnetic phases, and that between the paramagnetic and spin glass phases are calculated. The obtained phase diagram is qualitatively similar to the experimental result by Maletta and Convert. 相似文献
69.
N Nagakura S Souma T Shimizu K Uno Y Yanagihara 《Chemical & pharmaceutical bulletin》1991,39(3):765-768
The cross-reactivity of imipenem (IPM) in a delayed-type hypersensitivity (DTH) reaction was investigated by intradermal skin reaction, macrophage migration inhibition tests (MIT) and lymphocyte stimulation tests (LST) in guinea pigs. The animals were immunized with IPM, ampicillin (ABPC) or cephalexin (CEX) using Freund's complete adjuvant. Three sensitized-drugs exhibited the same immunogenicity in the skin reaction. The cross-reactivities in skin reaction among IPM, sulbactam, aztreonam, ABPC and 6-aminopenicillanic acid as penam, and CEX, ceftizoxime, 7-aminocephalosporanic acid as cephem were examined. IPM did not show cross-reactions with any of the tested drugs in three sensitized groups, indicating that the drugs possessed no cross-reactivity with tested beta-lactams in DTH. In MIT, 4 or 5 of 6 animals reacted to be sensitized drugs in each group. The cross-reactivity of IPM- and ABPC-sensitized groups in MIT was similar to that of a skin reaction, however, the CEX-sensitized animals showed broad cross-reactions. Using a kind of test drug, one or two animals in the ABPC-sensitized group showed migration enhancement, but IPM- or CEX-sensitized animals did not exhibit migration enhancement. In LST, most of the animals tested exhibited lymphocyte prolifration by sensitized drugs but a cross-reaction was scarcely observed. The above results suggest that among beta-lactams, IPM has a very low cross-reactivity. LST is considered to be more a useful assay than MIT for in vitro identification of causative drugs in animal models. 相似文献