研究業績

Toshihiko Oka

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Papers (refereed)

“Conformational Differences among Metarhodopsin I, Metarhodopsin II, and Opsin Probed by Wide-Angle X-ray Scattering”
Y. Imamoto*, K. Kojima, T. Oka, R. Maeda, and Y Shichida
The Journal of Physical Chemistry B, (2019) accepted, LINK  ACS-AOR

“Polar-nonpolar interfaces of inverse bicontinuous cubic phases in phytantriol/water system are parallel to triply periodic minimal surfaces.”
T Oka*, N Ohta, and ST Hyde
Langmuir, (2018.11), 34 (50), 15462-15469, LINK
  ACS-AOR

“Physicochemical Properties of the Mammalian Molecular Chaperone HSP60”
R Ishida, T Okamoto, F Motojima, H Kubota, H Takahashi, M Tanabe, T Oka, A Kitamura, M Kinjo, M Yoshida, M Otaka, E Grave, H Itoh*
International journal of molecular sciences, (2018.02) 19 (2), 489 LINK(open access)

“Small-Angle X-ray Crystallography on Single-Crystal Regions of Inverse Bicontinuous Cubic Phases: Lipid Bilayer Structures and Gaussian Curvature-Dependent Fluctuations”
T Oka*
The Journal of Physical Chemistry B, (2017.11), 121 (50), 11399-11409 LINK(open access)  PDF(SURE)

“Low-pH-Induced Lamellar to Bicontinuous Primitive Cubic Phase Transition in Dioleoylphosphatidylserine/Monoolein Membranes”
T Oka, M Hasan, MZ Islam, M Moniruzzaman, M Yamazaki*
Langmuir, (2017.10), 33 (43), 12487-12496 LINK(open access) PDF(SURE)

“Enhancing the Solubility and Oral Bioavailability of Poorly Water-Soluble Drugs using Monoolein Cubosomes ”
Ali MA., Kataoka N., Ranneh AH., Iwao Y., Noguchi S., Oka T., Itai S.*
Chemical & Pharmaceutical Bulletin, (2017.01),  65 (1), 42-48 LINK (open access)

“The use of surfactants to enhance the solubility and stability of the water-insoluble anticancer drug SN38 into liquid crystalline phase nanoparticles”
AH Ranneh, Y Iwao, S Noguchi, T Oka, S Itai*
International Journal of Pharmaceutics, (2016.12), 515 (1), 501-505,  LINK

“Two distinct cylinder arrangements in monodomains of a lyotropic liquid crystalline hexagonal II phase: monodomains with straight cylinders and ringed cylinders in capillaries”
Toshihiko Oka* and Noboru Ohta
Langmuir, (2016.08), 32(30), 7613-7620, LINK(open access)  PDF(SURE)

“Preparation and Characterization of SN-38-Encapsulated Phytantriol Cubosomes Containing α-Monoglyceride Additives
Md. Ashraf Ali, Shuji Noguchi, Yasunori Iwao, Toshihiko Oka, Shigeru Itai*
Chemical & Pharmaceutical Bulletin, (2016.06), 64(6), 577-584 LINK(open access)

“Activation Energy of the Low pH-Induced Lamellar to Bicontinuous Cubic Phase Transition in Dioleoylphosphatidylserine/Monoolein”
Toshihiko Oka, Takahiro Saiki, Jahangir Md. Alam, and Masahito Yamazaki*
Langmuir
,(2016.02), 32(5), 1327-1337 LINK(open access) PDF(SURE)

“Transformation between inverse bicontinuous cubic phases of a lipid from diamond to gyroid”
Toshihiko Oka*
Langmuir,(2015.10), 31(41), 11353-11359 LINK(open access)  PDF(SURE)

“Helical Rearrangement of Photoactivated Rhodopsin in Monomeric and Dimeric Forms Probed by High-Angle X-Ray Scattering”
Yasushi Imamoto*, Keiichi Kojima, Toshihiko Oka, Ryo Maeda, and Yoshinori Shichida
Photochemical & Photobiological Sciences, (2015.11), 14(11), 1965-1973 LINK

“Characterization and skin permeation of flurbiprofen loaded glyceryl monooleyl ether-based lyotropic liquid crystal system”
Tomonobu UCHINO*, Akiko MURATA, Yasunori MIYAZAKI, Toshihiko OKA, Satoru HASHIMOTO, Yoshiyuki KAGAWA
Chemical & Pharmaceutical Bulletin, (2015.05), 63(5), 334-340 LINK(open access)

“Transformation between inverse bicontinuous cubic phases of a lipid from diamond to primitive”
Toshihiko Oka*
Langmuir,(2015.03), 31(10), 3180-3185 LINK(open access)  PDF(SURE)

“Single Crystallization of an Inverse Bicontinuous Cubic Phase of a Lipid”
Toshihiko Oka* and Hiroki Hojo
Langmuir, (2014.07), 30 (28), 8253-8257 LINK(open access)  PDF(SURE)

“Initial Step of Low pH-Induced Lamellar to Bicontinuous Cubic Phase Transition in Dioleoylphosphatidylserine/Monoolein”
Toshihiko Oka, Taka-aki Tsuboi, Takahiro Saiki, Tomoki Takahashi, Jahangir Md. Alam, Masahito Yamazaki*
Langmuir, (2014.07), 30 (27), 8131-8140 LINK(open access)  PDF(SURE)

“Transdermal delivery of flurbiprofen from surfactant-based vesicles: Particle characterization and the effect of water on in vitro transport.”
Uchino T*, Matsumoto Y, Murata A, Oka T, Miyazaki Y, Kagawa Y
International Journal of Pharmaceutics, (2014.04) 464(1-2):75-84 LINK

“Dissection of the ATP-dependent conformational change cycle of a group II chaperonin”
Ayumi Nakagawa, Kazuki Moriya, Mayuno Arita, Yohei Yamamoto, Kyotaro Kitamura, Naoki Ishiguro, Taro Kanzaki, Toshihiko Oka, Koki Makabe, Kunihiro Kuwajima,  Masafumi Yohda*
Jourmal of Molecular Biology, (2014.01) 426(2):447-459 LINK

“Biochemical characterization and cooperation with co-chaperones of heat shock protein 90 from Schizosaccharomyces pombe”
Mari Ishida, Taichi Tomonari, Taro Kanzaki, Tetsuya Abe, Toshihiko Oka, Masafumi Yohda*
Journal of Bioscience and Bioengineering, (2013.10) 116(4):444-448 LINK

“Non equivalence observed for the 16-meric structure of a small heat shock protein, SpHsp16.0 from Schizosaccharomyces pombe”
Yuya Hanazono, Kazuki Takeda, Toshihiko Oka, Tetsuya Abe, Nobuhiko Akiyama, Yoshiki Aikawa, Masafumi Yohda, and Kunio Miki*
Structure, (2013.02) 21(2):220-228 LINK

“StHsp14.0, a small heat shock protein of Sulfolobus tokodaii strain 7, protects denatured proteins from aggregation in the partially dissociated conformation”
Tetsuya Abe, Toshihiko Oka, Atsushi Nakagome, Yoshihiro Tsukada, Takuo Yasunaga, and Masafumi Yohda*
Journal of Biochemistry, (2011.10) 150(4): 403-409 LINK

“Kinetics of Low pH-Induced Lamellar to Bicontinuous Cubic Phase Transition in Dioleoylphosphatidylserine/Monoolein”
Mahay Md. Alam, Toshihiko Oka, Noboru Ohta, and Masahito Yamazaki*
Journal of Chemical Physics, (2011.04) 134(14): 145102 LINK PDF(SURE)

A new approach for structure analysis of two-dimensional membrane protein crystals using X-ray powder diffraction data”
R. A. Dilanian, C. Darmanin, J. N. Varghese, S. W. Wilkins, T. Oka, N. Yagi, H. M. Quiney & K. A. Nugent
Protein Science, (2011.02) 20(2): 457-464 LINK

“Redox-Dependent Domain Rearrangement of Protein Disulfide Isomerase from a Thermophilic Fungus”
Masayoshi Nakasako, Aya Maeno, Eiji Kurimoto, Takushi Harada, Yoshiki Yamaguchi, Toshihiko Oka, Yuki Takayama, Aya Iwata and Koichi Kato
Biochemistry, (2010.07), 49 (32), 6953?6962 LINK

Adaptation of a hyperthermophilic group II chaperonin to relatively moderate temperatures”
T. Kanzaki, S. Ushioku, A. Nakagawa, T. Oka, K. Takahashi, T. Nakamura, K. Kuwajima, A. Yamagishi, M. Yohda
Protein Engineering Design & Selection, (2010.05) 23(5): 393-402.  LINK

Redox-Dependent Domain Rearrangement of Protein Disulfide Isomerase Coupled with Exposure of Its Substrate-Binding Hydrophobic Surface”
O. Serve, Y. Kamiya, A. Maeno, M. Nakano, C. Murakami, H. Sasakawa, Y. Yamaguchi, T. Harada, E. Kurimoto, M. Yagi-Utsumi, T. Iguchi, K. Inaba, J. Kikuchi, O. Asami, T. Kajino, T. Oka, M. Nakasako and K. Kato 
Journal of Molecular Biology, (2010.02) 396(2):361-374.  LINK

Sequential Action of ATP-dependent Subunit Conformational Change and Interaction between Helical Protrusions in the Closure of the Built-in Lid of Group II Chaperonins”
Taro Kanzaki, Ryo Iizuka, Kazunobu Takahashi, Kosuke Maki, Rie Masuda, Muhamad Sahlan, Hugo Y?benes, Jos? M. Valpuesta, Toshihiko Oka, Masahiro Furutani, Noriyuki Ishii, Kunihiro Kuwajima and Masafumi Yohda
Journal of Biological Chemistry, (2008.12) 283(50):34773-84
 LINK

“Crystallization and preliminary X-ray diffraction anaylsis of the LOV1 domains of phototropin 1 and 2 from Arabidopsis thaliana. “
Nakasako M, Hirata M, Shimizu N, Hosokawa S, Matsuoka D, Oka T, Yamamoto M, Tokutomi S.
Acta Crystallogr Sect F Struct Biol Cryst Commun. (2008.07) 64(7):617-21 LINK

“High-resolution powder diffraction study of purple membrane with a large Guinier-type camera”
Toshihiko Oka, Keiko Miura, Katsuaki Inoue, Tatzuo Ueki and Naoto Yagi
Journal of Synchrotron Radiation, (2006.05) 13(3), 281-284 LINK

“Conformational dynamics of complementary determining region H3 of an anti-dansyl Fv fragment in the presence of its hapten”
Masayoshi Nakasako, Toshihiko Oka, Masayasu Mashumo, Hideo Takahashi, Ichio Shimada, Yoshiki Yamaguchi, Koichi Kato and Yoji Arata
Journal of Molecular Biology (2005.08) 351(3), 627-640 LINK

“Structural analysis of cell membrane complex of a hair fibre by micro-beam X-ray diffraction.”
Noboru Ohta, Toshihiko Oka, Katsuaki Inoue, Naoto Yagi, Satoru Kato and Ichiro Hatta
Journal of Applied Crystallography. (2005.04) 38(2), 274-279 LINK

“Structural transition of bacteriorhodopsin is preceded by deprotonation of Schiff base: Microsecond time-resolved X-ray diffraction study of purple membrane.”
Toshihiko Oka , Katsuaki Inoue , Mikio Kataoka, Naoto Yagi
Biophysical Journal, (2005.01) 88(1), 436-442 LINK

“CCD-based X-ray Area Detectors for Time-resolved Experiments”
Naoto Yagi, Katsuaki Inoue and Toshihiko Oka 
Journal of Synchrotron Radiation, (2004.11) 11(6), 456-461 LINK

“Picometer-scale dynamical observations of individual membrane proteins: The case of bacteriorhodopsin”
Yasuaki Okumura, Toshihiko Oka, Mikio Kataoka, Yoshio Taniguchi, and Yuji C. Sasaki
Physical Review E, (2004.08) 70(2), 021917 LINK

“X-ray imaging microscopy using Fresnel zone plate objective and quasi-monochromatic undulator radiation.”
Suzuki, Y., Takeuchi, A., Takano, H., Uesugi, K., Oka, T., and Inoue, K 
Review of Scientific Instruments (2004.04) 75 (4), 1155-1157.LINK

Time-resolved x-ray diffraction reveals movement of F helix of D96N bacteriorhodopsin during M-MN transition at neutral pH.”
Oka, T., Yagi, N., Tokunaga, F., and Kataoka, M.
Biophysical Journal (2002.05) 82(5): 2610-2616. LINK

Light-induced unfolding of photoactive yellow protein mutant M100L.”
Sasaki, J., Kumauchi, M., Hamada, N., Oka, T., and Tokunaga, F.
Biochemistry. (2002.01) 41(6), 1915-22. LINK

Time-resolved x-ray diffraction reveals multiple conformations in the M-N transition of the bacteriorhodopsin photocycle.”  
Oka, T., Yagi, N., Fujisawa, T., Kamikubo, H., Tokunaga, F., and Kataoka, M.,  
Proceedings of National Academy of Science USA (2000.12) 97(26), 14278-14282. LINK

Small-angle x-ray scattering station at the SPring-8 RIKEN beamline.”
Fujisawa, T., Inoue, K., Oka, T., Iwamoto, H., Uruga, T., Kumasaka, T., Inoko, Y., Yagi, N., Yamamoto, M., and Ueki, T.  
Journal of Applied Crystallography. (2000.06) 33(3), 797-800 LINK

Dynamical and structural modifications of staphylococcal nuclease on C-terminal truncation.”  
Kataoka, M., Ferrand, M., Goupil-Lamy, A.V., Kamikubo, H., Yunoki, J., Oka, T., and Smith, J.C.  
Physica B (1999.05) 266(1-2), 20-26. LINK

Conformational change of helix G in the bacteriorhodopsin photocycle: investigation with heavy atom labeling and x-ray diffraction.”  
Oka, T., Kamikubo, H., Tokunaga, F., Lanyi, J. K., Needleman, R., and Kataoka, M.
Biophysical Journal (1999.02) 76(2): 1018-1023 LINK

X-ray diffraction studies of bacteriorhodopsin. determination of the positions of mercury label at several engineered cystein residues.”  
Oka, T., Kamikubo, H., Tokunaga, F., Lanyi, J. K., Needleman, R., and Kataoka, M.
Photochemistry and Photobiology (1997.12) 66(6), 768-773. LINK

The last phase of the reprotonation switch in bacteriorhodopsin: the transition between the M-type and the N-type protein conformation depends on hydration.”  
Kamikubo, H., Oka, T., Imamoto, Y., Tokunaga, F., Lanyi, J. K., and Kataoka, M.  
Biochemistry (1997.10) 36(40), 12282-12287. LINK

Structure of the N intermediate of bacteriorhodopsin revealed by x-ray diffraction.”  
Kamikubo, H., Kataoka, M., Varo, G., Oka, T., Tokunaga, F., Needleman, R., and Lanyi, J. K. 
Proceedings of National Academy of Science USA (1996.02) 93(4), 1386-1390. LINK

Papers (others)

“Adaptation of a hyperthermophilic group II chaperonins to relatively moderate temperatures”
Taro Kanzaki, Toshihiko Oka, and Masafumi Yohda
SPring-8 Research Frontiers 2010, (2011) 42-43 PDF

High-resolution powder diffraction from purple membrane”
Toshihiko Oka
SPring-8 Research Frontiers 2006, (2007) 158-159 PDF

「時分割X線回折法による紫膜の光反応過程の研究」
岡俊彦
放射光、(2007)20(2)130-132

Microsecond Time-resolved Diffraction and Scattering Measurements System Using Semi-monochromatic X-ray Pulse at SPring-8 BL40XU“
Toshihiko Oka, Katsuaki Inoue, and Naoto Yagi
AIP Conference Proceedings (2004) 705, 1197-1200 LINK

“Present Status of BL40B2 and BL40XU at SPring-8 (Beamlines for Small Angle X-ray Scattering)”
Katsuaki Inoue, Toshihiko Oka, Keiko Miura, and Naoto Yagi
AIP Conference Proceedings (2004) 705, 336-339 LINK

“Dynamical Observations of Membrane Proteins: The Case of Bacteriorhodopsin”
Yasuaki Okumura, Toshihiko Oka, Yoshio Taniguchi, and Yuji C. Sasaki
AIP Conference Proceedings (2004) 705, 1174-1177 LINK

“Subnanosecond-Resolved X-ray Diffraction at the SPring-8 High Flux Beamline BL40XU”
Shin-ichi Adachi, Katsuaki Inoue, Toshihiko Oka, Naoto Yagi, Yoshihito Tanaka, Tetsuya Ishikawa, and Yoshitsugu Shiro
AIP Conference Proceedings (2004) 705, 1383-1386 LINK

SPring-8 BL40XU用高時間分解能CCDカメラおよびX線イメージインテンシファイア」
岡俊彦、井上勝晶、八木直人
放射線、(2003)29(1)13-16

Time-resolved X-ray diffraction experiments of purple membrane.”
Toshihiko Oka
Spring-8 Research Frontiers 1999/2000, (2001) 17-19 PDF

In-vacuum X-ray helical undulator for high flux beamline.”
Hara, T., Tanaka, T., Seike, T., Bizen, T., Marechal, X., Kohda, T., Inoue, K., Oka, T., Suzuki, T., Yagi, N., and Kitamura, H.
Nuclear Instruments and Methods in Physics A. (2001) 467-468, 165-168. LINK

Present Status of high flux beamline (BL40XU) at SPring-8.”
Inoue, K., Oka, T., Suzuki, T., Yagi, N., Takeshita, K., Goto, S., and Ishikawa, T.
Nuclear Instruments and Methods in Physics A. (2001) 467-468, 674-677. LINK

SPring-8BL40XUにおける時分割X線回折測定技術」
岡俊彦、井上勝晶、八木直人
放 射 光、(2001) 14(5), 384-388

「バクテリオロドプシンの光反応中間体の構造とプロトンポンプ機構」
岡俊彦、上久保裕生、片岡幹雄
放 射 光、(199912(3)184-193