KOICHI MATSUO

Last Updated :2026/04/06

Affiliations, Positions
Research Institute for Synchrotron Radiation Science, Professor
E-mail
pikahiroshima-u.ac.jp

Basic Information

Academic Degrees

  • Doctor of Science, Hiroshima University
  • Master of Science, Hiroshima University

Research Fields

  • Biology;Biological Science;Biophysics

Research Keywords

  • Synchrotron Radiation, Circular Dichroism, and Biomolecule

Affiliated Academic Societies

  • The Biophysical Society of Japan
  • The Japanese Society for Synchrotron Radiation Research
  • The Chemical Society of Japan
  • Protein Science Society of Japan

Educational Activity

Course in Charge

  1. 2026, Undergraduate Education, Second Semester, Exercise in Electromagnetism and Quantum Mechanics
  2. 2026, Undergraduate Education, First Semester, Special Study for Graduation A
  3. 2026, Undergraduate Education, Second Semester, Special Study for Graduation B
  4. 2026, Graduate Education (Master's Program) , 3Term, Introductory Course to Advanced Physics
  5. 2026, Graduate Education (Master's Program) , 1Term, Special Topics in Synchrotron Radiation Science A
  6. 2026, Graduate Education (Master's Program) , Second Semester, Laboratory in Synchrotron Radiation Science
  7. 2026, Graduate Education (Master's Program) , First Semester, Exercise in Physics I
  8. 2026, Graduate Education (Master's Program) , Second Semester, Exercise in Physics II
  9. 2026, Graduate Education (Master's Program) , First Semester, Special Exsecise in Physics A
  10. 2026, Graduate Education (Master's Program) , Second Semester, Special Exsecise in Physics B
  11. 2026, Graduate Education (Master's Program) , Year, Special Research in Physics
  12. 2026, Graduate Education (Doctoral Program) , Year, Special Research in Physics

Research Activities

Academic Papers

  1. Structural phases in Ca2+-triggered alginate assembly and gelation: circular dichroism-guided multimodal analysis, SOFT MATTER, 22(4), 1033-1043, 20260128
    Link to Paper Search Results by DOI
  2. Advances in Synchrotron Radiation-Based Vacuum-Ultraviolet Circular Dichroism for Biomolecular Structural Analysis, CHEMISTRY-AN ASIAN JOURNAL, 21(2), 202601
    Link to Paper Search Results by DOI
  3. Effect of Sucrose and Sucralose on the Gelation of Gelatin, BIOMACROMOLECULES, 26(11), 8280-8288, 20251110
    Link to Paper Search Results by DOI
  4. An overview on marine bacterial exopolysaccharides and their industrial applications, JOURNAL OF CARBOHYDRATE CHEMISTRY, 44(4-6), 95-132, 20250724
    Link to Paper Search Results by DOI
  5. Salt-Induced Membrane-Bound Conformation of the NAC Domain of α-Synuclein Leads to Structural Polymorphism of Amyloid Fibrils, BIOMOLECULES, 15(4), 20250331
    Link to Paper Search Results by DOI
  6. Synthesis, Chiroptical Properties, and Absolute Configuration Determination of Phenyl-4-pyridyl-2,5-dipyrimidinylmethane, ASIAN JOURNAL OF ORGANIC CHEMISTRY, 14(1), 202501
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  7. Salt-Induced Hydrophobic C-Terminal Region of α-Synuclein Triggers Its Fibrillation under the Mimic Physiologic Condition, LANGMUIR, 40(39), 20537-20549, 20240917
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  8. Potential Bioactivities, Chemical Composition, and Conformation Studies of Exopolysaccharide-Derived Aspergillus sp. Strain GAD7, JOURNAL OF FUNGI, 10(9), 202409
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  9. Structure Assessment and Impacts of Lipids' Chemistry on the Structuration of Polyhydroxyalkanoate Biosynthesized by Bacillus licheniformis AZU-A5, CHIRALITY, 36(10), 202410
    Link to Paper Search Results by DOI
  10. Structural Investigations of Cargo Molecules Inside Icosahedrally Symmetric Encapsulin by VUVCD Spectroscopic Measurements, CHIRALITY, 36(8), 202408
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  11. Observation of the Liquid-Liquid Phase Separation of FUS-LC Using Vacuum-Ultraviolet Circular Dichroism Spectroscopy, CHIRALITY, 36(8), 202408
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  12. Dynamic Observation of the Membrane Interaction Processes of ﾎｲ-Lactoglobulin by Time-Resolved Vacuum-Ultraviolet Circular Dichroism, ANALYTICAL CHEMISTRY, 96(26), 10524-10533, 20240622
    Link to Paper Search Results by DOI
  13. Phospholipid-induced secondary structural changes of lysozyme polymorphic amyloid fibrils studied using vacuum-ultraviolet circular dichroism, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 26(27), 18943-18952, 20240710
    Link to Paper Search Results by DOI
  14. pH-dependent regulation of an acidophilic O-acetylhomoserine sulfhydrylase from Lactobacillus plantarum, APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 90(5), 20240521
    Link to Paper Search Results by DOI
  15. Investigation of α-glucosidase and α-amylase inhibition for antidiabetic potential of agarwood (Aquilaria malaccensis) leaves extract, BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY, 58, 202406
    Link to Paper Search Results by DOI
  16. Protein Preferential Solvation in (Sucralose plus Water) Mixtures, JOURNAL OF PHYSICAL CHEMISTRY B, 128(3), 676-683, 20240110
    Link to Paper Search Results by DOI
  17. Characterization of membrane-interaction mechanisms of proteins using vacuum-ultraviolet circular dichroism spectroscopy, CHIRALITY, 35(11), 826-837, 202311
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  18. Structural study of wild-type and phospho-mimic XRCC4 dimer and multimer proteins using circular dichroism spectroscopy, INTERNATIONAL JOURNAL OF RADIATION BIOLOGY, 99(11), 1684-1691, 20231102
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  19. Lipid-membranes interaction, structural assessment, and sustainable production of polyhydroxyalkanoate by Priestia filamentosa AZU-A6 from sugarcane molasses, INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, 242, 20230701
    Link to Paper Search Results by DOI
  20. Complementary spectroscopy studies and potential activities of levan-type fructan produced by Bacillus paralicheniformis ND2, CARBOHYDRATE POLYMERS, 311, 20230701
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  21. A novel gyrase inhibitor from toxin-antitoxin system expressed by Staphylococcus aureus, FEBS JOURNAL, 290(6), 1502-1518, 202303
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  22. Secondary structural analyses of histone H2A-H2B proteins extracted from heated cells, CHIRALITY, 35(3), 165-171, 202303
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  23. Biological effects of the loss of homochirality in a multicellular organism, NATURE COMMUNICATIONS, 13(1), 20221118
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  24. Quantification and Improvement of the Dynamics of Human Serum Albumin and Glycated Human Serum Albumin with Astaxanthin/Astaxanthin-Metal Ion Complexes: Physico-Chemical and Computational Approaches, INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES, 23(9), 20220501
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  25. Helically aligned fused carbon hollow nanospheres with chiral discrimination ability, NANOSCALE, 14(10), 3748-3757, 20220310
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  26. Formation of beta-Strand Oligomers of Antimicrobial Peptide Magainin 2 Contributes to Disruption of Phospholipid Membrane, MEMBRANES, 12(2), 20220201
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  27. Kinetics of denaturation and renaturation processes of double-stranded helical polysaccharide, xanthan in aqueous sodium chloride, CARBOHYDRATE POLYMERS, 275, 20220101
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  28. Conformation of myelin basic protein bound to phosphatidylinositol membrane characterized by vacuum-ultraviolet circular-dichroism spectroscopy and molecular-dynamics simulations, PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS, 89(10), 1251-1261, 20211001
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  29. Secondary Structure of Human De Novo Evolved Gene Product NCYM Analyzed by Vacuum-Ultraviolet Circular Dichroism, FRONTIERS IN ONCOLOGY, 11, 20210823
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  30. Assignment of Absolute Configuration of Bromoallenes by Vacuum-Ultraviolet Circular Dichroism (VUVCD), MOLECULES, 26(5), 20210301
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  31. Studies on saccharide benzimidazoles: 2-(beta-D-gulofuranosyl)benzimidazole and 2-(beta-D-glucofuranosyl)benzimidazole C-nucleoside analogs; synthesis, anomeric configuration and antifouling potency, CARBOHYDRATE RESEARCH, 496, 20201001
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  32. The high-resolution crystal structure of lobster hemocyanin shows its enzymatic capability as a phenoloxidase, ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS, 688, 20200730
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  33. Characterization of the mechanism of interaction between alpha(1)-acid glycoprotein and lipid membranes by vacuum-ultraviolet circular-dichroism spectroscopy, CHIRALITY, 32(5), 594-604, 20200501
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  34. Vacuum Ultraviolet Electronic Circular Dichroism Study of D-Glucose in Aqueous Solution, JOURNAL OF PHYSICAL CHEMISTRY A, 124(4), 642-651, 20200130
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  35. Regulation of plant ER oxidoreductin 1 (ERO1) activity for efficient oxidative protein folding, JOURNAL OF BIOLOGICAL CHEMISTRY, 294(49), 18820-18835, 20191206
    Link to Paper Search Results by DOI
  36. Study on Irradiation Effect of Mid-Infrared Free Electron Laser on Hen Egg-White Lysozyme by Using Terahertz-Time Domain Spectroscopy and Synchrotron-Radiation Vacuum-Ultraviolet Circular-Dichroism Spectroscopy, JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES, 40(10), 998-1009, 20191001
    Link to Paper Search Results by DOI
  37. STRUCTURAL ANALYSIS OF DNA REPAIR PROTEIN XRCC4 APPLYING CIRCULAR DICHROISM IN AN AQUEOUS SOLUTION, RADIATION PROTECTION DOSIMETRY, 183(1-2), 36-39, 20190501
    Link to Paper Search Results by DOI
  38. Synchrotron-Radiation Vacuum-Ultraviolet Circular-Dichroism Spectroscopy for Characterizing the Structure of Saccharides, Glycobiophysics, Advances in Experimental Medicine and Biology, 1104, 101-117, 20181228
  39. Sample-volume reduction using the Schwarzschild objective for a circular dichroism spectrophotometer and an application to the structural analysis of lysine-36 trimethylated histone H3 protein, Molecules, 20181123
  40. Structural analysis of lysine-4 methylated histone H3 proteins using synchrotron radiation circular dichroism spectroscopy, CHIRALITY, 30(5), 536-540, 20180501
    Link to Paper Search Results by DOI
  41. Circular dichroism spectroscopic study on structural alterations of histones induced by post-translational modifications in DNA damage responses: lysine-9 methylation of H3, JOURNAL OF RADIATION RESEARCH, 59(2), 108-115, 20180301
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  42. Secondary Structure Prediction of Protein Constructs Using Random Incremental Truncation and Vacuum-Ultraviolet CD Spectroscopy, PLOS ONE, 11(6), 20160607
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  43. Isotope effect on the circular dichroism spectrum of methyl alpha-D-glucopyranoside in aqueous solution, SCIENTIFIC REPORTS, 5, 20151214
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  44. Vacuum-Ultraviolet Circular Dichroism Spectra of Escherichia coli Dihydrofolate Reductase and Its Mutants: Contributions of Phenylalanine and Tyrosine Side Chains and Exciton Coupling of Two Tryptophan Side Chains, JOURNAL OF PHYSICAL CHEMISTRY B, 119(41), 13002-13008, 20151015
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  45. Niphateolide A: isolation from the marine sponge Niphates olemda and determination of its absolute configuration by an ECD analysis, TETRAHEDRON, 71(38), 6956-6960, 20150923
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  46. Role of cysteine residues in the V(V)-reductase activity of Vanabin2, INORGANICA CHIMICA ACTA, 420, 47-52, 20140824
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  47. Characterization of Intermolecular Structure of beta(2)-Microglobulin Core Fragments in Amyloid Fibrils by Vacuum-Ultraviolet Circular Dichroism Spectroscopy and Circular Dichroism Theory, JOURNAL OF PHYSICAL CHEMISTRY B, 118(11), 2785-2795, 20140320
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  48. Construction of a Synchrotron-Radiation Vacuum-Ultraviolet Circular-Dichroism Spectrophotometer and Its Application to the Structural Analysis of Biomolecules, BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 86(6), 675-689, 20130615
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  49. Vacuum-ultraviolet circular dichroism of Escherichia coli dihydrofolate reductase: Insight into the contribution of tryptophan residues, CHEMICAL PHYSICS LETTERS, 572, 111-114, 20130530
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  50. A sensitive method based on fluorescence-detected circular dichroism for protein local structure analysis, ANALYTICAL BIOCHEMISTRY, 430(2), 179-184, 20121115
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  51. Vacuum-Ultraviolet Electronic Circular Dichroism Study of Methyl alpha-D-Glucopyranoside in Aqueous Solution by Time-Dependent Density Functional Theory, JOURNAL OF PHYSICAL CHEMISTRY A, 116(40), 9996-10003, 20121011
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  52. Differences in the Molecular Structure of beta(2)-Microglobulin between Two Morphologically Different Amyloid Fibrils, BIOCHEMISTRY, 49(4), 742-751, 20100202
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  53. Membrane-Induced Conformational Change of alpha(1)-Acid Glycoprotein Characterized by Vacuum-Ultraviolet Circular Dichroism Spectroscopy, BIOCHEMISTRY, 48(38), 9103-9111, 20090929
    Link to Paper Search Results by DOI
  54. Amyloid protofibril is highly voluminous and compressible, BIOCHEMISTRY, 46(37), 10444-10450, 20070918
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  55. Secondary-structure analysis of denatured proteins by vacuum-ultraviolet circular dichroism spectroscopy, BIOPHYSICAL JOURNAL, 92(11), 4088-4096, 20070601
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  56. Vacuum-ultraviolet circular dichroism analysis of biomolecules, CHIRALITY, 18(5), 329-334, 20060515
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  57. Vacuum-ultraviolet electronic circular dichroism of L-alanine in aqueous solution investigated by time-dependent density functional theory, JOURNAL OF PHYSICAL CHEMISTRY A, 109(31), 6928-6933, 20050811
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  58. Vacuum-ultraviolet circular dichroism study of saccharides by synchrotron radiation spectrophotometry, CARBOHYDRATE RESEARCH, 339(3), 591-597, 20040225
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  59. Vacuum-ultraviolet circular dichroism of amino acids as revealed by synchrotron radiation spectrophotometer, CHEMISTRY LETTERS, 826-827, 20020805
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  60. Vacuum-ultraviolet circular dichroism spectrophotometer using synchrotron radiation: Optical system and on-line performance, CHEMISTRY LETTERS, 522-523, 20010605
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  61. DNA damage response induces structural alterations in histone H3-H4, JOURNAL OF RADIATION RESEARCH, 58(1), 59-65, 201701
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  62. Conformation of membrane-bound proteins revealed by vacuum-ultraviolet circulardichroism and linear-dichroism spectroscopy, PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS, 84(3), 349-359, 201603
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  63. Overexpression, purification, and characterization of Paenibacillus cell surface-expressed chitinase ChiW with two catalytic domains, BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 78(4), 624-634, 201404
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  64. Roussoellols A and B, Tetracyclic Fusicoccanes from Roussoella hysterioides, JOURNAL OF NATURAL PRODUCTS, 76(6), 1047-1051, 201306
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  65. Secondary-structure analysis of alcohol-denatured proteins by vacuum-ultraviolet circular dichroism spectroscopy, PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS, 80(1), 281-293, 201201
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  66. Comprehensive secondary-structure analysis of disulfide variants of lysozyme by synchrotron-radiation vacuum-ultraviolet circular dichroism, PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS, 77(1), 191-201, 200910
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  67. Characterization of vanadium-binding sites of the vanadium-binding protein Vanabin2 by site-directed mutagenesis, BIOCHIMICA ET BIOPHYSICA ACTA-GENERAL SUBJECTS, 1790(10), 1327-1333, 200910
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  68. A novel vanadium reductase, Vanabin2, forms a possible cascade involved in electron transfer, BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS, 1794(4), 674-679, 200904
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  69. Vacuum-Ultraviolet Circular Dichroism Analysis of Glycosaminoglycans by Synchrotron-Radiation Spectroscopy, BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 73(3), 557-561, 200903
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  70. Improved sequence-based prediction of protein secondary structures by combining vacuum-ultraviolet circular dichroism spectroscopy with neural network, PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS, 73(1), 104-112, 200810
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  71. Selective metal binding by Vanabin2 from the vanadium-rich ascidian, Ascidia sydneiensis samea, BIOCHIMICA ET BIOPHYSICA ACTA-GENERAL SUBJECTS, 1760(7), 1096-1101, 200607
    Link to Paper Search Results by DOI
  72. Improved estimation of the secondary structures of proteins by vacuum-ultraviolet circular dichroism spectroscopy, JOURNAL OF BIOCHEMISTRY, 138(1), 79-88, 200507
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  73. Structure analyses of biomolecules using a synchrotron radiation circular dichroism spectrophotometer, JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 144, 295-297, 200506
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  74. Vacuum-ultraviolet circular dichroism spectrophotometer using synchrotron radiation, JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 144, 1023-1025, 200506
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  75. Secondary-structure analysis of proteins by vacuum-ultraviolet circular dichroism spectroscopy, JOURNAL OF BIOCHEMISTRY, 135(3), 405-411, 200403
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  76. Optical cell with a temperature-control unit for a vacuum-ultraviolet circular dichroism spectrophotometer, ANALYTICAL SCIENCES, 19(1), 129-132, 200301
    Link to Paper Search Results by DOI
  77. Vacuum-ultraviolet circular-dichroism study of oligosaccharides using a synchrotron-radiation spectroscopy, Biomed. Spectrosc. Imaging, 6, 111-121, 2017
  78. Vacuum-Ultraviolet Circular Dichroism Spectra of Escherichia coli Dihydrofolate Reductase and Its Mutants: Contributions of Phenylalanine and Tyrosine Side Chains and Exciton Coupling of Two Tryptophan Side Chains, JOURNAL OF PHYSICAL CHEMISTRY B, 119, 13002-13008, 2015
  79. Solution structures of methyl aldopyranosides revealed by vacuum-ultraviolet electronic circular-dichroism spectroscopy, BIOMEDICAL SPECTROSCOPY AND IMAGING, 4(3), 269-282, 2015
    Link to Paper Search Results by DOI
  80. Solution structures of methyl aldopyranosides revealed by vacuum-ultraviolet electronic circular-dichroism spectroscopy, Biomedical Spectroscopy and Imaging, 4, 269-282, 2015
  81. An alternative allosteric regulation mechanism of an acidophilic L-lactate dehydrogenase from Enterococcus mundtii 15-1A, FEBS OPEN BIO, 4, 834-847, 2014
    Link to Paper Search Results by DOI
  82. Study on interaction between phosphatidylcholine(PC) liposome and gold nanoparticles by TEM observation, Journal of Surface Analysis, 20, 230-233, 2014
  83. Effect of sugars on aging of gelatin gels by vacuum-ultraviolet circular dichroism and rheological measurements, Journal of Biorheology, 28, 38-44, 2014
  84. An alternative allosteric regulation mechanism of an acidophilic l-lactate dehydrogenase from Enterococcus mundtii 15-1A., An alternative allosteric regulation mechanism of an acidophilic l-lactate dehydrogenase from Enterococcus mundtii 15-1A., 4, 2014
  85. Circular-dichroism and synchrotron-radiation circular-dichroism spectroscopy as tools to monitor protein structure in a lipid environment, Methods in Molecular Biology, 974, 152-176, 2013
  86. Adsorption reaction of L-cysteine on Au nanoparticle prepared by solution plasma, e-Journal of Surface Science and Nanotechnology, 11, 18-24, 2013
  87. Experimental and Theoretical Studies of Vacuum-Ultraviolet Electronic Circular Dichroism of Hydroxy Acids in Aqueous Solution, CHIRALITY, 23(1E), E52-E58, 2011
    Link to Paper Search Results by DOI
  88. Spectroscopic characterization of inter-molecular interaction of amyloid beta promoted on GM1 micelles, International Journal of Alzheimer's Disease, 2011
  89. Spectroscopic study on the reaction of L-cysteine in Rh(PVP) nanoparticle colloidal solution, e-Journal of Surface Science and Nanotechnology, 7, 314-318, 2009

Invited Lecture, Oral Presentation, Poster Presentation

  1. Characterization of Biomolecule Structure using Synchrotron Radiation Spectroscopy in Ultraviolet Region, Koichi Matsuo, Kickoff Core-to-Core ChiFxM & Kickoff IRP ChiFiMi & Annual KiNOA day Joint Symposium 2025, 2025/11/16, With Invitation, English, IECB, Bordeaux, France
  2. Synchrotron radiation chiral spectroscopy in ultraviolet region and structural characterization of biomolecules, Koichi Matsuo, The 63rd Annual Meeting of the Biophysical Society of Japan, 2025/09/21, With Invitation, English
  3. Mechanism of Amyloid Fibril Formation of alpha-Synuclein Interacted with Membrane Analyzed by Vacuum-Ultraviolet Circular Dichroism and Linear Dichroism, Koichi Matsuo, Ryota Imaura, 20th International Conference on Chiroptical Spectroscopy (CD2025), 2025/08/27, With Invitation, English, Debrecen, Hungary
  4. UV synchrotron radiation chiral spectroscopy to characterize the structure of biomolecule, Koichi Matsuo, SPIE Optics + Photonics, 2025/08/03, With Invitation, English, San diego (USA)
  5. Experimental and theoretical approaches for observing the interaction between biomolecules and optical vortex in ultraviolet region, Koichi Matsuo, Masahiro Kato, Hideki Kawaguchi, Ryota Imaura, Satoshi Hashimoto, Yu Nishihara, The 11th Optical Manipulation and Structured Materials Conference (OMC2024), 2024/04/26, Without Invitation, English
  6. Synchrotron Radiation Chiral Spectroscopy to Characterize the Structure of Biomolecule, Koichi Matsuo, OIST-JST-AIMR Joint International Symposium: Interaction Between Various Chiral Fields and Chiral Materials Radiation, 2024/06/07, With Invitation, English
  7. Interaction Mechanism between alpha1-Acid Glycoprotein and Membrane Characterized by Vacuum-Ultraviolet Circular-Dichroism Spectroscopy, Koichi Matsuo, Hirofumi Namatame, Masaki Taniguchi, Kunihiko Gekko, The 56th Annual Meeting of The Biophysical Society of Japan, 2018/09/15, Without Invitation, English, Okayama
  8. Vacuum-Ultraviolet Circular-Dichroism Study of Oligosaccharide Conformations using a Synchrotron-Radiation Spectrophotometer, Koichi Matsuo, 29th International Carbohydrate Symposium - ICS 2018, 2018/07/13, Without Invitation, English, Lisbon, Portugal
  9. Characterization of Biomolecule Structures by Synchrotron-Radiation Vacuum-Ultraviolet Circular-Dichroism Spectroscopy, K. Matsuo, 4th International Symposium on Hybrid Materials and Processing, 2017/11, With Invitation, English, Pusan, Korea