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Research Unit for Molecular Systems Immunology
Makio TOKUNAGA
Unit Leader
Makio TOKUNAGA (Ph.D.)
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Research Areas

Single molecule imaging and simultaneous visualization of multi-kind molecules in cells enabled the quantification of molecular dynamics, interactions and kinetics. Based on these three-dimensional and temporal parameters, we examine numerical modeling and computer simulations of cell functions, Using the combination of single molecule quantification and "in silico" modeling, we aim to open up new frontiers for understanding immune cells as molecular systems.

Research Subject

  1. Development of single-molecule systems biology.

Related links

  1. RIKEN Research Center for Allergy and Immunology Website_Laboratories PageNew Window

RIKEN RESEARCH

May 23, 2008
Looking beneath the surface
A new imaging technique allows scientists to effectively visualize individual molecules within living cells in real-timeNew Window

List of Selected Publications

  1. Fukagawa, A., Hiroshima, M., Sakane, I.,and Tokunaga, M.:
    "Stochastic emergence of multiple intermediates detected by single-molecule quasi-static mechanical unfolding of protein."
    PLoS One. 4 (8), e6599 (2009).
  2. Miletic, AV., Graham, DB., Sakata-Sogawa, K., Hiroshima, M., Hamann, HJ., Cemerski, S., Kloeppel, T., Billadearu,DD., Kanagawa,O., Tokunaga, M., and Swat, W.:
    "Vav Links the T Cell Antigen Receptor to the Actin Cytoskelton and T Cell Activation Independently of Intrinsic Guanine Nucleotide Exchange Activity."
    BIOPHYSICS, 5, 25-35 (2009)
  3. Fukagawa, A., Hiroshima, M., Sakane, I.,and Tokunaga, M.:
    "Observation of Multiple and Stochastic Transition States by a Feedback-controlled Single-molecule Force Measurement."
    Anal Sci., 25, 5-7 (2009).
  4. Yokosuka, T, Kobayashi, W., Sakata-Sogawa, K., Takamatsu, M., Hashimoto-Tane, A., Dustin, M.L., Tokunaga, M. and Saito,T.:
    "Spatiotemporal regulation of T cell co-stimulation by TCR-CD28 microclusters through PKCq translocation."
    Immunity, 29, 589-601 (2008)
  5. Tokunaga, M., Imamoto, N., Sakata-Sogawa, K.:
    "Highly inclined thin illumination enables clear single-molecule imaging in cells."
    Nat Methods, 5, 159-161 (2008).
  6. Yamasaki, S., Sakata-Sogawa, K., Hasegawa, A., Suzuki, T., Kabu, K., Sato, E., Kurosaki, T., Yamashita, S., Tokunaga, M., Nishida, K., Hirano, T.:
    "Zinc is a novel second messenger."
    J. Cell Biol. 177, 637-645 (2007)
  7. Yamasaki, S., Ishikawa, E., Sakuma, M., Ogata, K., Sakata-Sogawa, K., Hiroshima, M., Wiest, D. L., Tokunaga, M., and Saito, T.:
    "Mechanistic basis of pre-T cell receptor-mediated autonomous signaling critical for thymocyte development."
    Nature Immunol., 7, 67-75 (2006).
  8. Yokosuka, T., Sakata-Sogawa, K., Kobayashi, W., Hiroshima, M., Hashimoto-Tane, A., Tokunaga, M., Dustin, M. L., and Saito, T.:
    "Newly generated T cell receptor microclusters initiate and sustain T cell activation by recruitment of Zap70 and SLP-76."
    Nature Immunol., 6, 1253-1262 (2005).
  9. Kitamura, K., Tokunaga, M., Iwane, A. H., and Yanagida, T.:
    "A single myosin head moves along an actin filament with regular steps of 5.3 nanometres."
    Nature, 397, 129-134 (1999).
  10. Tokunaga, M., Kitamura, K., Saito, K., Iwane, A. H., and Yanagida, T.:
    "Single Molecule Imaging of Fluorophores and Enzymatic Reactions Achieved by Objective-type Total Internal Reflection Fluorescence Microscopy."
    Biochem. Biophys. Res. Comm., 235, 47-53 (1997).

Members

Principal Investigator

Makio TOKUNAGA
Unit Leader

Members

Yuma ITOU
 
Jun TAKIMOTO
 
Masahiro SHIMOZAWA
 
Katsuo ICHINOMIYA
 
Ryuta OKADA
 
Satoshi IKEDA
 
Naomichi INABA
 
Hirofumi OYAMA