Chief Scientist Laboratories Cellular Informatics Laboratory
Chief Scientist: Yasushi Sako (D.Sc.)
Research Summary
Complex and flexible behaviors of living cells are outputs of intracellular signaling molecule systems. Unitary reactions in molecular systems are stochastic events, use energy as low as thermal fluctuation, and the average number of molecules involved is sometimes less than 100 suggesting significant number fluctuation in individual cells. Thus, molecular systems are suffering large fluctuations even though cells look like to be acting purposively searching both internal and external environments. Cells seem to have special mechanisms to suppress fluctuations but it is also possible that cells have evolved to use fluctuations positively. How fluctuating molecular systems determine complex and flexible cellular behaviors? We are developing single-molecule analysis technologies in living cells and trying to find the answer "goes down with" everyone.
Main Research Fields
- Biology
Related Research Fields
- Complex Systems
- Biological Sciences
- Biophysics
Keywords
- Intracellular Signal Transduction
- Bioimaging
Selected Publications
Papers with an asterisk(*) are based on research conducted outside of RIKEN.
- 1.
Okamoto, K., Hibino, K., and Sako, Y.:
"In-cell single-molecule FRET measurements reveal three conformational state changes in RAF protein"
Biochim. Biophys. Acta. Gen. Subj. 1864(2), 129358 (2020). - 2.
Yanagawa, M., Hiroshima, M., Togashi, Y., Abe, M., Yamashita, T., Shichida, Y., Murata, M., Ueda, M., and Sako, Y.:
"Single-molecule diffusion-based estimation of ligand effects on G protein-coupled receptors"
Sci. Signal. 11(548), eaao1917 (2018). - 3.
Hiroshima, M., Pack, C.-G., Kaizu, K., Takahashi, K., Ueda, M., and Sako, Y.:
"Transient acceleration of epidermal growth factor receptor dynamics produces higher-order signaling clusters"
J. Mol. Biol. 430(9), 1386-1401 (2018). - 4.
Maeda, R., Sato, T., Okamoto, K., Yanagawa, M., and Sako, Y.:
"Lipid-protein interplay in dimerization of juxtamembrane domains of epidermal growth factor receptor"
Biophys. J. 114(4), 893-903 (2018). - 5.
Nakamura, Y., Umeki, N., Abe, M., and Sako, Y.:
"Mutation-specific mechanisms of hyperactivation of Noonan syndrome SOS molecules detected with single-molecule imaging in living cells"
Sci. Rep. 7(1), 14153 (2017). - 6.
Arata, Y., Hiroshima, M., Pack, C.-G., Ramanujam, R., Motegi, F., Nakazato, K., Wiseman, P. W., Sawa, H., Kobayashi, T. J., Brandão, H. B., Shibata, T., and Sako, Y.:
"Cortical polarity of the RING protein PAR-2 is maintained by exchange rate kinetics at the cortical-cytoplasm boundary"
Cell Rep. 16(8), 2156-2168 (2016). - 7.
Takanezawa, S., Morita, S.-i., Ozaki, Y., and Sako, Y.:
"Raman spectral dynamics of single cells in the early stages of growth factor stimulation"
Biophys. J. 108(9), 2148-2157 (2015). - 8.
Mouri, K., and Sako, Y.:
"Optimality conditions for cell-fate heterogeneity that maximize the effects of growth factors in PC12 cells"
PLoS Comp. Biol. 9(11), e1003320 (2013). - 9.
Hiroshima, M., Saeki, Y., Okada-Hatakeyama, M., and Sako, Y.:
"Dynamically varying interactions between heregulin and ErbB proteins detected by single-molecule analysis in living cells"
Proc. Natl. Acad. Sci. USA. 109(35), 13984-13989 (2012). - 10.
Okamoto, K., and Sako, Y.:
"Variational Bayes analysis of a photon-based hidden Markov model for single-molecule FRET trajectories"
Biophys. J. 103(6), 1315-1324 (2012).
Recent Research Results
Annual research report
Related Links
Lab Members
Principal investigator
- Yasushi Sako
- Chief Scientist
Core members
- Junichi Aikawa
- Senior Research Scientist
- Mitsuhiro Abe
- Senior Research Scientist
- Yukinobu Arata
- Senior Research Scientist
- Kenji Okamoto
- Senior Research Scientist
- Toshihiro Nagamine
- Senior Research Scientist
- Akihiro Yamamoto
- Senior Technical Scientist
- Nobuhisa Umeki
- Research Scientist
- Michio Hirosnima
- Research Scientist
- Ryo Maeda
- Research Scientist
- Masataka Yanagawa
- Research Scientist
- Ryo Yoshizawa
- Student Trainee
- Yutaro Kuwashima
- Student Trainee
- Hiromi Sato
- Technical Staff II
- Mutsumi Nakanishi
- Technical Staff II
- Toshihide Kobayashi
- Senior Visiting Scientist
- Yoshio Hirabayashi
- Senior Visiting Scientist
- Changi Back
- Visiting Scientist
- Peter Jurica
- Visiting Scientist
- Toshiko Sawai
- Assistant
Contact Information
2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Email: sako-lab [at] riken.jp