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Cited by 349

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Full characterization of GPCR monomer–dimer dynamic equilibrium by single molecule imaging

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Kasai, Rinshi S., Suzuki, Kenichi G. N., Prossnitz, Eric R., Koyama-Honda, Ikuko, Nakada, Chieko, Fujiwara, Takahiro K., Kusumi, Akihiro·2011·Journal of Cell Biology

Abstract

Receptor dimerization is important for many signaling pathways. However, the monomer–dimer equilibrium has never been fully characterized for any receptor with a 2D equilibrium constant as well as association/dissociation rate constants (termed super-quantification). Here, we determined the dynamic equilibrium for the N-formyl peptide receptor (FPR), a chemoattractant G protein–coupled receptor (GPCR), in live cells at 37°C by developing a single fluorescent-molecule imaging method. Both before and after liganding, the dimer–monomer 2D equilibrium is unchanged, giving an equilibrium constant of 3.6 copies/µm2, with a dissociation and 2D association rate constant of 11.0 s−1 and 3.1 copies/µm2s−1, respectively. At physiological expression levels of ∼2.1 receptor copies/µm2 (∼6,000 copies/cell), monomers continually convert into dimers every 150 ms, dimers dissociate into monomers in 91 ms, and at any moment, 2,500 and 3,500 receptor molecules participate in transient dimers and monomers, respectively. Not only do FPR dimers fall apart rapidly, but FPR monomers also convert into dimers very quickly.

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Crossref · 10.1083/jcb.201009128

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Metadata

Authors
Kasai, R. S., Suzuki, K. G. N., Prossnitz, E. R., Koyama-Honda, I., Nakada, C., Fujiwara, T. K., & Kusumi, A.
Venue
Journal of Cell Biology
Published
2011-02-07
Volume
192
Issue
3
Pages
463-480
ISSN
  • 0021-9525 (ISSN-L)
  • 1540-8140
OpenAlex
W2025951927
Cited by
349
References
60
FWCI
13.52
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Full characterization of GPCR monomer–dimer dynamic equilibrium by single molecule imaging. https://app.cochat.ai/papers/10.1083/jcb.201009128
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Kasai, R. S., Suzuki, K. G. N., Prossnitz, E. R., Koyama-Honda, I., Nakada, C., Fujiwara, T. K., & Kusumi, A. (2011). Full characterization of GPCR monomer–dimer dynamic equilibrium by single molecule imaging. Journal of Cell Biology. https://doi.org/10.1083/jcb.201009128

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