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Optogenetic control shows that kinetic proofreading regulates the activity of the T cell receptor
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Abstract
The immune system distinguishes between self and foreign antigens. The kinetic proofreading (KPR) model proposes that T cells discriminate self from foreign ligands by the different ligand binding half-lives to the T cell receptor (TCR). It is challenging to test KPR as the available experimental systems fall short of only altering the binding half-lives and keeping other parameters of the interaction unchanged. We engineered an optogenetic system using the plant photoreceptor phytochrome B (PhyB) as a ligand to selectively control the dynamics of ligand binding to the TCR by light. This opto-ligand-TCR system was combined with the unique property of PhyB to continuously cycle between the binding and non-binding states under red light, with the light intensity determining the cycling rate and thus the binding duration. Mathematical modeling of our experimental datasets showed that indeed the ligand-TCR interaction half-life is the decisive factor for activating downstream TCR signaling, substantiating KPR.
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Metadata
- Authors
- Yousefi, O. S., Günther, M., Hörner, M., Chalupsky, J., Wess, M., Brandl, S. M., Smith, R. W., Fleck, C., Kunkel, T., Zurbriggen, M. D., Höfer, T., Weber, W., & Schamel, W. W.
- Venue
- eLife
- Publisher
- eLife Sciences Publications, Ltd
- Published
- 2019-04-05
- Volume
- 8
- ISSN
- 2050-084X
- Cited by
- 117
- References
- 88
- Language
- en
- Licence
- creativecommons.org/licenses/by/4.0/ (vor)
- creativecommons.org/licenses/by/4.0/ (am)
- creativecommons.org/licenses/by/4.0/ (tdm)
- Funders
- Deutsche Forschungsgemeinschaft (EXC2189, GSC-4, EXC294, EXC81, INST 39/899-1 FUGG)
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