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Augmented photoswitching modulates immune signaling

Abstract

Reversible and non-invasive photoswitching of the immunosuppressive effect of a drug would be a very valuable tool for precisely regulating the immune system. Using a combination of protein borrowing and two-photon photoisomerization, we designed and synthesized derivatives of cyclosporin A. Here we demonstrate photoswitching of the local conformation within small molecules, which we used to modulate inhibitory potencies for cyclophilin, influence ternary and quaternary complex formations and regulate T-cell transcriptional activation in situ.

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Figure 1: Structures of CsA derivatives and photoswitching of 1.
Figure 2: Orthogonal switching of compound 2.

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Acknowledgements

We thank the SFB610 of the Deutsche Forschungsgemeinschaft for supporting the work and M. Heidler and I. Kunze for their excellent technical assistance.

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Authors and Affiliations

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Contributions

Y.Z. and F.E. performed and analyzed experiments. Y.Z. synthesized all CsA derivatives and measured the enzymatic activities together with F.E. F.E. designed and performed all bioassays. G.F. prepared the manuscript and planned all experiments together with Y.Z. and F.E.

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Correspondence to Gunter Fischer.

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Zhang, Y., Erdmann, F. & Fischer, G. Augmented photoswitching modulates immune signaling. Nat Chem Biol 5, 724–726 (2009). https://doi.org/10.1038/nchembio.214

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