Abstract
Retinal arrestin is the essential protein for the termination of the light response in vertebrate rod outer segments. It plays an important role in quenching the light-induced enzyme cascade by its ability to bind to phosphorylated light-activated rhodopsin (P-Rh*). Arrestins are found in various G-protein-coupled amplification cascades. Here we report on the three-dimensional structure of bovine arrestin (relative molecular mass, 45,300) at 3.3 Å resolution. The crystal structure comprises two domains of antiparallel β-sheets connected through a hinge region and one short α-helix on the back of the amino-terminal fold. The binding region for phosphorylated light-activated rhodopsin is located at the N-terminal domain, as indicated by the docking of the photoreceptor to the three-dimensional structure of arrestin. This agrees with the interpretation of binding studies on partially digested and mutated arrestin.
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Acknowledgements
We thank A. Cousin and R. Esser for the arrestin protein preparation from bovine eyes; L. A. Donoso for the arrestin antibodies; U. B. Kaupp for continuous support of the project; K.-P. Hofmann and M. J. Lohse for helpful discussions. This work was funded by a grant from the Deutsche Forschungsgemeinschaft.
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Granzin, J., Wilden, U., Choe, HW. et al. X-ray crystal structure of arrestin from bovine rod outer segments. Nature 391, 918–921 (1998). https://doi.org/10.1038/36147
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DOI: https://doi.org/10.1038/36147
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