The crystal structure of the trp RNA-binding attenuation protein of Bacillus subtilis solved at 1.8 Å resolution reveals a novel structural arrangement in which the eleven subunits are stabilized through eleven intersubunit β-sheets to form a β-wheel with a large central hole. The nature of the binding of L-tryptophan in clefts between adjacent β-sheets in the β-wheel suggests that this binding induces conformational changes in the flexible residues 25-33 and 49-52. It is argued that upon binding, the messenger RNA target forms a matching circle in which eleven U/GAG repeats are bound to the surface of the protein ondecamer modified by the binding of L-tryptophan.
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Antson, A., Otridge, J., Brzozowski, A. et al. The structure of trp RNA-binding attenuation protein. Nature 374, 693–700 (1995). https://doi.org/10.1038/374693a0
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DOI: https://doi.org/10.1038/374693a0
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