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. 2011 Feb 24;434(Pt 3):427–434. doi: 10.1042/BJ20101813

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© 2011 The Author(s) The author(s) has paid for this article to be freely available under the terms of the Creative Commons Attribution Non-Commercial Licence (http://creativecommons.org/licenses/by-nc/2.5/) which permits unrestricted non-commercial use, distribution and reproduction in any medium, provided the original work is properly cited.

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Amino acid residues are coloured according to element. The amino acid chain and electron-density maps are shown from the apo-TRAP structure only. Tryptophan is shown in orange and is from the tryptophan-bound TRAP structure. The 2F_o−F_c electron-density map is contoured at 1.0 σ. Note the lack of electron density for tryptophan.