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. 2020 Jan 31;76(Pt 2):166–175. doi: 10.1107/S2059798320000212

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© Michalska et al. 2020

This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.

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Details of the SpTrpA active site. The active site of SpTrpA, chain C (yellow) and chain D (green), including the acetate ion (ACY; green) superposed with (a) chain A of the SpTrpAB structure (PDB entry 5kin; blue), (b) chain A of the StTrpA structure (PDB entry 1wbj; blue) including the sn-glycerol-3-phosphate ligand (G3P; blue), with water molecules from the StTrpA structure shown as red spheres, and (c) chain A of the MtTrpAB structure (PDB entry 5tcf; blue) including the formic acid and malonate ligands (FMT and MLI; blue), with water molecules from the MtTrpAB structure shown as red spheres. Selected hydrogen bonds are marked as yellow dashes. A water molecule from the present SpTrpA structure is shown as a pink sphere.