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Figure 1
Crystal structure of MtHigA2. (a) Crystal structure of the MtHigA2 dimer in ribbon representation. The two monomers are coloured light and dark cyan. The HTH motif is highlighted in darker colours. Three positively charged side chains on the HTH motif are indicated as sticks. Potential surface charge is indicated in the background, where surfaces are coloured between −10 kcal mol−1 (red) and +10 kcal mol−1 (blue). (b) Secondary-structure diagram of the MtHigA2 dimer. The colours correspond to those in (a). (c) The three forms of the MtHigA2 crystal structure when the HTH motifs are aligned. The arrangement of the second HTH motif is diverse. The side chain of His54 moves ∼7 Å depending on the crystal form. (d) Detailed view of the dimerization interface enclosed with a dotted box in (c). Hydrogen bonds are indicated as grey dotted lines and distances are given in Å.

IUCrJ
Volume 8| Part 5| September 2021| Pages 823-832
ISSN: 2052-2525
https://doi.org/10.1107/S2052252521007715