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Figure 3
(a) Crystal structure of MtMce4A39–140 with four molecules in the asymmetric unit. (b) Topology of the MtMce4A39–140 domain-swapped dimer. β-­Strands are shown as arrows and helices as cylinders. The secondary structures of chain A and chain B are shown in pink and cyan, respectively. The secondary-structure elements and residue numbers for chain B are indicated with primes. The residues after the black vertical arrow are involved in domain swapping. (c) The domain-swapped dimer residues of β5 and β5' are highlighted and shown in the inset. The 2Fo − Fc electron-density map contoured at 1.5σ is shown as a gray mesh. These residues are important for the arrangement of the domain-swapped dimer.

IUCrJ
Volume 8| Part 5| September 2021| Pages 757-774
ISSN: 2052-2525
https://doi.org/10.1107/S2052252521006199