Fig. 1 Crystal structure of the MMOH-MMOD complex. Crystal structure of the MMOH-MMOD complex. (A) Schematic overview of the sMMO operon in M. sporium strain 5. (B) Front and top views of the MMOH-MMOD complex. MMOH is shown using a cartoon model (α subunit, blue; β subunit, green; and γ subunit, orange); MMOD is colored yellow, and the orange balls represent di-irons. (C) Front view of the MMOH-MMOD complex. MMOH is shown using a surface representation model (white), and MMOD (yellow) is shown in cartoon form. Red dot marks the location of the di-iron center in MMOH. (D) MMOD contains a ββββα-fold, which is shown in cartoon form. Illustrations of the protein structure used in all figures were generated with PyMOL (DeLano Scientific LLC). Hanseong Kim et al. Sci Adv 2019;5:eaax0059 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).