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Lys156 (gray) of R. capsulatus ALAS coordinates the positioning of the adenosyl group of succinyl-CoA (magenta). On opposite sides of Lys156 are β-strand 134–138 and α-helix 143–150 (cyan), which are connected by a linker that contains the catalytic His142. R. capsulatus ALAS Lys156 and His142 correspond to Lys221 and His207 in mALAS2. Image created with Pymol using PDB: 2BWO.
