Fig. 2: Comparison of transmembrane subunit structures between S. cerevisiae and S. scrofa.

a The alignment of ScSDH with S. scrofa SDH (Type C, PDB ID 1ZOY) in front view and top view. b Demonstration of heme-related amino acids in ScSDH with SsSDH. In SsSDH, D-102His and C-127His interact with heme, while in ScSDH, the allelic amino acids change to D-108Tyr and C-156His. c Top view of ScSDH and SsSDH. SDHC and SDHD alignment with surface representation. Sc, S. cerevisiae; Ss, S. scrofa. All subunits are color-coded. SDHC subunits are colored in green (Sc) and ice blue (Ss); SDHD subunits are colored in orange (Sc) and pink (Ss). PE and Heme are shown as gray stick.