( c ) Overlay of X-ray electron density map (gray surface, contour level 1.9) with an EM envelope of Yarrowia lipolytica complex I (gray mesh) and the X-ray structure of bacterial Thermus thermophilus... complex I (PDB file 4HEA); central subunits: NDUFS2 subunit (NQO4, blue; N-terminal β-sheet highlighted in yellow), NDUFS7 subunit (NQO6, cyan), NDUFS8 subunit (NQO9, orange), NDUFS3 subunit (NQO5, hot pink), loop connecting helices 1 and 2 of subunit ND3 (NQO7, red); structure of ACP from E. coli (PDB file 2FAE, pink; decanoyl phosphopantetheine, yellow stick representation) fitted to electron density (magenta); please compare the original figure of the publication [ 25 ].