Fig. 13.

Schematic picture of possible interaction interfaces of c-rings from different organisms. Isoprenoid quinones are shown in orange. A The c₁₄-ring from Spinacia oleracea (6TQJ) [23] and PQ-9 molecules. B The c₁₀-ring from Saccharomyces cerevisiae (4F4S) [122] and the possible UQ-6/6.8PL subunit interface. C The c₉-ring from Mycobacterium phlei (4V1H) [123] and MK-9 molecules. D The c₁₃-ring from Bacillus pseudofirmus (4CBK) [123] and MK-7 molecules. E The c₁₅-ring from Arthrospira platensis (2XQU) [124] and PQ-7 molecules.

The figure was reprinted from ref. [4]