Fig. 3: The hydrophilic arm containing NdhV.

a The location of subunits in the hydrophilic domain. The nine NDH subunits in the hydrophilic domain are colored differently and labeled with the abbreviations of one letter (for example, letter V indicates subunit NdhV). The 4Fe–4S clusters are shown as spheres. b Overall structure of NdhV. c The binding position of NdhV. NdhV is shown in cartoon, other subunits are shown in surface mode. NdhI, NdhS, and NdhN are colored differently and labeled, whereas other subunits are shown in white. d The C-terminal helix of NdhV interacts with the hairpin loop of NdhI.