Mechanical coupling in the nitrogenase complex
Fig 1
Ribbon representation of the crystal structure of the ATP-bound nitrogenase complex (PDB ID: 2AFK).
Fe1, red; Fe2, yellow; α1β1 unit of MoFe, blue; α2β2 unit of MoFe, green. The ADP-bound complex (PDB ID: 2AFI [I]) shown in white, is aligned to the ATP-bound complex on the MoFe protein. In the ATP-bound complex, the P-loop (cyan), switch I region (orange) and switch II region (magenta) are highlighted in Fe2, and the ATP analogues (AMPPCP), [4Fe-4S] clusters, P-clusters and FeMo-co are shown in spheres.