Fig. 4

Detailed view of the complex I variation A10398G (T114A). T114 is located at the surface of complex I within the mitochondrial DNA encoded MT-ND3 subunit. MT-ND3 is shown in purple and MT-ND1, an adjacent subunit, in yellow. The wild type T114 is shown in orange as sticks and spheres (a & c, respectively) and the mutant A114 is shown in red (b & d). Alanine is non-polar and smaller than threonine in size meaning the change is likely to result in the loss of hydrogen bonds (dotted line) with the D283 residue of MT-ND1, and therefore affect the association of the two subunits and consequently the stability of complex I