Fig. 2: Proton transfer between Gln143 and the Mn-ligated solvent molecule WAT1.
From: Direct detection of coupled proton and electron transfers in human manganese superoxide dismutase
a Neutron structure at the active site of Mn3+SOD with magenta and orange omit |Fo|-|Fc| difference neutron scattering length density displayed at 3.5σ and 3.0σ, respectively, and light blue 2|Fo| − |Fc| density (displayed at 1.0σ). Of note, the neutron scattering length of Mn is negative. Numbers are distances in Å. b Neutron structure at the active site of Mn2+SOD with purple, green, and orange omit |Fo| − |Fc| difference neutron scattering length density displayed at 2.3σ, 2.5σ, and 3.0σ, respectively, and light blue 2|Fo| − |Fc| density (displayed at 1.0σ). Both panels are for chain B. Only one chain is shown due to high structural similarities, see Supplementary Fig. 1 for chain A. Representations of the amide and amide anions are included.
