Proton NMR studies of oxidized high-potential iron protein from Chromatium vinosum. Nuclear Overhauser effect measurements

1H nuclear Overhauser effect experiments on the isotropically shifted signals of oxidized Chromatium vinosum HiPIP have been used to identify the four beta-CH2 geminal couples of the cysteine ligands. A partial assignment to individual residues has been proposed from a computer graphics analysis of the X-ray structure. Tentative assignments of other resonances are discussed.