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Complete assignment of the aromatic and haem proton resonances in the cytochromes c3 isolated from Desulfovibrio baculatus strains (Norway 4, DSM 1741) and (DSM 1743) was achieved using one- and two-dimensional 1H n.m.r. Nuclear Overhauser enhancements observed between haem and aromatic resonances and between resonances due to different haems, together with the ring-current contributions to the chemical shifts of haem resonances, support the argument that the haem core architecture is conserved in the various cytochromes c3, and that the X-ray structure of the D. baculatus cytochrome c3 is erroneous. The relative orientation of the haems for both cytochromes was determined directly from n.m.r. data. The n.m.r. structures have a resolution of approximately 0.25 nm and are found to be in close agreement with the X-ray structure from D. vulgaris cytochrome c3. The proton assignments were used to relate the highest potential to a specific haem in the three-dimensional structure by monitoring the chemical-shift variation of several haem resonances throughout redox titrations followed by 1H n.m.r. The haem with highest redox potential is not the same as that in other cytochromes c3.

biochemical journal

Characterization of the structure and redox behaviour of cytochrome <i>c</i>3 from <i>Desulfovibrio baculatus</i> by 1H-nuclear-magnetic-resonance spectroscopy

Characterization of the structure and redox behaviour of cytochrome c3 from Desulfovibrio baculatus by 1H-nuclear-magnetic-resonance spectroscopy