Citation:

Dantas, JM, Saraiva IH, Morgado L, Silva MA, Schiffer M, Salgueiro CA, Louro RO.  2011.  Orientation of the axial ligands and magnetic properties of the hemes in the cytochromec7 family from Geobacter sulfurreducens determined by paramagnetic NMR. Dalton Transactions. 40(47):12713-12718.

Abstract:

Geobacter sulfurreducens is a sediment bacterium that contains a large number of multiheme cytochromes. The family of five c7 triheme periplasmic cytochromes from Geobacter sulfurreducens shows structural diversity of the heme core. Structural characterization of the relative orientation of the axial ligands of these proteins by 13C-paramagnetic NMR was carried out. The structures in solution were compared with those obtained by X-ray crystallography. For some hemes significant differences exist between the two methods such that orientation of the magnetic axes obtained from NMR data and the orientation taken from the X-ray coordinates differ. The results allowed the orientation of the magnetic axes to be defined confidently with respect to the heme frame in solution, a necessary step for the use of paramagnetic constraints to improve the complete solution structure of these proteins.

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