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Investigation by EPR and ENDOR spectroscopy of the novel 4Fe ferredoxin fromPyrococcus furiosus

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Abstract

The hyperthermophilic archaeonPyrococcus furiosus contains a four-Fe ferredoxin (Pf- Fd) that differs from most other 4Fe-Fd’s in that its [Fe4S4] cluster is anchored to protein by only three cysteinyl residues.Pf- Fd also is of interest because in its reduced form, [Fe4S4]+, the cluster exhibits bothS = 1/2 andS = 3/2 spin states. Addition of excess cyanide ion converts the cluster exclusively to anS = 1/2 state (g1 = 2.09, g2 = 1.95, g3 = 1.92), however dialysis restores the EPR signal of native reduced protein indicating that the cluster is not irreversibly altered by cyanide. Both the native protein and protein in the presence of excess cyanide ion (Pf- Fd 4Fe-CN) were investigated here using the techniques of electron paramagnetic resonance (EPR) and electron-nuclear double resonance (ENDOR) spectroscopy. In particular,Pf- Fd 4Fe-CN was investigated using13CN− and C15N− ligands.13C and15N ENDOR indicated that a single cyanide ion bound directly, with the cluster showing an unusually small contact interaction (aiso(13C)∼ −3 MHz, aiso(15N) ∼ 0). This is in contrast to cyanide bound to monomeric low-spin Fe(III)-containing proteins such as transferrin and myoglobin, for which the13C hyperfine coupling has a large isotropic component (aiso(13C) ≈ −30 MHz). This small contact interaction is not due to low spin density of Fe, as57Fe ENDOR of the singly and triply labeledPf- Fd 4FeCN isotopologs, [57FeFe3S4]+ and [Fe57Fe3S4]+, show hyperfine coupling characteristic for [Fe4S4]+ clusters, particularly for the Fe to which cyanide binds. Thus, the low spin density on13C is not due to low spin density on the Fe ion to which it binds. Further theoretical work is needed to explain the contrast between the strong electronic effect of cyanide ion binding with the low spin density on the ligand.

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Authors and Affiliations

  1. Department of Chemistry, Northwestern University, Evanston, Illinois, USA

    J. Telser, H. -I. Lee & B. M. Hoffman

  2. Department of Biochemistry and Center for Metalloenzyme Studies, University of Georgia, Athens, Georgia, USA

    E. T. Smith, H. Huang, P. Brereton & M. W. W. Adams

  3. Department of Chemistry and Center for Metalloenzyme Studies, University of Georgia, Athens, Georgia, USA

    R. C. Conover & M. K. Johnson

  4. School of Science and Mathematics, Roosevelt University, 430 S. Michigan Ave., 60605, Chicago, IL, USA

    J. Telser

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Telser, J., Lee, H.I., Smith, E.T. et al. Investigation by EPR and ENDOR spectroscopy of the novel 4Fe ferredoxin fromPyrococcus furiosus . Appl. Magn. Reson. 14, 305–321 (1998). https://doi.org/10.1007/BF03161897

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