EPR SPECTROSCOPIC CHARACTERIZATION OF AN IRON ONLY NITROGENASE - S = 3/2 SPECTRUM OF COMPONENT-1 ISOLATED FROM RHODOBACTER-CAPSULATUS

Müller A, Schneider K, Knuttel K, Hagen WR (1992)
FEBS LETTERS 303(1): 36-40.

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Abstract
The alternative nitrogenase of Rhodobacter capsulatus, isolated from a nifHDK deletion mutant, has been purified to near homogeneity and identified as an 'iron only' nitrogenase. The dithionite-reduced component 1 ('FeFe protein') of this enzyme showed an EPR spectrum consisting of two components: a minor S = 1/2 signal at g = 1.93 and a very characteristic S = 3/2 signal of near-stoichiometric intensity at g = 5.44. This resonance is very close to the highest possible g value (g = 5.46) for the coinciding two intradoublet subspectra of an S = 3/2 system of maximal rhombicity (E/D = 0.33). The deviation from axial symmetry (increasing E/D) correlates with the stability, activity and substrate selectivity of the different (Mo, V, Fe) nitrogenases.
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Müller A, Schneider K, Knuttel K, Hagen WR. EPR SPECTROSCOPIC CHARACTERIZATION OF AN IRON ONLY NITROGENASE - S = 3/2 SPECTRUM OF COMPONENT-1 ISOLATED FROM RHODOBACTER-CAPSULATUS. FEBS LETTERS. 1992;303(1):36-40.
Müller, A., Schneider, K., Knuttel, K., & Hagen, W. R. (1992). EPR SPECTROSCOPIC CHARACTERIZATION OF AN IRON ONLY NITROGENASE - S = 3/2 SPECTRUM OF COMPONENT-1 ISOLATED FROM RHODOBACTER-CAPSULATUS. FEBS LETTERS, 303(1), 36-40.
Müller, A., Schneider, K., Knuttel, K., and Hagen, W. R. (1992). EPR SPECTROSCOPIC CHARACTERIZATION OF AN IRON ONLY NITROGENASE - S = 3/2 SPECTRUM OF COMPONENT-1 ISOLATED FROM RHODOBACTER-CAPSULATUS. FEBS LETTERS 303, 36-40.
Müller, A., et al., 1992. EPR SPECTROSCOPIC CHARACTERIZATION OF AN IRON ONLY NITROGENASE - S = 3/2 SPECTRUM OF COMPONENT-1 ISOLATED FROM RHODOBACTER-CAPSULATUS. FEBS LETTERS, 303(1), p 36-40.
A. Müller, et al., “EPR SPECTROSCOPIC CHARACTERIZATION OF AN IRON ONLY NITROGENASE - S = 3/2 SPECTRUM OF COMPONENT-1 ISOLATED FROM RHODOBACTER-CAPSULATUS”, FEBS LETTERS, vol. 303, 1992, pp. 36-40.
Müller, A., Schneider, K., Knuttel, K., Hagen, W.R.: EPR SPECTROSCOPIC CHARACTERIZATION OF AN IRON ONLY NITROGENASE - S = 3/2 SPECTRUM OF COMPONENT-1 ISOLATED FROM RHODOBACTER-CAPSULATUS. FEBS LETTERS. 303, 36-40 (1992).
Müller, Achim, Schneider, Klaus, Knuttel, K, and Hagen, W. R. “EPR SPECTROSCOPIC CHARACTERIZATION OF AN IRON ONLY NITROGENASE - S = 3/2 SPECTRUM OF COMPONENT-1 ISOLATED FROM RHODOBACTER-CAPSULATUS”. FEBS LETTERS 303.1 (1992): 36-40.
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