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  • Title: Nitrogenase from Klebsiella pneumoniae. An e.p.r. signal observed during enzyme turnover under ethylene is associated with the iron-molybdenum cofactor.
    Author: Hawkes TR, Lowe DJ, Smith BE.
    Journal: Biochem J; 1983 May 01; 211(2):495-7. PubMed ID: 6307282.
    Abstract:
    During turnover at 10 degrees C at pH 7.4 in the presence of ethylene, the MoFe protein of Klebsiella pneumoniae nitrogenase (Kp 1) exhibited an electron-paramagnetic-resonance signal with g-values at 2.12, 1.998 and 1.987. 57Fe isotopic substitution demonstrated that this signal arose from the Kp 1 FeMo-cofactor in an S = 1/2 spin state.
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