Binding of histidine in the (Cys)3(His)1-coordinated [2Fe-2S] cluster of human mitoNEET.

Journal of the American Chemical Society
Michelle M DicusStefan Stoll

Abstract

Human mitoNEET is a homodimeric iron-sulfur protein located in the outer mitochondrial membrane with unknown function, but which is known to interact with thiazolidinedione diabetes drugs. Each monomer houses a [2Fe-2S] cluster with an unusual (Cys)(3)(His)(1) ligation. The His ligand is important for enabling cluster release and for tuning the redox potential. We use multifrequency (X-, Ka-, and Q-band) and multitechnique (continuous-wave, electron spin-echo envelope modulation (ESEEM), pulsed electron-nuclear double resonance (ENDOR), and hyperfine sublevel correlation (HYSCORE)) electron paramagnetic resonance spectroscopy to investigate the cluster in its paramagnetic reduced [Fe(2+)Fe(3+)] (S = 1/2) state. It has a rhombic g tensor (2.007, 1.937, 1.897) with an average g value of 1.947 that falls between those of Rieske-type and ferredoxin-type [2Fe-2S] clusters. Simulation and least-squares fitting of orientation-selective Ka- and Q-band ENDOR, 1D ESEEM, and HYSCORE spectra of (14)N and (15)N-labeled mitoNEET yield the principal values and orientations of both the hyperfine tensor ((14)N, A(iso) = -6.25 MHz, T = -0.94 MHz) and the quadrupolar tensor (e(2)Qq/h = -2.47 MHz, eta = 0.38) of the ligating histidine nitrogen N(d...Continue Reading

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