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Default A two-dimensional 1H NMR study on Megasphaera elsdenii flavodoxin in the reduced stat

A two-dimensional 1H NMR study on Megasphaera elsdenii flavodoxin in the reduced state. Sequential assignments.

Related Articles A two-dimensional 1H NMR study on Megasphaera elsdenii flavodoxin in the reduced state. Sequential assignments.

Eur J Biochem. 1990 Feb 14;187(3):521-41

Authors: van Mierlo CP, Vervoort J, Müller F, Bacher A

Assignments for the 137 amino acid residues of Megasphaera elsdenii flavodoxin in the reduced state have been made using the sequential resonance assignment procedure. Several hydroxyl and sulfhydryl protons were observed at 41 degrees C at pH 8.3. Spin systems were sequentially assigned using phase-sensitive two-dimensional-correlated spectroscopy and phase-sensitive nuclear Overhauser enhancement spectroscopy. Spectra of the protein in H2O and of protein preparations either completely or partly exchanged against 2H2O were obtained. Use of the fast electron shuttle between the paramagnetic semiquinone and the diamagnetic hydroquinone state greatly simplified the NMR spectra, making it possible to assign easily the 1H resonances of amino acid residues located in the immediate neighbourhood of the isoalloxazine ring. The majority of the nuclear Overhauser effect contracts between the flavin and the apoprotein correspond to the crystal structure of the flavin domain of Clostridium MP flavodoxin, but differences are also observed. The assignments provide the basis for the structure determination of M. elsdenii flavodoxin in the reduced state as well as for assigning the resonances of the oxidized flavodoxin.

PMID: 2303055 [PubMed - indexed for MEDLINE]



Source: PubMed
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