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• W2025937464 abstract "Hemophore HasA is a 19 kDa iron(III) hemoprotein that participates in the shuttling of heme to a specific membrane receptor. In HasA, heme iron has an original coordination environment with a His/Tyr pair as axial ligands. Recently developed two-dimensional protonless 13C-detected experiments provide the sequence-specific assignment of all but three protein residues in the close proximity of the paramagnetic center, thus overcoming limitations due to the short relaxation times induced by the presence of the iron(III) center. Mono-dimensional 13C and 15N experiments tailored for the detection of paramagnetic signals allow the identification of resonances of the axial ligands. These experiments are used to characterize the conformational features and the electronic structure of the heme iron(III) environment. The good complementarity among 1H-, 13C-, and 15N-detected experiments is highlighted. A thermal high-spin/low-spin equilibrium is observed and is related to a modulation of the strength of the coordination bond between the iron and the Tyr74 axial ligand. The key role of a neighboring residue, His82, for the stability of the axial coordination and its involvement in the heme delivery to the receptor is discussed." @default.
• W2025937464 created "2016-06-24" @default.
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• W2025937464 date "2005-12-08" @default.
• W2025937464 modified "2023-10-02" @default.
• W2025937464 title "Direct-Detected ¹³C NMR to Investigate the Iron(III) Hemophore HasA" @default.
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• W2025937464 doi "https://doi.org/10.1021/ja054902h" @default.
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