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• W1987015191 startingPage "83" @default.
• W1987015191 abstract "This paper reviews recent findings on how the second coordination sphere of heme proteins fine-tunes the properties of the heme active site via hydrogen bonding. This insight is obtained from low-temperature magnetic circular dichroism (MCD) spectroscopy. In the case of high-spin ferric hemes, MCD spectroscopy allows for the identification of a multitude of charge-transfer (CT) transitions. Using optically-detected magnetic saturation curves, out-of-plane polarized CT transitions between the heme and its axial ligand(s) can be identified. In the case of ferric Cytochrome P450cam, the corresponding S(σ)→Fe(III) CT transition can be used as a probe for the {Fe(III)-axial ligand} interaction, indicating that the hydrogen bonding network of the proximal Cys only plays a limited role for fine-tuning the Fe(III)-S(Cys) interaction. In the case of high-spin ferrous hemes with axial His/imidazole coordination, our MCD-spectroscopic investigations have uncovered a direct correlation between the strength of the hydrogen bond to the proximal imidazole ligand and the ground state of the complexes. With neutral imidazole coordination, the doubly occupied d-orbital of high-spin iron(II) is of d(π) character, located orthogonal to the heme plane. As the strength of the hydrogen bond increases, this orbital rotates into the heme plane, changing the ground state of the complex." @default.
• W1987015191 created "2016-06-24" @default.
• W1987015191 creator A5011061327 @default.
• W1987015191 date "2012-05-01" @default.
• W1987015191 modified "2023-09-25" @default.
• W1987015191 title "Elucidating second coordination sphere effects in heme proteins using low-temperature magnetic circular dichroism spectroscopy" @default.
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• W1987015191 doi "https://doi.org/10.1016/j.jinorgbio.2012.02.033" @default.
• W1987015191 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22516139" @default.
• W1987015191 hasPublicationYear "2012" @default.
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