Proton NMR Characterization of the Ferryl Group in Model Heme Complexes and Hemoproteins: Evidence for the FeIV=O Group in Ferryl Myoglobin and Compound II of Horseradish Peroxidase
The proton NMR spectra of model porphyrin complexes possessing the ferryl, FeIV=O, group are reported and assigned. The only resonance shifted well outside the diamagnetic region is that of the meso protons. Moreover, these model compounds exhibit hyperfine shift patterns (particularly for the subst...
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1983
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Online Access: | https://digitalcommons.lsu.edu/chemistry_pubs/2058 https://doi.org/10.1021/ja00342a022 |
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ftlouisianastuir:oai:digitalcommons.lsu.edu:chemistry_pubs-3059 2023-06-11T04:17:07+02:00 Proton NMR Characterization of the Ferryl Group in Model Heme Complexes and Hemoproteins: Evidence for the FeIV=O Group in Ferryl Myoglobin and Compound II of Horseradish Peroxidase La Mar, Gerd N. de Ropp, Jeffrey S. Latos-Grazynski, Lechoslaw Balch, Alan L. Johnson, R. B. Smith, Kevin M. Parish, Daniel W. Cheng, Ru Jen 1983-01-01T08:00:00Z https://digitalcommons.lsu.edu/chemistry_pubs/2058 https://doi.org/10.1021/ja00342a022 unknown LSU Digital Commons https://digitalcommons.lsu.edu/chemistry_pubs/2058 doi:10.1021/ja00342a022 Faculty Publications text 1983 ftlouisianastuir https://doi.org/10.1021/ja00342a022 2023-05-28T18:15:37Z The proton NMR spectra of model porphyrin complexes possessing the ferryl, FeIV=O, group are reported and assigned. The only resonance shifted well outside the diamagnetic region is that of the meso protons. Moreover, these model compounds exhibit hyperfine shift patterns (particularly for the substituents found in natural porphyrins) that are different from those found for other characterized iron-porphyrin complexes. Deuterium labeling of the meso position of hemin reconstituted into sperm whale myoglobin and horseradish peroxidase reveals that both the hydrogen peroxide treated myoblobin (ferryl myoglobin) and horseradish peroxidase compound II exhibit only meso H resonances with significant hyperfine shift and that these shifts are essentially the same as those found in the low-spin FeIV=0 model complexes. Hence, the 1H NMR data can be taken as evidence for the presence of the ferryl group at the active site of both ferryl myoglobin and compound II of horseradish peroxidase. © 1983, American Chemical Society. All rights reserved. Text Sperm whale LSU Digital Commons (Louisiana State University) Journal of the American Chemical Society 105 4 782 787 |
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LSU Digital Commons (Louisiana State University) |
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description |
The proton NMR spectra of model porphyrin complexes possessing the ferryl, FeIV=O, group are reported and assigned. The only resonance shifted well outside the diamagnetic region is that of the meso protons. Moreover, these model compounds exhibit hyperfine shift patterns (particularly for the substituents found in natural porphyrins) that are different from those found for other characterized iron-porphyrin complexes. Deuterium labeling of the meso position of hemin reconstituted into sperm whale myoglobin and horseradish peroxidase reveals that both the hydrogen peroxide treated myoblobin (ferryl myoglobin) and horseradish peroxidase compound II exhibit only meso H resonances with significant hyperfine shift and that these shifts are essentially the same as those found in the low-spin FeIV=0 model complexes. Hence, the 1H NMR data can be taken as evidence for the presence of the ferryl group at the active site of both ferryl myoglobin and compound II of horseradish peroxidase. © 1983, American Chemical Society. All rights reserved. |
format |
Text |
author |
La Mar, Gerd N. de Ropp, Jeffrey S. Latos-Grazynski, Lechoslaw Balch, Alan L. Johnson, R. B. Smith, Kevin M. Parish, Daniel W. Cheng, Ru Jen |
spellingShingle |
La Mar, Gerd N. de Ropp, Jeffrey S. Latos-Grazynski, Lechoslaw Balch, Alan L. Johnson, R. B. Smith, Kevin M. Parish, Daniel W. Cheng, Ru Jen Proton NMR Characterization of the Ferryl Group in Model Heme Complexes and Hemoproteins: Evidence for the FeIV=O Group in Ferryl Myoglobin and Compound II of Horseradish Peroxidase |
author_facet |
La Mar, Gerd N. de Ropp, Jeffrey S. Latos-Grazynski, Lechoslaw Balch, Alan L. Johnson, R. B. Smith, Kevin M. Parish, Daniel W. Cheng, Ru Jen |
author_sort |
La Mar, Gerd N. |
title |
Proton NMR Characterization of the Ferryl Group in Model Heme Complexes and Hemoproteins: Evidence for the FeIV=O Group in Ferryl Myoglobin and Compound II of Horseradish Peroxidase |
title_short |
Proton NMR Characterization of the Ferryl Group in Model Heme Complexes and Hemoproteins: Evidence for the FeIV=O Group in Ferryl Myoglobin and Compound II of Horseradish Peroxidase |
title_full |
Proton NMR Characterization of the Ferryl Group in Model Heme Complexes and Hemoproteins: Evidence for the FeIV=O Group in Ferryl Myoglobin and Compound II of Horseradish Peroxidase |
title_fullStr |
Proton NMR Characterization of the Ferryl Group in Model Heme Complexes and Hemoproteins: Evidence for the FeIV=O Group in Ferryl Myoglobin and Compound II of Horseradish Peroxidase |
title_full_unstemmed |
Proton NMR Characterization of the Ferryl Group in Model Heme Complexes and Hemoproteins: Evidence for the FeIV=O Group in Ferryl Myoglobin and Compound II of Horseradish Peroxidase |
title_sort |
proton nmr characterization of the ferryl group in model heme complexes and hemoproteins: evidence for the feiv=o group in ferryl myoglobin and compound ii of horseradish peroxidase |
publisher |
LSU Digital Commons |
publishDate |
1983 |
url |
https://digitalcommons.lsu.edu/chemistry_pubs/2058 https://doi.org/10.1021/ja00342a022 |
genre |
Sperm whale |
genre_facet |
Sperm whale |
op_source |
Faculty Publications |
op_relation |
https://digitalcommons.lsu.edu/chemistry_pubs/2058 doi:10.1021/ja00342a022 |
op_doi |
https://doi.org/10.1021/ja00342a022 |
container_title |
Journal of the American Chemical Society |
container_volume |
105 |
container_issue |
4 |
container_start_page |
782 |
op_container_end_page |
787 |
_version_ |
1768375957741109248 |