A DFT study on the relative affinity for oxygen of the alpha and beta subunits of hemoglobin
DFT calculations are carried out on computational models of the active center of the alpha and beta subunits of hemoglobin in both its oxygenated (R) and deoxygenated (T) states. The computational models are defined by the full heme group, including all porphyrin substituents, and the four amino aci...
| Veröffentlicht in: | Journal of computational chemistry. - 1984. - 27(2006), 12 vom: 06. Sept., Seite 1446-53 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , |
| Format: | Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2006
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| Zugriff auf das übergeordnete Werk: | Journal of computational chemistry |
| Schlagworte: | Journal Article Research Support, Non-U.S. Gov't Hemoglobins Protein Subunits Oxygen S88TT14065 |
| Zusammenfassung: | DFT calculations are carried out on computational models of the active center of the alpha and beta subunits of hemoglobin in both its oxygenated (R) and deoxygenated (T) states. The computational models are defined by the full heme group, including all porphyrin substituents, and the four amino acids closer to it. The role of the protein environment is introduced by freezing the position of the alpha carbon atom of each of the four amino acids to the positions they have in the available PDB structures. Oxygen affinity is then evaluated by computing the energy difference between the optimized structures of the oxygenated and deoxygenated forms of each model. The results indicate a higher affinity of the alpha subunits over the beta ones. Analysis of the computed structures points out to the strength of the hydrogen bond between the distal histidine and the oxygen molecule as a key factor in discriminating the different systems |
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| Beschreibung: | Date Completed 15.08.2007 Date Revised 21.11.2013 published: Print Citation Status MEDLINE |
| ISSN: | 1096-987X |