5KDQ
Deoxyhemoglobin in Complex with an Aryloxyalkanoic acid
Summary for 5KDQ
| Entry DOI | 10.2210/pdb5kdq/pdb |
| Descriptor | Hemoglobin subunit alpha, Hemoglobin subunit beta, PROTOPORPHYRIN IX CONTAINING FE, ... (6 entities in total) |
| Functional Keywords | hemoglobin, sickle cell disease, allosteric effector, aryloxyalkanoic, oxygen transport |
| Biological source | Homo sapiens (Human) More |
| Total number of polymer chains | 4 |
| Total formula weight | 65003.67 |
| Authors | Ahmed, M.H.,Omar, A.M.,Safo, M.K. (deposition date: 2016-06-08, release date: 2016-06-22, Last modification date: 2023-09-27) |
| Primary citation | Omar, A.M.,Mahran, M.A.,Ghatge, M.S.,Bamane, F.H.,Ahmed, M.H.,El-Araby, M.E.,Abdulmalik, O.,Safo, M.K. Aryloxyalkanoic Acids as Non-Covalent Modifiers of the Allosteric Properties of Hemoglobin. Molecules, 21:-, 2016 Cited by PubMed Abstract: Hemoglobin (Hb) modifiers that stereospecifically inhibit sickle hemoglobin polymer formation and/or allosterically increase Hb affinity for oxygen have been shown to prevent the primary pathophysiology of sickle cell disease (SCD), specifically, Hb polymerization and red blood cell sickling. Several such compounds are currently being clinically studied for the treatment of SCD. Based on the previously reported non-covalent Hb binding characteristics of substituted aryloxyalkanoic acids that exhibited antisickling properties, we designed, synthesized and evaluated 18 new compounds (KAUS II series) for enhanced antisickling activities. Surprisingly, select test compounds showed no antisickling effects or promoted erythrocyte sickling. Additionally, the compounds showed no significant effect on Hb oxygen affinity (or in some cases, even decreased the affinity for oxygen). The X-ray structure of deoxygenated Hb in complex with a prototype compound, KAUS-23, revealed that the effector bound in the central water cavity of the protein, providing atomic level explanations for the observed functional and biological activities. Although the structural modification did not lead to the anticipated biological effects, the findings provide important direction for designing candidate antisickling agents, as well as a framework for novel Hb allosteric effectors that conversely, decrease the protein affinity for oxygen for potential therapeutic use for hypoxic- and/or ischemic-related diseases. PubMed: 27529207DOI: 10.3390/molecules21081057 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.15 Å) |
Structure validation
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