| Structural highlights
1n45 is a 2 chain structure with sequence from Homo sapiens. This structure supersedes the now removed PDB entry 1qq8. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Ligands: | ,
| | Related: | 1qq8, 1n3u |
| Gene: | HMOX1, HO1 (Homo sapiens) |
| Activity: | Heme oxygenase, with EC number 1.14.99.3 |
| Resources: | FirstGlance, OCA, RCSB, PDBsum |
Disease
[HMOX1_HUMAN] Defects in HMOX1 are the cause of heme oxygenase 1 deficiency (HMOX1D) [MIM:614034]. A disease characterized by impaired stress hematopoiesis, resulting in marked erythrocyte fragmentation and intravascular hemolysis, coagulation abnormalities, endothelial damage, and iron deposition in renal and hepatic tissues. Clinical features include persistent hemolytic anemia, asplenia, nephritis, generalized erythematous rash, growth retardation and hepatomegaly.[1]
Function
[HMOX1_HUMAN] Heme oxygenase cleaves the heme ring at the alpha methene bridge to form biliverdin. Biliverdin is subsequently converted to bilirubin by biliverdin reductase. Under physiological conditions, the activity of heme oxygenase is highest in the spleen, where senescent erythrocytes are sequestrated and destroyed.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Heme oxygenase catalyzes the first step in the oxidative degradation of heme. The crystal structure of heme oxygenase-1 (HO-1) reported here reveals a novel helical fold with the heme sandwiched between two helices. The proximal helix provides a heme iron ligand, His 25. Conserved glycines in the distal helix near the oxygen binding site allow close contact between the helix backbone and heme in addition to providing flexibility for substrate binding and product release. Regioselective oxygenation of the alpha-meso heme carbon is due primarily to steric influence of the distal helix.
Crystal structure of human heme oxygenase-1.,Schuller DJ, Wilks A, Ortiz de Montellano PR, Poulos TL Nat Struct Biol. 1999 Sep;6(9):860-7. PMID:10467099[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Yachie A, Niida Y, Wada T, Igarashi N, Kaneda H, Toma T, Ohta K, Kasahara Y, Koizumi S. Oxidative stress causes enhanced endothelial cell injury in human heme oxygenase-1 deficiency. J Clin Invest. 1999 Jan;103(1):129-35. PMID:9884342 doi:10.1172/JCI4165
- ↑ Schuller DJ, Wilks A, Ortiz de Montellano PR, Poulos TL. Crystal structure of human heme oxygenase-1. Nat Struct Biol. 1999 Sep;6(9):860-7. PMID:10467099 doi:10.1038/12319
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