1xk0
Crystal Structures of the G139A, G139A-NO and G143H Mutants of Human Heme Oxygenase-1Crystal Structures of the G139A, G139A-NO and G143H Mutants of Human Heme Oxygenase-1
DiseaseDisease
[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]
FunctionFunction
[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.
About this StructureAbout this Structure
1xk0 is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA.
See AlsoSee Also
ReferenceReference
- ↑ Lad L, Koshkin A, de Montellano PR, Poulos TL. Crystal structures of the G139A, G139A-NO and G143H mutants of human heme oxygenase-1. A finely tuned hydrogen-bonding network controls oxygenase versus peroxidase activity. J Biol Inorg Chem. 2005 Mar;10(2):138-46. Epub 2005 Feb 3. PMID:15690204 doi:http://dx.doi.org/10.1007/s00775-004-0620-6
- ↑ 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