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. Heme oxygenase 1 activity is highly inducible by its substrate heme and by various non-heme substances such as heavy metals, bromobenzene, endotoxin, oxidizing agents and UVA. Expressed at higher levels in renal cancer tissue than in normal tissue. Belongs to the heme oxygenase family. Note: This description may include information from UniProtKB.
Protein type: Cofactor and Vitamin Metabolism - porphyrin and chlorophyll; Oxidoreductase; EC 126.96.36.199
Molecular Function: signal transducer activity; protein homodimerization activity; enzyme binding; metal ion binding; phospholipase D activity; heme binding; heme oxygenase (decyclizing) activity
Biological Process: cell death; response to nicotine; cellular iron ion homeostasis; negative regulation of smooth muscle cell proliferation; positive regulation of smooth muscle cell proliferation; negative regulation of mast cell degranulation; protein kinase cascade; positive regulation of vasodilation; excretion; erythrocyte homeostasis; regulation of transcription factor activity; heme catabolic process; regulation of blood pressure; small GTPase mediated signal transduction; porphyrin metabolic process; negative regulation of mast cell cytokine production; negative regulation of neuron apoptosis; angiogenesis; regulation of transcription from RNA polymerase II promoter in response to oxidative stress; healing during inflammatory response; transmembrane transport; protein homooligomerization; positive regulation of I-kappaB kinase/NF-kappaB cascade; negative regulation of transcription factor activity; heme oxidation; cellular response to nutrient; negative regulation of leukocyte migration; regulation of angiogenesis; negative regulation of DNA binding; iron ion homeostasis; positive regulation of angiogenesis; positive regulation of chemokine biosynthetic process; DNA damage response, signal transduction resulting in induction of apoptosis; response to hydrogen peroxide; response to estrogen stimulus; endothelial cell proliferation; response to oxidative stress; smooth muscle hyperplasia; negative regulation of apoptosis
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.