Overview
Human heme oxygenase (HO) is a family of enzymes critical for heme metabolism, with three known isoforms: HO-1 (inducible), HO-2 (constitutive), and HO-3 (poorly characterized). HO catalyzes the rate-limiting step in heme degradation, producing biliverdin (later converted to bilirubin), carbon monoxide (a signaling molecule), and free iron. HO-1, in particular, is upregulated under oxidative stress and serves as a cytoprotective agent. First identified in the 1960s, HO enzymes are now recognized for their roles beyond heme catabolism, including modulation of inflammation, angiogenesis, and cellular homeostasis. Their therapeutic potential is being explored in conditions like atherosclerosis, neurodegenerative diseases, and organ transplantation.
Physical and Chemical Properties
HO enzymes are membrane-associated proteins localized primarily in the endoplasmic reticulum. HO-1 and HO-2 share ~40% sequence homology but differ in regulation: HO-1 is induced by stressors like heavy metals or hypoxia, while HO-2 is constitutively expressed in tissues like the brain and testes. Both require NADPH-cytochrome P450 reductase as an electron donor for activity. The enzymes exhibit optimal activity at physiological pH (7.4) and temperatures (37°C). Their stability depends on storage conditions, with lyophilized forms retaining activity longer than liquid preparations. Activity assays typically measure biliverdin production spectrophotometrically at 650-670 nm.
Main Applications
In research, HO enzymes are used to study oxidative stress pathways, particularly in cardiovascular and neurodegenerative models. HO-1 inducers (e.g., cobalt protoporphyrin) are investigated for their anti-inflammatory effects in autoimmune diseases. The carbon monoxide produced by HO activity is also studied for its vasodilatory properties. Industrially, recombinant HO enzymes are employed in biochemical kits for heme quantification. Emerging applications include bioengineering of HO variants for improved catalytic efficiency in therapeutic contexts, such as mitigating ischemia-reperfusion injury in transplanted organs.
Safety and Storage
While HO enzymes are not classified as hazardous, standard laboratory precautions apply. Use gloves and eye protection when handling powders or concentrated solutions. Avoid inhalation of lyophilized material. Spills should be cleaned with water and detergent. For storage, aliquot enzyme solutions to minimize freeze-thaw cycles. Lyophilized proteins are stable at -20°C for 1-2 years; reconstituted solutions should be used within weeks when kept at 4°C. Always verify activity after prolonged storage via control assays.
B2B Procurement Guide
When sourcing HO enzymes, prioritize suppliers providing certificates of analysis (CoA) with purity (>90% by SDS-PAGE) and specific activity (units/mg). Recombinant human HO-1 (from E. coli or baculovirus systems) is most commonly available. For isoform-specific studies, confirm absence of cross-contamination via Western blot. Bulk orders (10+ mg) may qualify for discounts of 15-30%. Lead times vary: 2-4 weeks for catalog items, longer for custom expressions. Consider regulatory needs if intended for therapeutic development—opt for GMP-grade materials in such cases.
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