• USA Home
  • C8113 - Cytochrome P450 Reductase human

C8113 Sigma-Aldrich

Cytochrome P450 Reductase human

recombinant, expressed in baculovirus infected insect cells

Synonym: NADPH: Ferrihemoprotein oxidoreductase



Related Categories 1.6.x.x Acting on NAD or NADP, 1.x.x.x Oxidoreductases, Application Index, Biochemicals and Reagents, Cell Signaling Enzymes,
recombinant   expressed in baculovirus infected insect cells
specific activity activity   ≥30 U/mg
mol wt   calculated mol wt 76.5 kDa
concentration   ≥0.5 mg/mL
shipped in   dry ice
storage temp.   −70°C
Gene Information   human ... POR(5447)


General description

This human, recombinant protein is isolated from insect cells infected with a baculovirus containing the cDNA for human cytochrome P450 reductase. It is purified by affinity chromatography.


Human cytochrome P450 reductase has been used in a study to assess the biocatalytic synthesis and structure elucidation of cyclized metabolites of the deacetylase inhibitor panobinostat (LBH589). Human cytochrome P450 reductase has also been used in a study to investigate the effects of coupled motions on electrons along the human microsomal P450 chains.

The enzyme from sigma has been used in the hypoxic and oxic reductions of the anticancer prodrug, 1,2-bis(methylsulfonyl)-1-(2-chloroethyl)-2-[[1-(4-nitrophenyl)ethoxy]carbonyl]hydrazine (KS119).

NADPH-P450 reductase is a membrane-bound flavoprotein that transfers electrons from NADPH to the various isoforms of cytochrome P450. The ratio of reductase:P450 that is typically used ranges from 0.5-5:1. The enzyme contains one mole each of FAD and FMN per mole of protein.

Biochem/physiol Actions

Cytochrome P450 reductase is a membrane bound enzyme required for electron transfer from NADP to cytochrome P450 in microsomes. It can also provide electron transfer to heme oxygenase and cytochrome B5. The cytochrome P450 enzyme system is mainly involved in the detoxification of xenobiotics in the liver. It also participates in the activation of procarcinogens and the metabolism of endogeneous substrates such as steroids.

Unit Definition

One unit will cause the reduction of 1.0 μmole of cytochrome c by NADPH per minute at pH 7.4 at 37 °C.

Physical form

Supplied in a solution containing 10 mM potassium phosphate, pH 7.4, 0.1 mM EDTA, 0.5 mM DTT, 20% (v/v) glycerol

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis


Certificate of Origin

Protocols & Articles

Related Content

Enzymes & Proteins

Application Index | Enzyme Index | Substrate Index | Inhibitor Index | Cofactor Index | Lectin Index
Keywords: Cell signaling, Diagnostic, Drug discovery, Metabolomics, Molecular biology

Peer-Reviewed Papers


Related Products

Technical Service:

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Bulk Ordering & Pricing:

Need larger quantities for your development, manufacturing or research applications?