细胞色素P450 人

Research Area: Immuno and CKS
Cytochromes are a type of protein belonging to superfamilies containing heme as a cofactor, making them hemoproteins. These proteins, also known as CYPs, serve as substrates in enzymatic reactions. The term "P450" originates from the enzyme′s maximum optical density peak at 450 nm when in its reduced state combined with carbon monoxide. Cytochromes are present in various tissues throughout the human body, with a predominant presence in intestinal and hepatic tissues.

Cytochrome P450 human has been used in aflatoxin B1 (AFB1) metabolites analysis to study its effects on AFB1-induced cytotoxicity and micronuclei formation in human hepatocyte (L-02) and human lymphoblastoid (TK6) cells. It has also been used in cell-free cytochrome P4501B1 (CYP1B1) inhibition assays.

Cytochromes play a crucial role in metabolizing a wide range of xenobiotic compounds and are engaged in diverse functions such as steroid metabolism, deactivation of drugs and procarcinogens, metabolism of fatty acids, detoxification of xenobiotic substances, and breakdown of exogenous compounds. It facilitates the oxidation of substances using iron. CYP is well-established that changes in CYP enzymes often occur as a common consequence of immune system activation following infection and inflammation. Despite the overlapping effects of cytokines, the activity of human P450s is independently regulated in infection and inflammation.

细胞色素 P450 是一个具有异质性的同工酶家族，其主要功能是氧化小分子，既是中间代谢（如脂肪酸）的功能，也是对外源化合物（药物或毒素）解毒的功能。一些亚型具有较窄的底物特异性，而另一些则是替代的。

One unit will reduce 1 nanomole of cytochrome C per minute at pH 7.4 at 37 deg C.

Solution in 100 mM potassium phosphate buffer, pH 7.4.

Microsomes containing human CYP1B1 and recombinant human NADPH-P450 reductase.

Tested for the ability to catalyze the 7-deethylation of ethoxyresorufin.