Date published: 2026-4-6

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CYPOR Inhibitors

Cytochrome P450 oxidoreductase (CYPOR) is a critical enzyme that serves as the electron donor for all microsomal cytochrome P450 enzymes, which are involved in the metabolism of a vast array of endogenous and exogenous compounds, including drugs, toxins, and steroids. The function of CYPOR is essential for the catalytic activity of cytochrome P450 enzymes, facilitating the transfer of electrons from NADPH to P450s, thereby enabling the oxidative metabolism of substrates. This process is crucial for the biosynthesis of steroid hormones, the metabolism of fatty acids, and the detoxification of foreign chemicals. Through its support of P450 enzymes, CYPOR plays a significant role in maintaining physiological homeostasis, influencing drug metabolism, and modulating the bioactivation and clearance of potentially harmful compounds. The inhibition of CYPOR can profoundly impact the cytochrome P450-mediated metabolism, potentially leading to altered pharmacokinetics of drugs, accumulation of toxic substances, and disruptions in the synthesis of critical hormones. Inhibition may occur through various mechanisms, including direct interaction with inhibitors that bind to the CYPOR active site, thereby blocking electron transfer to P450 enzymes. Alternatively, post-translational modifications or genetic mutations in CYPOR can impair its structural integrity or function, diminishing its electron transfer efficiency. Furthermore, certain environmental factors, such as exposure to specific chemicals or changes in cellular redox status, can also modulate CYPOR activity indirectly, affecting its ability to support P450 enzymes. Understanding the mechanisms of CYPOR inhibition is critical for elucidating the factors that influence P450 enzyme activity, which has significant implications for drug metabolism, toxicology, and the pathophysiology of diseases associated with metabolic dysregulation.

Items 1 to 10 of 12 total

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Product NameCAS #Catalog #QUANTITYPriceCitationsRATING

7-Ethoxyresorufin

5725-91-7sc-200606
sc-200606A
2 mg
10 mg
$138.00
$270.00
6
(1)

7-Ethoxyresorufin serves as a selective substrate for cytochrome P450 enzymes, particularly CYP1A1. Its unique structure allows for efficient electron transfer during metabolic reactions, leading to the formation of fluorescent metabolites. The compound exhibits distinct reaction kinetics, with a rapid conversion rate that highlights its sensitivity to enzyme activity. Additionally, its hydrophilic and lipophilic balance enhances membrane permeability, influencing its bioavailability and interaction with various biological systems.

Amodiaquine

86-42-0sc-207282
10 mg
$342.00
1
(1)

Amodiaquine is a direct inhibitor of CYPOR, specifically interfering with its electron transfer function. It disrupts the electron transport chain by binding to CYPOR and preventing the efficient transfer of electrons from NADPH to cytochrome P450 enzymes.

Fluconazole

86386-73-4sc-205698
sc-205698A
500 mg
1 g
$54.00
$84.00
14
(1)

Fluconazole is a direct inhibitor of CYPOR, acting on its electron transfer function. By binding to CYPOR, it interferes with the transfer of electrons from NADPH to cytochrome P450 enzymes, particularly those involved in the synthesis of sterols.

Fenofibrate

49562-28-9sc-204751
5 g
$41.00
9
(1)

Fenofibrate is a direct inhibitor of CYPOR, targeting its electron transfer function. It interferes with the transfer of electrons from NADPH to cytochrome P450 enzymes, leading to a reduction in their enzymatic activity.

Erythromycin

114-07-8sc-204742
sc-204742A
sc-204742B
sc-204742C
5 g
25 g
100 g
1 kg
$57.00
$245.00
$831.00
$1331.00
4
(3)

Erythromycin is a direct inhibitor of CYPOR, specifically affecting its electron transfer activity. By binding to CYPOR, it disrupts the flow of electrons from NADPH to cytochrome P450 enzymes, leading to a decrease in their catalytic function.

Clotrimazole

23593-75-1sc-3583
sc-3583A
100 mg
1 g
$42.00
$57.00
6
(2)

Clotrimazole is a direct inhibitor of CYPOR, acting on its electron transfer function. It interferes with the transfer of electrons from NADPH to cytochrome P450 enzymes, particularly those involved in the synthesis of sterols.

17-AAG

75747-14-7sc-200641
sc-200641A
1 mg
5 mg
$67.00
$156.00
16
(2)

17-AAG is a direct inhibitor of CYPOR, targeting its electron transfer function. It disrupts the flow of electrons from NADPH to cytochrome P450 enzymes, leading to a decrease in their catalytic activity.

Trimethoprim

738-70-5sc-203302
sc-203302A
sc-203302B
sc-203302C
sc-203302D
5 g
25 g
250 g
1 kg
5 kg
$67.00
$161.00
$255.00
$721.00
$3401.00
4
(1)

Trimethoprim is a direct inhibitor of CYPOR, specifically affecting its electron transfer activity. By binding to CYPOR, it disrupts the transfer of electrons from NADPH to cytochrome P450 enzymes, leading to a decrease in their enzymatic function.

Tamoxifen

10540-29-1sc-208414
2.5 g
$272.00
18
(2)

Tamoxifen is a direct inhibitor of CYPOR, acting on its electron transfer function. It interferes with the transfer of electrons from NADPH to cytochrome P450 enzymes, particularly those involved in the metabolism of endogenous and exogenous compounds.

Ketoconazole

65277-42-1sc-200496
sc-200496A
50 mg
500 mg
$63.00
$265.00
21
(1)

Ketoconazole is a direct inhibitor of CYPOR, targeting its electron transfer function. It disrupts the flow of electrons from NADPH to cytochrome P450 enzymes, leading to a decrease in their catalytic activity.