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Inhibitors

Enzyme inhibitors are molecules that interact in certain ways with the enzyme to prevent it from functioning in a normal manner. They can alter the catalytic action of the enzyme and consequently slow down, or even stop catalysis. Inhibitors can act in various modes when interacting with the enzyme: reversible or irreversible inhibition, covalent binding or non-covalent binding, as well as specific or nonspecific inhibition. Based on the inhibition kinetics, enzyme inhibition can be categorized into three major types: competitive inhibition, non-competitive inhibition, and uncompetitive inhibition.

Competitive Inhibition
Competitive inhibition occurs when an inhibitor and a substrate both tend to bind to the enzyme in an exclusive manner. A competitive inhibitor could be any compound that closely resembles the chemical structure and molecular geometry of the substrate. The inhibitor competes for the same active site with the substrate molecule. Upon binding, interactions between the inhibitor and the enzyme may be strong in the active site, but no reaction would happen because the inhibitor does not carry the same chemical reactivity. As a result, the inhibitor is "stuck" on the enzyme and prevents any substrate molecules from reacting with the enzyme, and thus the reaction rate is decreased. However, a competitive inhibition is usually temporary and reversible. Therefore, the level of inhibition depends upon the relative concentrations of the substrate and inhibitor, as well as the relative affinities of the inhibitor and substrate to the active site, since they are competing for places in the enzyme active sites.

Non-Competitive Inhibition
Non-competitive inhibitors bind to the enzyme regardless of whether the active site is already occupied by the substrate. In fact, the enzyme could be in complexes with either the substrate or inhibitor, or both during non-competitive inhibition. A common form of non-competitive inhibition is called allosteric inhibition, where the inhibitor does not bind to the active site, but the allosteric site. Binding to an allosteric site distorts the 3-dimensional tertiary structure of the enzyme, such that it can no longer catalyze a reaction. There are also other mechanisms of non-competitive inhibition than allosteric inhibition. For example, both the substrate and inhibitor could bind to the active site at the same time. Some non-competitive inhibitors are irreversible and permanent because they denature the enzymes effectively. However, there are also non-competitive inhibitors reversibly and non-permanently stops the enzymatic reaction, which are vital in controlling metabolic functions in organisms.

Uncompetitive Inhibition
Uncompetitive inhibition is not commonly seen. An uncompetitive inhibitor binds to the enzyme and enhances the binding affinity of the substrate, but the resultant enzyme-inhibitor-substrate complex undergoes reaction to form the product very slowly. It should be noted that uncompetitive inhibition requires the formation of an enzyme-substrate complex prior to binding to the inhibitor. To the contrary, non-competitive inhibition can occur with or without the substrate present.

Application of the Enzyme Inhibitors
Enzyme inhibitors play important roles in pharmaceutical and biochemical industries. They can be widely used in metabolic control, as metabolic poisons and medicines. For example, many poisons work by inhibiting the action of enzymes involved in metabolic processes, which defends a plant or animal against predators. In addition, some enzyme inhibitors can be used as drugs in the treatment of various diseases. Some antimicrobial drugs are enzyme inhibitors that deactivate the enzymes that are needed for the survival of pathogens.

Creative Enzymes gladly supply various enzyme inhibitors of premier grade to the customers. We persist in being the most reliable supplier for enzyme products in the global market. Today, Creative Enzymes is a leading company in enzymes and enzyme-related products, and is well known for the high level of customer satisfaction. We deliver the products in a momentary span of time from order placement to final delivery. Our prompt service, dedicated customer care, and reliable approaches have made us the most preferred vendor.

Products Type
Zymogens Enzymes Coenzymes Substrates Inhibitors Others
Product Name
Catalog
ProductName
EC No.
CAS No.
Source
Price
CatalogCEI-1501
ProductNameRetaspimycin
EC No.
CAS No.857402-23-4
Source
CatalogCEI-1500
EC No.
CAS No.1187075-34-8
Source
CatalogCEI-1499
EC No.
CAS No.864814-88-0
Source
CatalogCEI-1498
ProductNameRepSox
EC No.
CAS No.446859-33-2
Source
CatalogCEI-1497
EC No.
CAS No.266359-93-7
Source
CatalogCEI-1496
ProductNameReparixin
EC No.
CAS No.266359-83-5
Source
CatalogCEI-1495
EC No.
CAS No.1019206-88-2
Source
CatalogCEI-1494
ProductNameRanolazine 2HCl
EC No.
CAS No.95635-56-6
Source
CatalogCEI-1493
ProductNameRacecadotril
EC No.
CAS No.81110-73-8
Source
CatalogCEI-1492
ProductNameR-7128
EC No.
CAS No.940908-79-2
Source
CatalogCEI-1491
ProductNameR-1479
EC No.
CAS No.478182-28-4
Source
CatalogCEI-1490
ProductNamePU-H71
EC No.
CAS No.873436-91-0
Source
CatalogCEI-1489
ProductNamePSI-7977
EC No.
CAS No.1190307-88-0
Source
CatalogCEI-1488
ProductNamePSI-6206
EC No.
CAS No.863329-66-2
Source
CatalogCEI-1487
ProductNamePSI-6130
EC No.
CAS No.817204-33-4
Source
CatalogCEI-1486
EC No.
CAS No.1370261-97-4
Source
CatalogCEI-1485
ProductNamePrasugrel
EC No.
CAS No.150322-43-3
Source
CatalogCEI-1484
ProductNamePoloxin
EC No.
CAS No.321688-88-4
Source
CatalogCEI-1483
EC No.
CAS No.91396-88-2
Source
CatalogCEI-1482
ProductNamePJ34
EC No.
CAS No.344458-19-1
Source
CatalogCEI-1481
EC No.
CAS No.1245319-54-3
Source
CatalogCEI-1480
EC No.
CAS No.1332075-63-4
Source
CatalogCEI-1479
EC No.
CAS No.371935-79-4
Source
CatalogCEI-1478
ProductNamePHT-427
EC No.
CAS No.1191951-57-1
Source
CatalogCEI-1477
ProductNamePF-8380
EC No.
CAS No.1144035-53-9
Source
CatalogCEI-1476
ProductNamePF-670462
EC No.
CAS No.950912-80-8
Source
CatalogCEI-1475
ProductNamePF-543 Citrate
EC No.
CAS No.1415562-83-2
Source
CatalogCEI-1474
ProductNamePF-543
EC No.
CAS No.1415562-82-1
Source
CatalogCEI-1473
ProductNamePF-3845
EC No.
CAS No.1196109-52-0
Source
CatalogCEI-1472
ProductNamePF-3758309
EC No.
CAS No.898044-15-0
Source

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