Date published: 2025-10-14

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TH Inhibitors

Tyrosine hydrolase, often referred to in the literature as tyrosine hydroxylase (TH), is a critical enzyme in the biosynthesis of catecholamines. It catalyzes the conversion of the amino acid tyrosine into dihydroxyphenylalanine (DOPA), a precursor of neurotransmitters like dopamine, norepinephrine, and epinephrine. This conversion involves the hydroxylation of the aromatic ring of tyrosine, which is the rate-limiting step in the catecholamine synthesis pathway. Given the pivotal role of TH in the synthesis of these neurotransmitters, its activity is tightly regulated and is of substantial biochemical significance. Inhibitors of tyrosine hydrolase, known as tyrosine hydrolase inhibitors, are compounds that reduce or halt the enzymatic activity of this enzyme. These inhibitors can function through multiple mechanisms, which can include competitive, non-competitive, or uncompetitive inhibition. The structural diversity of TH inhibitors ranges from simple synthetic molecules to intricate natural products. Some inhibitors function by binding directly to the active site of the enzyme, preventing the substrate from accessing it. Others may interact with allosteric sites on the enzyme, triggering conformational changes that diminish its activity.

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Items 1 to 10 of 15 total

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Product NameCAS #Catalog #QUANTITYPriceCitationsRATING

Benserazide·HCl (Ro 4-4602)

14919-77-8sc-200723
sc-200723A
100 mg
1 g
$26.00
$85.00
(1)

Benserazide·HCl is characterized by its ability to modulate neurotransmitter synthesis through selective inhibition of aromatic L-amino acid decarboxylase. Its unique structural features allow for specific binding interactions with the enzyme's active site, influencing reaction kinetics and substrate availability. The compound's hydrophilic nature enhances its solubility, promoting effective diffusion in biological systems, which is crucial for maintaining optimal enzymatic activity and metabolic balance.

N-Methyl-L-tyrosine

537-49-5sc-208044
250 mg
$236.00
(0)

N-Methyl-L-tyrosine acts as a competitive inhibitor of tyrosine hydroxylase, impacting catecholamine biosynthesis. Its structural conformation allows for effective interaction with the enzyme's active site, altering substrate affinity and reaction rates. The compound's unique steric properties facilitate specific molecular interactions, influencing metabolic pathways. Additionally, its moderate hydrophobicity affects membrane permeability, potentially altering cellular uptake and distribution dynamics.

α-Methyl-D,L-tyrosine

620-30-4sc-207231
2.5 g
$190.00
(0)

α-Methyl-D,L-tyrosine serves as a potent modulator of neurotransmitter synthesis by influencing the activity of aromatic amino acid decarboxylase. Its unique stereochemistry enhances binding affinity, leading to altered kinetics in enzymatic reactions. The compound's hydrophilic character promotes solubility in biological systems, while its ability to form hydrogen bonds can affect protein interactions. This interplay of properties contributes to its role in metabolic regulation and cellular signaling pathways.

3-Iodo-L-tyrosine

70-78-0sc-216471
sc-216471A
sc-216471B
1 g
5 g
25 g
$80.00
$200.00
$592.00
(0)

This compound inhibits TH by competing with its natural substrate, tyrosine. By doing so, it can decrease the synthesis of catecholamines.

α-Methyl-L-p-tyrosine

672-87-7sc-207232
25 mg
$260.00
1
(0)

AMPT is a well-known inhibitor of TH. It competes with the substrate tyrosine, thereby reducing the production of DOPA and downstream catecholamines.

α-Methyl-D,L-p-tyrosine, Methyl Ester, Hydrochloride

7361-31-1sc-219470
1 g
$359.00
3
(0)

α-Methyl-D,L-p-tyrosine, Methyl Ester, Hydrochloride exhibits distinctive characteristics as a TH, particularly in its interaction with enzymatic pathways. The compound's methyl ester group enhances lipophilicity, facilitating membrane permeability and influencing cellular uptake. Its structural conformation allows for specific interactions with active sites of enzymes, potentially altering reaction rates. Additionally, the presence of the hydrochloride salt form increases solubility, impacting its reactivity in various biochemical environments.

Methacycline Hydrochloride

3963-95-9sc-211806
sc-211806A
100 mg
1 g
$96.00
$693.00
(0)

Metyrosine is a tyrosine analog and acts as a competitive inhibitor of TH, reducing catecholamine synthesis.

6-Hydroxydopamine hydrochloride

28094-15-7sc-203482
100 mg
$146.00
8
(1)

While primarily a neurotoxin, 6-OHDA can inhibit TH, leading to reduced catecholamine synthesis.

Fenamic acid

91-40-7sc-202590
1 g
$20.00
1
(0)

This compound has been shown to inhibit TH activity, potentially by competing with the cofactor tetrahydrobiopterin.

7,8-Dihydroxyflavone

38183-03-8sc-278634
100 mg
$51.00
2
(1)

Although it has multiple cellular targets, 7,8-Dihydroxyflavone can inhibit TH and consequently reduce catecholamine synthesis.