Date published: 2026-4-24

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ERp19 Inhibitors

Chemical inhibitors of ERp19 include a variety of compounds that function by interacting with the active site or modifying the critical cysteine residues necessary for its enzymatic activity. Iodoacetamide, for instance, can alkylate the thiol groups of cysteine residues within ERp19, leading to the inhibition of its protein disulfide isomerase activity. This is a targeted mechanism where the chemical directly impedes the enzymatic function by covalently modifying the active site. Similarly, Ebselen, acting as a glutathione peroxidase mimic, covalently modifies thiol groups and can inhibit ERp19 by altering its active cysteine residues. Phenylarsine oxide (PAO) also targets thiol groups within the protein, but it operates by crosslinking the cysteine residues, which inhibits the protein's disulfide isomerase function. Another inhibitor, Bacitracin, binds to the active sites of protein disulfide isomerase enzymes, and given that ERp19 shares this activity, Bacitracin can effectively inhibit it. Further inhibitors such as Aurintricarboxylic acid can obstruct the catalytic domain of ERp19, interfering with substrate access and thereby inhibiting its function. Ethacrynic acid and Diethyl maleate are alkylating agents that modify the active site cysteines in ERp19, preventing it from catalyzing its normal enzymatic reactions. Tunicamycin, which inhibits N-linked glycosylation, can affect ERp19 by altering the glycoprotein folding environment, an indirect yet significant method of inhibition since ERp19 is implicated in the quality control of this process. Quercetin alters the cellular redox state, which can influence the formation of disulfide bonds that are crucial for the isomerase activity of ERp19. Lastly, ML348, while not a direct inhibitor, affects the redox balance within the cell, which can have downstream effects on the functional activity of ERp19 by altering the cellular context in which ERp19 operates.
Product NameCAS #Catalog #QUANTITYPriceCitationsRATING

α-Iodoacetamide

144-48-9sc-203320
25 g
$255.00
1
(1)

Iodoacetamide can react with cysteine residues in proteins, leading to the alkylation of thiol groups. ERp19 has a catalytic domain with cysteine residues critical for its enzymatic function, and alkylation of these residues by iodoacetamide would inhibit its protein disulfide isomerase activity.

Ebselen

60940-34-3sc-200740B
sc-200740
sc-200740A
1 mg
25 mg
100 mg
$33.00
$136.00
$458.00
5
(1)

Ebselen is a seleno-organic compound that can mimic glutathione peroxidase activity and also covalently modify thiol groups in proteins. By modifying the thiol groups of cysteine residues in ERp19, ebselen can inhibit its enzymatic activity.

Bacitracin

1405-87-4sc-252399
5 g
$89.00
1
(1)

Bacitracin is known to inhibit protein disulfide isomerase enzymes by binding to their active sites. As ERp19 exhibits protein disulfide isomerase-like activity, bacitracin can directly inhibit this activity, thereby functionally inhibiting ERp19.

Phenylarsine oxide

637-03-6sc-3521
250 mg
$41.00
4
(1)

Phenylarsine oxide can bind to vicinal thiol groups in proteins, inhibiting protein disulfide isomerase enzymes by crosslinking the cysteine residues. This mechanism can inhibit the enzymatic activity of ERp19.

Aurintricarboxylic Acid

4431-00-9sc-3525
sc-3525A
sc-3525B
sc-3525C
100 mg
1 g
5 g
10 g
$20.00
$32.00
$48.00
$94.00
13
(1)

Aurintricarboxylic acid is a polyaromatic carboxylic acid known to inhibit various protein-nucleic acid interactions. It can inhibit the enzymatic function of ERp19 by nonspecifically associating with its catalytic domain, obstructing substrate access.

Ethacrynic acid

58-54-8sc-257424
sc-257424A
1 g
5 g
$90.00
$300.00
5
(1)

Ethacrynic acid contains a reactive α,β-unsaturated ketone that can form adducts with cysteine residues. By modifying the active site cysteines in ERp19, ethacrynic acid can inhibit its enzymatic function.

Diethylmaleate

141-05-9sc-202577
5 g
$27.00
4
(1)

Diethyl maleate is an alkylating agent that can conjugate to the thiol groups of cysteine residues. This can inhibit ERp19 by blocking the cysteine residues essential for its disulfide isomerase activity.

Tunicamycin

11089-65-9sc-3506A
sc-3506
5 mg
10 mg
$172.00
$305.00
66
(3)

Tunicamycin inhibits N-linked glycosylation. ERp19 has been implicated in the quality control of glycoprotein folding. Inhibition of glycosylation can indirectly affect the substrate availability and function of ERp19.

Quercetin

117-39-5sc-206089
sc-206089A
sc-206089E
sc-206089C
sc-206089D
sc-206089B
100 mg
500 mg
100 g
250 g
1 kg
25 g
$11.00
$17.00
$110.00
$250.00
$936.00
$50.00
33
(2)

Quercetin is a flavonoid with antioxidant properties that can modulate the redox state of cells. By altering the redox environment, quercetin can indirectly affect the disulfide bond formation and isomerase activity of ERp19.