Date published: 2026-4-24

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DDAH I Inhibitors

DDAH I inhibitors represents a diverse spectrum of compounds, each intricately modulating the activity of dimethylarginine dimethylaminohydrolase I (DDAH I). These inhibitors play a crucial role in understanding the regulation of asymmetric dimethylarginine (ADMA) metabolism and the broader implications for nitric oxide (NO) signaling pathways. L-257, a selective inhibitor, directly targets DDAH I, preventing the conversion of ADMA to citrulline and methylamine. Nω-Methyl-L-arginine acetate competes with ADMA for binding to the active site, acting as a competitive inhibitor that mimics the substrate's structure. S-(2-Boronoethyl)-L-cysteine, with its boronate moiety, induces reversible inhibition by forming a boronate ester with DDAH I. Analogous to Nω-Methyl-L-arginine acetate, 2,3-Diaminopropanoic acid and L-α-Aminoindan-2-phosphonic acid competitively inhibit DDAH I by structurally resembling ADMA. In contrast, AMT directly inhibits DDAH I, restricting its enzymatic function and impacting ADMA metabolism. L-Homocitrulline, D-Aspartic acid, and 7-Nitroindazole function as competitive inhibitors by mimicking ADMA's structure. S-Methylisothiourea sulfate and Sodium nitroprusside, acting indirectly, modulate nitric oxide (NO) levels, impacting the feedback inhibition of DDAH I and altering ADMA metabolism. This collection of chemical inhibitors serves as a valuable toolkit for researchers delving into the nuanced regulation of DDAH I. The diverse mechanisms by which these compounds interfere with the enzymatic function of DDAH I shed light on the intricacies of ADMA metabolism and NO signaling. As researchers navigate this chemical landscape, they uncover crucial insights into the implications of modulating DDAH I activity in various physiological and pathological contexts.
Product NameCAS #Catalog #QUANTITYPriceCitationsRATING

L-NG-Monomethylarginine, Acetate Salt (L-NMMA)

53308-83-1sc-200739
sc-200739A
sc-200739B
sc-200739C
25 mg
100 mg
1 g
100 g
$90.00
$260.00
$800.00
$40378.00
3
(1)

Nω-Methyl-L-arginine acetate (L-NMMA) is a competitive inhibitor of DDAH I. It competes with asymmetric dimethylarginine (ADMA) for binding to the active site of DDAH I. By mimicking the structure of ADMA, L-NMMA interferes with the enzymatic activity of DDAH I, preventing the normal conversion of ADMA to citrulline and methylamine.

Ammonium metatungstate hydrate

12333-11-8sc-239234
sc-239234A
100 g
500 g
$95.00
$378.00
(0)

Ammonium metatungstate is a potent and selective inhibitor of DDAH I. It directly inhibits DDAH I activity, preventing the conversion of asymmetric dimethylarginine (ADMA) to citrulline and methylamine. The inhibition of DDAH I by AMT leads to elevated levels of ADMA, impacting nitric oxide synthase (NOS) activity and modulating NO signaling pathways. The modulation of DDAH I by AMT occurs at the catalytic site, restricting its enzymatic function and influencing NO signaling.

L-Homocitrulline

1190-49-4sc-269298
sc-269298A
sc-269298B
sc-269298C
100 mg
1 g
10 g
25 g
$72.00
$250.00
$490.00
$1098.00
5
(1)

L-Homocitrulline is a substrate analog and competitive inhibitor of DDAH I. Structurally resembling asymmetric dimethylarginine (ADMA), it competes with ADMA for binding to the active site of DDAH I. The competitive inhibition by L-homocitrulline interferes with the normal metabolism of ADMA, leading to altered nitric oxide (NO) signaling pathways. The chemical's action involves direct competition for the enzyme's active site.

D-Aspartic acid

1783-96-6sc-202562
1 g
$31.00
(0)

D-Aspartic acid is a competitive inhibitor of DDAH I. Similar to other substrate analogs, it mimics the structure of asymmetric dimethylarginine (ADMA) and competes for binding to the active site of DDAH I. The competitive inhibition by D-aspartic acid interferes with the normal metabolism of ADMA, leading to altered nitric oxide (NO) signaling pathways. The chemical's action involves direct competition for the enzyme's active site.

7-Nitroindazole

2942-42-9sc-3569
100 mg
$70.00
4
(2)

7-Nitroindazole is a selective inhibitor of nitric oxide synthase (NOS). It indirectly inhibits DDAH I by reducing the availability of nitric oxide (NO). The reduction in NO levels impacts the feedback inhibition of DDAH I, leading to altered ADMA metabolism. The indirect inhibition by 7-nitroindazole involves modulation of the NO signaling pathway, influencing DDAH I activity and the levels of its substrate, asymmetric dimethylarginine (ADMA).

S-Methylisothiourea sulfate

867-44-7sc-3566
sc-3566A
1 g
100 g
$20.00
$23.00
8
(2)

S-Methylisothiourea sulfate is a potent and selective inhibitor of inducible nitric oxide synthase (iNOS). It indirectly inhibits DDAH I by reducing the availability of nitric oxide (NO). The reduction in NO levels impacts the feedback inhibition of DDAH I, leading to altered ADMA metabolism.

Sodium nitroprusside dihydrate

13755-38-9sc-203395
sc-203395A
sc-203395B
1 g
5 g
100 g
$43.00
$85.00
$158.00
7
(1)

Sodium nitroferricyanide is a nitric oxide (NO) donor. It indirectly inhibits DDAH I by increasing the availability of NO. The elevated NO levels impact the feedback inhibition of DDAH I, leading to altered ADMA metabolism. The indirect inhibition by sodium nitroprusside involves modulation of the NO signaling pathway, influencing DDAH I activity and the levels of its substrate, asymmetric dimethylarginine (ADMA).