Date published: 2025-10-7

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Sir2 Inhibitors

The Sir2 family of proteins, also known as sirtuins, represents a conserved class of NAD+-dependent deacetylases with diverse cellular functions. Among these, Sir2 (Silent Information Regulator 2) proteins are notably recognized for their involvement in regulating various biological processes, including gene silencing, DNA repair, and cellular metabolism. Initially identified in yeast, Sir2 proteins have been evolutionarily conserved from bacteria to humans, underscoring their fundamental importance in cellular homeostasis. Functionally, Sir2 proteins exhibit deacetylase activity, catalyzing the removal of acetyl groups from lysine residues in histones and non-histone proteins. This deacetylation activity is coupled with the consumption of nicotinamide adenine dinucleotide (NAD+), linking Sir2 function to cellular energy status. The inhibition of Sir2 proteins, often referred to as Sir2 inhibitors, involves targeting the conserved catalytic domain responsible for their deacetylase activity. Several mechanisms contribute to the inhibition of Sir2 proteins, with the overarching goal of disrupting their NAD+-dependent deacetylase function. One prominent approach involves the development of small molecules that mimic the structure of NAD+, thereby competitively inhibiting the binding of NAD+ to the catalytic site of Sir2. This interference curbs the enzymatic deacetylation of target proteins, leading to alterations in cellular processes influenced by Sir2 activity. Another mechanism of Sir2 inhibition involves the development of compounds that specifically target the substrate-binding site of Sir2 proteins. By interfering with the interaction between Sir2 and its substrate proteins, these inhibitors disrupt the deacetylation process and, consequently, the downstream effects on chromatin structure, gene expression, and other cellular functions. Additionally, strategies may focus on modulating the cellular availability of NAD+, affecting the overall activity of Sir2 proteins. Altering NAD+ levels through pharmacological or genetic means can impact Sir2 function, providing an indirect avenue for inhibiting its deacetylase activity and downstream cellular effects.

Items 1 to 10 of 11 total

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Product NameCAS #Catalog #QUANTITYPriceCitationsRATING

Splitomicin

5690-03-9sc-358701
5 mg
$47.00
(1)

Splitomicin acts as a potent inhibitor of Sir2, engaging in specific hydrogen bonding interactions that stabilize its binding to the enzyme's active site. This compound selectively modulates the deacetylation process, influencing histone modification and gene expression. Its unique structural features allow for enhanced interaction with the NAD+ cofactor, affecting the kinetics of the enzymatic reaction. Furthermore, Splitomicin's solubility profile supports its effective diffusion across cellular membranes, impacting its interaction dynamics within cellular environments.

Nicotinamide

98-92-0sc-208096
sc-208096A
sc-208096B
sc-208096C
100 g
250 g
1 kg
5 kg
$43.00
$65.00
$200.00
$815.00
6
(1)

Nicotinamide competes with NAD+ for the active site on Sir2, leading to inhibition of its deacetylase activity.

Sirtinol

410536-97-9sc-205976
sc-205976A
1 mg
5 mg
$37.00
$111.00
14
(1)

Sirtinol functions as a selective inhibitor of Sir2, characterized by its ability to disrupt the enzyme's catalytic activity through competitive binding. Its unique structural conformation facilitates specific interactions with the enzyme's active site, altering the conformational dynamics essential for substrate recognition. This compound also influences the NAD+-dependent deacetylation pathway, modulating the enzyme's reaction kinetics and impacting downstream signaling pathways. Additionally, Sirtinol's hydrophilic properties enhance its solubility, promoting its accessibility within cellular compartments.

Dihydrocoumarin

119-84-6sc-227867
sc-227867A
5 g
25 g
$17.00
$41.00
(0)

Dihydrocoumarin acts as a modulator of Sir2, exhibiting a distinct mechanism of interaction that influences the enzyme's structural stability. Its unique lactone ring allows for non-covalent interactions with key residues in the active site, potentially altering the enzyme's affinity for NAD+. This compound may also affect the conformational flexibility of Sir2, thereby impacting its deacetylation activity and subsequent cellular processes. Its lipophilic nature aids in membrane permeability, facilitating cellular uptake.

Suramin sodium

129-46-4sc-507209
sc-507209F
sc-507209A
sc-507209B
sc-507209C
sc-507209D
sc-507209E
50 mg
100 mg
250 mg
1 g
10 g
25 g
50 g
$149.00
$210.00
$714.00
$2550.00
$10750.00
$21410.00
$40290.00
5
(1)

Suramin has been shown to non-selectively inhibit various enzymes, including Sir2, by interfering with substrate binding.

SIRT1/2 Inhibitor IV, Cambinol

14513-15-6sc-204280
5 mg
$142.00
4
(1)

Cambinol selectively inhibits sirtuin activity, which can reduce the deacetylase activity of Sir2.

EX 527

49843-98-3sc-203044
5 mg
$85.00
32
(1)

EX-527 is a selective inhibitor of SIRT1, a homolog of Sir2, and can inhibit Sir2 by a similar mechanism of action.

Salermide

1105698-15-4sc-224276
sc-224276A
5 mg
10 mg
$70.00
$105.00
3
(1)

Salermide is a sirtuin inhibitor that can induce apoptosis by inhibiting Sir2-related deacetylation processes.

Tenovin-6

1011557-82-6sc-224296
sc-224296A
1 mg
5 mg
$272.00
$1214.00
9
(1)

Tenovin-6 inhibits Sir2 by increasing the levels of p53, which indirectly reduces Sir2 activity by promoting cellular stress.

SIRT2 Inhibitor, AGK2

304896-28-4sc-202813A
sc-202813
sc-202813B
sc-202813C
1 mg
5 mg
10 mg
25 mg
$45.00
$145.00
$310.00
$480.00
5
(1)

AGK2 is a selective SIRT2 inhibitor and may inhibit Sir2 by interfering with its NAD+-dependent deacetylase activity.