Date published: 2026-4-24

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C1r Inhibitors

C1r inhibitors belong to a specific class of chemical compounds designed to modulate the activity of the C1r protein, a crucial component of the complement system. The complement system is an integral part of the immune system, responsible for recognizing and eliminating pathogens through a cascade of enzymatic reactions. C1r is one of the initiating enzymes in the classical pathway of the complement system, playing a pivotal role in the activation of downstream components. Inhibitors targeting C1r aim to regulate the complement system by impeding the enzymatic activity of this protein. By interfering with the activation of the classical pathway, C1r inhibitors modulate immune responses and influence the inflammatory processes associated with complement activation. C1r inhibitors are carefully designed molecules that interact with specific binding sites on the C1r protein, hindering its normal enzymatic function. The inhibitory mechanism may involve blocking the active site or altering the conformation of C1r to hinder its interaction with other complement components. Researchers employ various strategies to develop effective C1r inhibitors, including rational drug design and high-throughput screening of chemical libraries. Understanding the structural and biochemical aspects of C1r inhibition is crucial for optimizing the design of these compounds.
Product NameCAS #Catalog #QUANTITYPriceCitationsRATING

p-APMSF, Hydrochloride

74938-88-8sc-204155
sc-204155A
sc-204155B
sc-204155C
5 mg
10 mg
50 mg
100 mg
$87.00
$111.00
$305.00
$571.00
1
(1)

p-APMSF, Hydrochloride acts as a potent c1r inhibitor, characterized by its ability to form stable complexes through electrostatic and hydrophobic interactions. This compound exhibits a unique reactivity profile, facilitating selective acylation of target residues, which alters enzymatic activity. Its solubility in polar solvents enhances its diffusion across membranes, allowing for rapid engagement with biological targets. The compound's distinct steric properties influence its binding kinetics, leading to significant modulation of cellular signaling pathways.

Sivelestat

127373-66-4sc-203938
1 mg
$105.00
2
(1)

A neutrophil elastase inhibitor that can indirectly reduce the activation of the complement system by limiting the release of elastase, which can modulate complement activity.

Nafamostat mesylate

82956-11-4sc-201307
sc-201307A
10 mg
50 mg
$82.00
$306.00
4
(1)

A serine protease inhibitor that can indirectly affect C1R activity by inhibiting factors such as kallikrein, which are involved in the complement activation pathway.

Tranexamic acid

1197-18-8sc-204921
sc-204921A
5 g
10 g
$29.00
$50.00
10
(1)

An antifibrinolytic that may indirectly influence C1R by stabilizing fibrin and preventing plasminogen activation, which can modulate the complement system.

Andrographolide

5508-58-7sc-205594
sc-205594A
50 mg
100 mg
$15.00
$40.00
7
(1)

A labdane diterpenoid that is known to have anti-inflammatory properties and may indirectly influence C1R activity through modulation of the complement pathway.

Berberine

2086-83-1sc-507337
250 mg
$92.00
1
(0)

An isoquinoline alkaloid that has been reported to have complement-inhibitory activities, potentially affecting C1R indirectly by stabilizing the complement system.

(−)-Epigallocatechin Gallate

989-51-5sc-200802
sc-200802A
sc-200802B
sc-200802C
sc-200802D
sc-200802E
10 mg
50 mg
100 mg
500 mg
1 g
10 g
$43.00
$73.00
$126.00
$243.00
$530.00
$1259.00
11
(1)

A polyphenol from green tea that has been reported to interfere with the complement cascade, possibly affecting C1R indirectly by inhibiting the conversion of C3 to C3a and C3b.

Curcumin

458-37-7sc-200509
sc-200509A
sc-200509B
sc-200509C
sc-200509D
sc-200509F
sc-200509E
1 g
5 g
25 g
100 g
250 g
1 kg
2.5 kg
$37.00
$69.00
$109.00
$218.00
$239.00
$879.00
$1968.00
47
(1)

A natural phenolic compound that may modulate the immune response and indirectly inhibit C1R by affecting multiple points in the complement pathway.