The complement system helps or “complements” the ability of antibodies and phagocytic cells to clear pathogens from an organism. It is part of the immune system called the innate immune system that is not adaptable and does not change over the course of an individual's lifetime. The complement system consists of a number of small proteins found in the blood, in general synthesized by the liver, and normally circulating as inactive precursors (pro-proteins). When stimulated by one of several triggers, proteases in the system cleave specific proteins to release cytokines and initiate an amplifying cascade of further cleavages. The end-result of this activation cascade is massive amplification of the response and activation of the cell-killing membrane attack complex. Over 30 proteins and protein fragments make up the complement system. Three biochemical pathways activate the complement system: the classical complement pathway, the alternative complement pathway, and the lectin pathway.


Anti-infection >
Arenavirus Bacterial CMV Enterovirus Filovirus Fungal HBV HCV HIV HSV Influenza Virus Parasite Reverse Transcriptase RSV SARS-CoV
Antibody-drug Conjugate >
ADC Cytotoxin ADC Linker Drug-Linker Conjugates for ADC PROTAC-linker Conjugate for PAC
Apoptosis >
Apoptosis Bcl-2 Family c-Myc Caspase DAPK Ferroptosis IAP MDM-2/p53 PKD RIP kinase Survivin Thymidylate Synthase TNF Receptor
Autophagy >
Autophagy LRRK2 ULK Mitophagy
Cell Cycle/DNA Damage >
Antifolate APC ATM/ATR Aurora Kinase Casein Kinase CDK Checkpoint Kinase (Chk) CRISPR/Cas9 Deubiquitinase DNA Alkylator/Crosslinker DNA-PK DNA/RNA Synthesis Eukaryotic Initiation Factor (eIF) G-quadruplex Haspin Kinase HDAC HSP IRE1 Kinesin LIM Kinase (LIMK) Microtubule/Tubulin Mps1 Nucleoside Antimetabolite/Analog p97 PAK PARP PERK Polo-like Kinase (PLK) PPAR RAD51 ROCK Sirtuin SRPK Telomerase TOPK Topoisomerase Wee1
Cytoskeleton >
Arp2/3 Complex Dynamin Gap Junction Protein Integrin Kinesin Microtubule/Tubulin Mps1 Myosin PAK
Epigenetics >
AMPK Aurora Kinase DNA Methyltransferase Epigenetic Reader Domain HDAC Histone Acetyltransferase Histone Demethylase Histone Methyltransferase JAK MicroRNA PARP PKC Sirtuin Protein Arginine Deiminase
GPCR/G Protein >
5-HT Receptor Adenosine Receptor Adenylate Cyclase Adiponectin Receptor Adrenergic Receptor Angiotensin Receptor Bombesin Receptor Bradykinin Receptor Cannabinoid Receptor CaSR CCR CGRP Receptor Cholecystokinin Receptor CRFR CXCR Dopamine Receptor EBI2/GPR183 Endothelin Receptor GHSR Glucagon Receptor Glucocorticoid Receptor GNRH Receptor GPCR19 GPR109A GPR119 GPR120 GPR139 GPR40 GPR55 GPR84 Guanylate Cyclase Histamine Receptor Imidazoline Receptor Leukotriene Receptor LPL Receptor mAChR MCHR1 (GPR24) Melatonin Receptor mGluR Motilin Receptor Neurokinin Receptor Neuropeptide Y Receptor Neurotensin Receptor Opioid Receptor Orexin Receptor (OX Receptor) Oxytocin Receptor P2Y Receptor Prostaglandin Receptor Protease-Activated Receptor (PAR) Ras RGS Protein Sigma Receptor Somatostatin Receptor TSH Receptor Urotensin Receptor Vasopressin Receptor Melanocortin Receptor
Immunology/Inflammation >
Aryl Hydrocarbon Receptor CCR Complement System COX CXCR FLAP Histamine Receptor IFNAR Interleukin Related IRAK MyD88 NO Synthase NOD-like Receptor (NLR) PD-1/PD-L1 PGE synthase Salt-inducible Kinase (SIK) SPHK STING Thrombopoietin Receptor Toll-like Receptor (TLR) Arginase
JAK/STAT Signaling >
EGFR JAK Pim STAT
MAPK/ERK Pathway >
ERK JNK KLF MAP3K MAP4K MAPKAPK2 (MK2) MEK Mixed Lineage Kinase MNK p38 MAPK Raf Ribosomal S6 Kinase (RSK)
Membrane Transporter/Ion Channel >
ATP Synthase BCRP Calcium Channel CFTR Chloride Channel CRAC Channel CRM1 EAAT2 GABA Receptor GlyT HCN Channel iGluR Monoamine Transporter Monocarboxylate Transporter Na+/Ca2+ Exchanger Na+/HCO3- Cotransporter Na+/K+ ATPase nAChR NKCC P-glycoprotein P2X Receptor Potassium Channel Proton Pump SGLT Sodium Channel TRP Channel URAT1
Metabolic Enzyme/Protease >
15-PGDH 5 alpha Reductase 5-Lipoxygenase Acetyl-CoA Carboxylase Acyltransferase Adenosine Deaminase Adenosine Kinase Aldehyde Dehydrogenase (ALDH) Aldose Reductase Aminopeptidase Angiotensin-converting Enzyme (ACE) ATGL ATP Citrate Lyase Carbonic Anhydrase Carboxypeptidase Cathepsin CETP COMT Cytochrome P450 Dipeptidyl Peptidase Dopamine β-hydroxylase E1/E2/E3 Enzyme Elastase Enolase FAAH FABP Factor Xa Farnesyl Transferase Fatty Acid Synthase (FAS) FXR Glucokinase GSNOR Gutathione S-transferase HCV Protease Hexokinase HIF/HIF Prolyl-Hydroxylase HIV Integrase HIV Protease HMG-CoA Reductase (HMGCR) HSP Indoleamine 2,3-Dioxygenase (IDO) Isocitrate Dehydrogenase (IDH) Lactate Dehydrogenase LXR MAGL Mineralocorticoid Receptor Mitochondrial Metabolism MMP Nampt NEDD8-activating Enzyme Neprilysin PAI-1 PDHK PGC-1α Phosphatase Phosphodiesterase (PDE) Phospholipase Procollagen C Proteinase Proteasome Pyruvate Kinase RAR/RXR Renin ROR Ser/Thr Protease SGK Stearoyl-CoA Desaturase (SCD) Thrombin Tryptophan Hydroxylase Tyrosinase Xanthine Oxidase
Neuronal Signaling >
5-HT Receptor AChE Adenosine Kinase Amyloid-β Beta-secretase CaMK CGRP Receptor COMT Dopamine Receptor Dopamine Transporter FAAH GABA Receptor GlyT iGluR Imidazoline Receptor mAChR Melatonin Receptor Monoamine Oxidase nAChR Neurokinin Receptor Opioid Receptor Serotonin Transporter γ-secretase
NF-κB >
NF-κB IKK Keap1-Nrf2 MALT1
PI3K/Akt/mTOR >
Akt AMPK ATM/ATR DNA-PK GSK-3 MELK mTOR PDK-1 PI3K PI4K PIKfyve PTEN
PROTAC >
PROTAC E3 Ligase Ligand-Linker Conjugate Ligand for E3 Ligase PROTAC Linker PROTAC-linker Conjugate for PAC
Protein Tyrosine Kinase/RTK >
Ack1 ALK Bcr-Abl BMX Kinase Btk c-Fms c-Kit c-Met/HGFR Discoidin Domain Receptor DYRK EGFR Ephrin Receptor FAK FGFR FLT3 IGF-1R Insulin Receptor IRAK Itk PDGFR PKA Pyk2 ROS Src Syk TAM Receptor Trk Receptor VEGFR
Stem Cell/Wnt >
Casein Kinase ERK Gli GSK-3 Hedgehog Hippo (MST) JAK Notch Oct3/4 PKA Porcupine ROCK sFRP-1 Smo STAT TGF-beta/Smad Wnt YAP β-catenin γ-secretase
TGF-beta/Smad >
TGF-beta/Smad PKC ROCK TGF-β Receptor
Vitamin D Related >
VD/VDR
Others >
Androgen Receptor Aromatase Estrogen Receptor/ERR Progesterone Receptor Thyroid Hormone Receptor Others

Sutimlimab

Sutimlimab, a first-in-class complement protein component 1, s subcomponent (C1s) inhibitor, can be used for the research of cold agglutinin disease. C1s is a serine protease which cleaves C4 and C2 to form the C3 convertase[1].

  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Mirococept

Mirococept (APT070) is an antibody targeting to complement system C3b/C4b, as well as a membrane-localizing C3 convertase inhibitor. Mirococept reduces the release of C-peptide and pro-inflammatory cytokines, and reduces the infiltration of inflammatory cells. Mirococept reduces intraislet inflammation, which is beneficial to islet transplantation. Mirococept also inhibits increased intestinal and pulmonary vascular permeability to reduce neutrophil influx[1][2].

  • CAS Number: 507453-82-9
  • MF:
  • MW:
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Lampalizumab

Lampalizumab (RG 7417) is a humanised monoclonal antibody targeting complement Factor D in the alternative complement pathway. Lampalizumab binds an exosite and sterically blocks Factor B access to the active site. Lampalizumab can be used for age-related macular degeneration (AMD) research[1][2].

  • CAS Number: 1278466-20-8
  • MF:
  • MW: 46.96 (kDa)
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Vesencumab

Vesencumab (MNRP-1685A) is IG1 antibody against neuropilin-1 (NRP-1). Vesencumab binds to NRP-1 and prevents the subsequent coupling of NRP-1 to VEGFR-2. Vesencumab has anti-angiogenic and anti-neoplastic activities. Vesencumab can be used in the research of metastatic solid tumors, including ovarian cancer[1][2].

  • Density: N/A
  • Boiling Point: N/A
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  • Flash Point: N/A

Compstatin control peptide

Compstatin control peptide is a complement inhibitor.

  • CAS Number: 301544-78-5
  • MF: C66H101N23O17
  • MW: 1488.652
  • Catalog: Complement System
  • Density: 1.5±0.1 g/cm3
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Zilucoplan

Zilucoplan (RA101495), a 15-amino acid macrocyclic peptide, is a potent complement component 5 (C5) inhibitor. Zilucoplan can be used in research of immune-mediated necrotising myopathy (IMNM)[1][2].

  • CAS Number: 1841136-73-9
  • MF: (C2H4O)nC126H186N24O32
  • MW:
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Eculizumab

Eculizumab (Anti-Human C5, Humanized Antibody) is a long-acting humanized monoclonal antibody targeted against complement C5. Eculizumab inhibits the cleavage of C5 into C5a and C5b and hence inhibits deployment of the terminal complement system including the formation of membrane attack complex (MAC). Eculizumab has the potential for haemolysis research[1].

  • CAS Number: 219685-50-4
  • MF:
  • MW:
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

FD-IN-1

FD-IN-1 (Compound 12) is a factor D (FD) inhibitor with an IC50 of 12 nM. Complement FD, a highly specific S1 serine protease, plays a central role in the alternative complement pathway of the innate immune system. FD-IN-1 also inhibits factor XIa (FXIa) and Tryptase β2 with IC50s of 7.7 and 6.5µM, respectively[1].

  • CAS Number: 1646682-14-5
  • MF: C23H23NO4
  • MW: 377.43
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

C3a (70-77) trifluoroacetate salt

C3a (70-77) is an octapeptide corresponding to the COOH terminus of C3a, exhibits the specificity and 1 to 2% biologic activities of C3a.

  • CAS Number: 63555-63-5
  • MF: C35H61N13O10
  • MW: 823.94000
  • Catalog: Peptides
  • Density: 1.44 g/cm3
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Dexamethasone-d4

Dexamethasone-d4 is deuterium labeled Dexamethasone. Dexamethasone (Hexadecadrol) is a glucocorticoid receptor agonist. Dexamethasone also significantly decreases CD11b, CD18, and CD62L expression on neutrophils, and CD11b and CD18 expression on monocytes. Dexamethasone is highly effective in the control of COVID-19 infection. Dexamethasone inhibits production of exosomes containing inflammatory microRNA-155 in lipopolysaccharide-induced macrophage inflammatory responses.

  • CAS Number: 2305607-27-4
  • MF: C22H25D4FO5
  • MW: 396.49
  • Catalog: Bacterial
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

(2S)-2-[methyl(prop-2-enoxycarbonyl)amino]propanoic acid

N-((Allyloxy)carbonyl)-N-methyl-L-alanine is a Alanine derivative. N-((Allyloxy)carbonyl)-N-methyl-L-alanine can be used for the synthesis of inhibitors of complement factor D. Complement factor D inhibitors can be used in the research of immune system related disease[1].

  • CAS Number: 918531-01-8
  • MF: C8H13NO4
  • MW: 187.19300
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Tesidolumab

Tesidolumab (LFG316) is a fully-human IgG1/λ anti-C5 monoclonal antibody of 143 kDa (without glycosylation). Tesidolumab (LFG316) blocks cleavage of C5 and prevents subsequent formation of the membrane attack complex[1].

  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Pegcetacoplan

Pegcetacoplan is a pegylated complement C3 inhibitor peptide. Pegcetacoplan acts effect by binding with complement component 3 (C3) and its activation fragment C3b. Pegcetacoplan can be used for the research of complement-mediated diseases, including age-related macular degeneration, C3 glomerulopathy, Geographic atrophy (GA) and autoimmune haemolytic anaemia[1][2].

  • CAS Number: 2019171-69-6
  • MF: (C2H4O)nC170H248N50O47S4
  • MW:
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

IONIS-FB-LRx

IONIS-FB-LRx is a specific antisense oligonucleotide (ASO) targeting complement factor B (CFB). IONIS-FB-LRx effectively reduces circulating levels of CFB. IONIS-FB-LRx can be used for geographic atrophy (GA) research[1][2].

  • Density: N/A
  • Boiling Point: N/A
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  • Flash Point: N/A

AMY-101

AMY-101 (Cp40), a peptidic inhibitor of the central complement component C3 (KD = 0.5 nM), inhibits naturally occurring periodontitis in non-human primates (NHPs). AMY-101 (Cp40) exhibits a favorable anti-inflammatory activity in models with COVID-19 severe pneumonia with systemic hyper inflammation[1][2].

  • CAS Number: 1427001-89-5
  • MF: C83H117N23O18S2
  • MW: 1789.11
  • Catalog: SARS-CoV
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

C5aR-IN-1

C5aR-IN-1 is a potent inhibitor of C5aR. Increased level of C5a has been associated with disorders such as autoimmune disorders and inflammatory disorders. C5aR-IN-1 has the potential for the research of inflammation diseases (extracted from patent WO2022028586A1, compound 47)[1].

  • CAS Number: 2761048-02-4
  • MF: C36H39F4N3O2
  • MW: 621.71
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

C5aR-IN-2

C5aR-IN-2 is a potent inhibitor of C5aR. Increased level of C5a has been associated with disorders such as autoimmune disorders and inflammatory disorders. C5aR-IN-2 has the potential for the research of inflammation diseases (extracted from patent WO2022028586A1, compound 49)[1].

  • CAS Number: 2761048-06-8
  • MF: C36H40FN5O2
  • MW: 593.73
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Riliprubart

Riliprubart (SAR445088) is an anti-C1s humanized monoclonal antibody that inhibits activated C1s in the proximal portion of the classical complement system. Riliprubart selectively inhibits activated C1s and prevents the enzymatic action of C1 on its substrates C4 and C2, thus inhibiting the formation of the classical pathway C3 convertase, C4b2a[1].

  • Density: N/A
  • Boiling Point: N/A
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C5a Anaphylatoxin (human) trifluoroacetate salt

C5a Anaphylatoxin (human) is a pro-inflammatory peptide and a leukocyte chemoattractant. C5a Anaphylatoxin (human) can be used to study inflammation and immunity, such as allergic asthma[1][2].

  • CAS Number: 1816940-05-2
  • MF: C17H19N3O4
  • MW: 329.350
  • Catalog: Complement System
  • Density: 1.3±0.1 g/cm3
  • Boiling Point: 550.4±52.0 °C at 760 mmHg
  • Melting Point: N/A
  • Flash Point: 260.6±23.0 °C

Citrostadienol

Citrostadienol is a steroid compound with anti-inflammatory and anticomplementary activities. Citrostadienol demonstrates inhibition activities on classical complement pathway (IC50 of 46 nM)[1].

  • CAS Number: 474-40-8
  • MF: C30H50O
  • MW: 426.71700
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Avacopan

Avacopan (CCX168) is a potent, selective and orally available complement 5a receptor inhibitor with an IC50 of 0.1 nM.

  • CAS Number: 1346623-17-3
  • MF: C33H35F4N3O2
  • MW: 581.64400
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

1-Piperidinecarboxamide, 4-[(benzo[b]thien-3-ylcarbonyl)[2-(4-chlorophenyl)ethyl]amino]-N-(2,4-difluorophenyl)-

CP-447697 is a lipophilic C5a receptor antagonist with an IC50 value of 31 nM. CP-447697 can be used for the research of inflammation[1].

  • CAS Number: 1092847-21-6
  • MF: C29H26ClF2N3O2S
  • MW: 554.05
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Vemircopan

Vemircopan is a complement factor D inhibitor[1].

  • CAS Number: 2086178-00-7
  • MF: C29H28BrN7O3
  • MW: 602.48
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

C5aR-IN-3

C5aR-IN-3 is a potent inhibitor of C5aR. Increased level of C5a has been associated with disorders such as autoimmune disorders and inflammatory disorders. C5aR-IN-3 has the potential for the research of inflammation diseases (extracted from patent WO2022028586A1, compound 89)[1].

  • CAS Number: 2761048-50-2
  • MF: C36H40FN5O3
  • MW: 609.73
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Vilobelimab

Vilobelimab (CaCP-29, IFX-1) is a monoclonal anti-C5a antibody to the allergen C5a, a pro-inflammatory complement division product that plays a central role in mediating organ dysfunction. Vilobelimab acts as a C5a inhibitor, inhibiting neutrophil activation, chemotaxis, and reducing inflammatory signalling, and may be used in studies related to sepsis, COVID-19, etc[1].

  • Density: N/A
  • Boiling Point: N/A
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  • Flash Point: N/A

BR103

BR103 is a potent, metabolically stable and highly selective small molecule agonist of complement C3a receptor (C3aR) with EC50 of 22 ± 8  nM; displays high selectivity for C3aR over C5aR; induces paw oedema and mast cell activation in vivo in rats.

  • CAS Number: 1434873-26-3
  • MF: C24H28N6O3
  • MW: 448.527
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Cemdisiran

Cemdisiran is an N-acetylgalactosamine (GalNAc) conjugated siRNA for the treatment of complement-mediated diseases by suppressing liver production of complement 5 (C5) protein.

  • CAS Number: 1436858-07-9
  • MF: C78H140N11O34P
  • MW: 1806.97
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Lipoteichoic Acid

Lipoteichoic acid, a cell wall component of Staphylococcus aureus, activates the complement system via C3 induction and CD55 inhibition[1].

  • CAS Number: 56411-57-5
  • MF:
  • MW:
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

JPE-1375

JPE-1375 is a complement C5a receptor 1 (C5aR1) antagonist. JPE-1375 effectively inhibits polymorphonuclear leukocyte mobilization (EC50=6.9 µM) and reduces TNF levels (EC50=4.5 µM) in mice. JPE-1375 can be used in studies of autoimmune and inflammatory diseases[1].

  • CAS Number: 1254036-23-1
  • MF: C49H63FN10O9
  • MW: 955.08
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

JR14a

Novel potent and selective antagonist of human Complement C3a receptor

  • CAS Number: 2411440-41-8
  • MF: C25H26Cl2N4O3S
  • MW: 533.468
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A