1. Immunology/Inflammation
  2. Complement System
  3. Compstatin

Compstatin, a 13-residue cyclic peptide, is a potent inhibitor of the complement system C3 with species specificity. Compstatin binds to baboon C3 and is resistant to proteolytic cleavage in baboon blood (similar to humans). Compstatin inhibits only the activation of primates’ complement system. Compstatin exhibits IC50 values of 63 μM and 12 μM for classical and alterative complement pathway, respectively.

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Compstatin Chemical Structure

Compstatin Chemical Structure

CAS No. : 206645-99-0

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Based on 2 publication(s) in Google Scholar

Other Forms of Compstatin:

Top Publications Citing Use of Products

1 Publications Citing Use of MCE Compstatin

IF

    Compstatin purchased from MedChemExpress. Usage Cited in: J Mater Chem B. 2019, 7, 4207-4216.

    The transfection characterized by inverted fluorescence microscope. GFP-3T3 cells and GFP-MCF-7 cells cultured with 10% FBS were transfected with the addition of C3a or compstatin under the influence of magnetic fields or not.
    • Biological Activity

    • Purity & Documentation

    • References

    • Customer Review

    Description

    Compstatin, a 13-residue cyclic peptide, is a potent inhibitor of the complement system C3 with species specificity. Compstatin binds to baboon C3 and is resistant to proteolytic cleavage in baboon blood (similar to humans). Compstatin inhibits only the activation of primates’ complement system. Compstatin exhibits IC50 values of 63 μM and 12 μM for classical and alterative complement pathway, respectively[1][2][3][4].

    In Vitro

    Compstatin exhibits an in vitro half-life in human blood of about2 hr[2].
    In solution, compstatin forms a β-turn at residues Gln-5–Gly-8 with the disulfide bridge Cys-2–Cys12, residues Ile-1–Val-4, and Thr-13, forming a hydrophobic cluster[3].

    MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

    In Vivo

    Compstatin (21 mg/kg) produces complete inhibition when given as a combination of bolus injection and infusion. Compstatin completely inhibits in vivo heparin/protamine-induced complement activation without adverse effects on heart rate or systemic arterial, central venous, and pulmonary arterial pressures[1].
    Compstatin is stable in baboon plasma for more than 24 h[1].
    Pig xenografts survival is significantly longer in the Compstatin perfused group than in the control group[2].

    MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

    Animal Model: Juvenile baboons (P. Anubis) weighing 10.5-28.8 kg[1].
    Dosage: 50, 25 mg/kg 60 min after heparin and 2 min before protamine.
    Administration: A bolus injection.
    Result: Completely inhibited complement activation induced by heparin–protamine complexes.
    Molecular Weight

    1550.77

    Formula

    C66H99N23O17S2

    CAS No.
    Appearance

    Solid

    Color

    White to off-white

    Sequence

    Ile-Cys-Val-Val-Gln-Asp-Trp-Gly-His-His-Arg-Cys-Thr-NH2 (Disulfide bridge: Cys2-Cys12)

    Sequence Shortening

    ICVVQDWGHHRCT-NH2 (Disulfide bridge: Cys2-Cys12)

    Shipping

    Room temperature in continental US; may vary elsewhere.

    Storage

    Sealed storage, away from moisture and light

    Powder -80°C 2 years
    -20°C 1 year

    *In solvent : -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture and light)

    Solvent & Solubility
    In Vitro: 

    H2O : 100 mg/mL (64.48 mM; Need ultrasonic)

    Preparing
    Stock Solutions
    Concentration Solvent Mass 1 mg 5 mg 10 mg
    1 mM 0.6448 mL 3.2242 mL 6.4484 mL
    5 mM 0.1290 mL 0.6448 mL 1.2897 mL
    View the Complete Stock Solution Preparation Table

    * Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
    Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture and light). When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.

    * Note: If you choose water as the stock solution, please dilute it to the working solution, then filter and sterilize it with a 0.22 μm filter before use.

    • Molarity Calculator

    • Dilution Calculator

    Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)

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    Concentration (start) × Volume (start) = Concentration (final) × Volume (final)

    This equation is commonly abbreviated as: C1V1 = C2V2

    Concentration (start)

    C1

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    In Vivo:

    For the following dissolution methods, please prepare the working solution directly. It is recommended to prepare fresh solutions and use them promptly within a short period of time.
    The percentages shown for the solvents indicate their volumetric ratio in the final prepared solution. If precipitation or phase separation occurs during preparation, heat and/or sonication can be used to aid dissolution.

    • Protocol 1

      Add each solvent one by one:  PBS

      Solubility: 100 mg/mL (64.48 mM); Clear solution; Need ultrasonic

    In Vivo Dissolution Calculator
    Please enter the basic information of animal experiments:

    Dosage

    mg/kg

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    (per animal)

    g

    Dosing volume
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    Number of animals

    Recommended: Prepare an additional quantity of animals to account for potential losses during experiments.
    Calculation results:
    Working solution concentration: mg/mL
    This product has good water solubility, please refer to the measured solubility data in water/PBS/Saline for details.
    The concentration of the stock solution you require exceeds the measured solubility. The following solution is for reference only.If necessary, please contact MedChemExpress (MCE).
    Purity & Documentation
    References

    Complete Stock Solution Preparation Table

    * Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
    Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture and light). When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.

    Optional Solvent Concentration Solvent Mass 1 mg 5 mg 10 mg 25 mg
    H2O 1 mM 0.6448 mL 3.2242 mL 6.4484 mL 16.1210 mL
    5 mM 0.1290 mL 0.6448 mL 1.2897 mL 3.2242 mL
    10 mM 0.0645 mL 0.3224 mL 0.6448 mL 1.6121 mL
    15 mM 0.0430 mL 0.2149 mL 0.4299 mL 1.0747 mL
    20 mM 0.0322 mL 0.1612 mL 0.3224 mL 0.8061 mL
    25 mM 0.0258 mL 0.1290 mL 0.2579 mL 0.6448 mL
    30 mM 0.0215 mL 0.1075 mL 0.2149 mL 0.5374 mL
    40 mM 0.0161 mL 0.0806 mL 0.1612 mL 0.4030 mL
    50 mM 0.0129 mL 0.0645 mL 0.1290 mL 0.3224 mL
    60 mM 0.0107 mL 0.0537 mL 0.1075 mL 0.2687 mL

    * Note: If you choose water as the stock solution, please dilute it to the working solution, then filter and sterilize it with a 0.22 μm filter before use.

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    Compstatin Related Classifications

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    • Do most proteins show cross-species activity?

      Species cross-reactivity must be investigated individually for each product. Many human cytokines will produce a nice response in mouse cell lines, and many mouse proteins will show activity on human cells. Other proteins may have a lower specific activity when used in the opposite species.

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