2. Metabolic Enzyme/Protease Autophagy Anti-infection
  3. Cathepsin Autophagy Bacterial
  4. E-64

E-64  (Synonyms: Proteinase inhibitor E 64)

Cat. No.: HY-15282 Purity: 99.95%
COA Handling Instructions

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E-64 (Proteinase inhibitor E 64) is a potent irreversible inhibitor against general cysteine proteases with IC50 of 9 nM for papain.

For research use only. We do not sell to patients.

E-64 Chemical Structure

E-64 Chemical Structure

CAS No. : 66701-25-5

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Solid + Solvent (Highly Recommended)
10 mM * 1 mL in DMSO
ready for reconstitution
 USD 66 In-stock
Solution
10 mM * 1 mL in DMSO USD 66 In-stock
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5 mg USD 60 In-stock
10 mg USD 102 In-stock
25 mg USD 216 In-stock
50 mg USD 360 In-stock
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Based on 11 publication(s) in Google Scholar

E-64 Related Antibodies

Top Publications Citing Use of Products

    E-64 purchased from MedChemExpress. Usage Cited in: Dev Comp Immunol. 2018 Jan;78:114-123.  [Abstract]

    The specific activity of the Ap-cathL. E64 is used to inhibit the Ap-cathL activitys.

    View All Cathepsin Isoform Specific Products:

    View All Isoforms
    Cathepsin B Cathepsin C Cathepsin D Cathepsin E Cathepsin K Cathepsin L Cathepsin S

    • Biological Activity

    • Protocol

    • Purity & Documentation

    • References

    • Customer Review

    Description

    E-64 (Proteinase inhibitor E 64) is a potent irreversible inhibitor against general cysteine proteases with IC50 of 9 nM for papain.

    IC50 & Target

    cathepsin K

     

    cathepsin L

     

    In Vitro

    E-64 (Proteinase inhibitor E 64) is a cathepsin B-specific inhibitor, and its binding modes with papain, actinidin, cathepsin L, and cathepsin K have been reviewed at the atomic level. E-64 has been widely used as a potent and irreversible (covalent-type) inhibitor for many cysteine proteases such as papain, ficin, actinidin, cathepsin B and L[1]. The S.cervi adult parasites are incubated in the Kreb's Ringer bicarbonate (KRB) maintenance medium for 8 h at 37°C, 5% CO2 with 5, 10, 20 and 40 μM concentration of E-64. E-64 shows a concentration and time dependent decrease in motility and viability of the parasites (EC50=16 μM)[2].

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

    E-64 Related Antibodies
    In Vivo

    A broad spectrum of expression of CD4 and CD19 is found exists in both the islets and pancreatic lymph nodes (PLNs) and that anti-serpin B13 mAb exposure causes a significant shift that favored cells expressing low-to-intermediate amounts of these markers. However, this shift is abolished in animals that receive anti-serpin B13 mAb in the presence of the protease inhibitor E-64 (Proteinase inhibitor E 64), which maintains its blocking activity under the experimental conditions used[3]. Dahl salt-sensitive (SS) rats are fed an 8% high salt NaCl diet and intravenously infused with the irreversible cysteine cathepsin inhibitor E-64 (1 mg/day) or the vehicle (control). Both the control and E-64 infused groups develope significant hypertension and kidney damage, and no difference of the mean arterial pressure and the hypertension-associated albuminuria is observed between the groups[4].

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

    357.41

    Formula

    C15H27N5O5
    CAS No.
    Appearance

    Solid

    Color

    White to off-white

    SMILES

    O=C([C@H]1O[C@@H]1C(N[C@H](C(NCCCCNC(N)=N)=O)CC(C)C)=O)O
    Shipping

    Room temperature in continental US; may vary elsewhere.
    Storage
    Powder -20°C 3 years
    In solvent -80°C 6 months
    -20°C 1 month
    Solvent & Solubility
    In Vitro: 

    DMSO : 62.5 mg/mL (174.87 mM; Need ultrasonic; Hygroscopic DMSO has a significant impact on the solubility of product, please use newly opened DMSO)

    H2O : 5 mg/mL (13.99 mM; Need ultrasonic)

    Preparing
    Stock Solutions
    Concentration Solvent Mass 1 mg 5 mg 10 mg
    1 mM 2.7979 mL 13.9895 mL 27.9791 mL
    5 mM 0.5596 mL 2.7979 mL 5.5958 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. 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)

    Mass
    =
    Concentration
    ×
    Volume
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    Molecular Weight *

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

    This equation is commonly abbreviated as: C1V1 = C2V2

    Concentration (start)

    C1

    ×
    Volume (start)

    V1

    =
    Concentration (final)

    C2

    ×
    Volume (final)

    V2

    In Vivo:

    Select the appropriate dissolution method based on your experimental animal and administration route.

    For the following dissolution methods, please ensure to first prepare a clear stock solution using an In Vitro approach and then sequentially add co-solvents:
    To ensure reliable experimental results, the clarified stock solution can be appropriately stored based on storage conditions. As for the working solution for in vivo experiments, it is recommended to prepare freshly and use it on the same day.
    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:  10% DMSO    90% Saline

      Solubility: ≥ 2.5 mg/mL (6.99 mM); Clear solution

    • Protocol 2

      Add each solvent one by one:  10% DMSO    40% PEG300    5% Tween-80    45% Saline

      Solubility: ≥ 2.08 mg/mL (5.82 mM); Clear solution

      This protocol yields a clear solution of ≥ 2.08 mg/mL (saturation unknown).

      Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (20.8 mg/mL) to 400 μL PEG300, and mix evenly; then add 50 μL Tween-80 and mix evenly; then add 450 μL Saline to adjust the volume to 1 mL.

      Preparation of Saline: Dissolve 0.9 g sodium chloride in ddH₂O and dilute to 100 mL to obtain a clear Saline solution.

    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: 50 mg/mL (139.90 mM); Clear solution; Need ultrasonic

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

    Dosage

    mg/kg

    Animal weight
    (per animal)

    g

    Dosing volume
    (per animal)

    μL

    Number of animals

    Recommended: Prepare an additional quantity of animals to account for potential losses during experiments.
    Please enter your animal formula composition:
    %
    DMSO +
    % 
    +
    %
    Tween-80 +
    %
    Saline
    Recommended: Keep the proportion of DMSO in working solution below 2% if your animal is weak.
    The co-solvents required include: DMSO, . All of co-solvents are available by MedChemExpress (MCE). , Tween 80. All of co-solvents are available by MedChemExpress (MCE).
    Calculation results:
    Working solution concentration: mg/mL
    Method for preparing stock solution: mg drug dissolved in μL  DMSO (Stock solution concentration: mg/mL).
    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).
    Method for preparing in vivo working solution for animal experiments: Take μL DMSO stock solution, add μL . μL , mix evenly, next add μL Tween 80, mix evenly, then add μL Saline.
     If the continuous dosing period exceeds half a month, please choose this protocol carefully.
    Please ensure that the stock solution in the first step is dissolved to a clear state, and add co-solvents in sequence. You can use ultrasonic heating (ultrasonic cleaner, recommended frequency 20-40 kHz), vortexing, etc. to assist dissolution.
    Purity & Documentation

    Purity: 99.96%

    COA (243 KB) HNMR (207 KB) LCMS (113 KB)

    Handling Instructions (2659 KB)
    References
    Kinase Assay
    [2]

    The Cathepsin B activity is determined using Z-Arg-Arg-4mβNA as substrate with slight modifications. The crude extract is pre-incubated at 37°C for 5 min in 50 mM sodium acetate buffer, pH 5.0 containing 1 mM EDTA and 5 mM DTT. The substrate (final concentration, 100 μM) is added to make the final assay volume of 1 mL. The reaction mixture is incubated at 37°C for 30 min. The reaction is terminated by adding equal volume of stopping reagent containing Fast Garnet GBC salt (1 mg/mL), 10 mM pHMB and 50 mM EDTA, pH 6.0. The extraction of product, β-napthylamine (β-NA), is carried out with n-butanol. After complete layer separation, the absorbance is measured in n-butanol layer and activity is calculated using molar extinction coefficient of β-napthylamine solution as 31.5 M/cm per sec at 520 nm. One unit of enzyme activity is defined as the amount of enzyme liberating 1 μmol of βNA per minute at 37°C. The half maximal inhibitory concentration (IC50) is calculated by plotting the graph between the different concentration of E-64 and the % inhibition in cathepsin B activity. Here, IC50 indicates the concentration of the E-64 required to inhibit the parasitic cathepsin B activity by half[2].

    MCE has not independently confirmed the accuracy of these methods. They are for reference only.
    Animal Administration
    [3][4]

    Mice[3]
    The NOD/LtJ and BDC2.5 T cell receptor (TCR) transgenic NOD mice are used to study the effects of treatment with anti-serpin B13 monoclonal antibody (mAb). Four-week-old female NOD/LtJ mice are injected intravenously four times over a period of 10 days with anti-serpin B13 mAb (100 μg/injection). In addition, during the same period, some animals are also injected intraperitoneally with the protease inhibitor E64 at 10 mg/kg/day for several days. Control mice are treated with diluent (a sterilized PBS solution containing 10% DMSO) and control IgG. The solutions containing E64 or DMSO are prepared immediately before use. Twenty-four hours after the last injection, the mice are killed, and cells from their lymphoid organs and pancreatic islets are subjected to FACS analysis.
    Rats[4]
    Seven-week old male Dahl Salt Sensitive rats (SS/JrHsdMcwi) are used. Briefly, 8-week old anesthetized SS rats have their left femoral artery and vein catheterized. Both catheters are fixed and exteriorized from the back of the neck and the arterial line is connected to a heparinized saline infusion pump that is in line with a blood pressure transducer, and the venous line is connected to a saline infusion pump. Animals are allowed 360° movement using a tether-swivel system. This preparation allowed chronic venous infusion and arterial blood pressure measurement in conscious, freely moving rats. A stable baseline blood pressure is obtained for 4 days prior to switching both groups to an 8.0% NaCl diet and the simultaneous addition of E-64 (1 mg/day; 280 mM stock in DMSO) or the vehicle (DMSO in saline) control to the venous catheter. Daily MAP is calculated by averaging MAP taken every min over the beginning 3 h period of the rat sleep cycle.

    MCE has not independently confirmed the accuracy of these methods. They are for reference only.
    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. 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 / DMSO 1 mM 2.7979 mL 13.9895 mL 27.9791 mL 69.9477 mL
    5 mM 0.5596 mL 2.7979 mL 5.5958 mL 13.9895 mL
    10 mM 0.2798 mL 1.3990 mL 2.7979 mL 6.9948 mL
    DMSO 15 mM 0.1865 mL 0.9326 mL 1.8653 mL 4.6632 mL
    20 mM 0.1399 mL 0.6995 mL 1.3990 mL 3.4974 mL
    25 mM 0.1119 mL 0.5596 mL 1.1192 mL 2.7979 mL
    30 mM 0.0933 mL 0.4663 mL 0.9326 mL 2.3316 mL
    40 mM 0.0699 mL 0.3497 mL 0.6995 mL 1.7487 mL
    50 mM 0.0560 mL 0.2798 mL 0.5596 mL 1.3990 mL
    60 mM 0.0466 mL 0.2332 mL 0.4663 mL 1.1658 mL
    80 mM 0.0350 mL 0.1749 mL 0.3497 mL 0.8743 mL
    100 mM 0.0280 mL 0.1399 mL 0.2798 mL 0.6995 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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    E-64 Related Classifications

    Help & FAQs
    • 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.

    Keywords:

    E-6466701-25-5Proteinase inhibitor E 64E64E 64Proteinase inhibitor E64Proteinase inhibitor E-64CathepsinAutophagyBacterialInhibitorinhibitorinhibit

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