| Size | Price | Stock | Qty |
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| 50mg |
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| 100mg |
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| Other Sizes |
| Targets |
PEGs
As a PEG-based PROTAC linker, HO-PEG18-OH does not have a specific biological target itself but serves as a structural component in PROTAC molecules. The PEG category of linkers is used to connect the E3 ubiquitin ligase ligand to the target protein ligand in PROTAC design. In this context, one ligand binds to an E3 ubiquitin ligase and the other binds to the target protein; these two ligands are joined by the linker to form PROTACs. The intracellular ubiquitin-proteasome system is then utilized by PROTACs to specifically destroy target proteins. |
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| ln Vitro |
One ligand is for an E3 ubiquitin ligase, and the other is for the target protein; these two ligands are joined by a linker to form PROTACs. The intracellular ubiquitin-proteasome system is utilized by PROTACs to specifically destroy target proteins[1].
HO-PEG18-OH functions as a linker component in in vitro PROTAC synthesis and bioconjugation applications. The PEG18 spacer enhances water solubility and provides molecular flexibility, which is critical for the formation of the ternary complex between the target protein, PROTAC, and E3 ligase. In vitro studies typically involve conjugation of this linker to various ligands to evaluate its effectiveness in facilitating protein degradation. The hydroxyl termini can be activated using standard coupling chemistry (e.g., tosylation, mesylation, or conversion to amine) for conjugation to carboxylate or other functional groups on target ligands. |
| ln Vivo |
In vivo activity data for HO-PEG18-OH as a standalone compound are not reported, as it is utilized as a synthetic linker rather than as a therapeutic agent. The in vivo efficacy of PROTAC molecules incorporating this PEG18 linker would depend on the specific target protein ligand and the overall pharmacokinetic properties of the complete PROTAC construct. As a long hydrophilic PEG-based linker, it may contribute to improved pharmacokinetic properties of conjugated molecules by enhancing solubility, reducing aggregation, and extending circulation time.
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| Enzyme Assay |
In vitro enzyme/receptor binding assays for HO-PEG18-OH typically involve conjugation studies rather than direct binding measurements. The hydroxyl groups can be activated for conjugation to various functional groups, and binding efficiency can be assessed by measuring the degree of conjugation using techniques such as NMR spectroscopy, mass spectrometry, or gel permeation chromatography. Surface plasmon resonance (SPR) may be employed to evaluate the binding of PEGylated molecules to their targets. The PEG18 spacer minimizes steric hindrance, allowing efficient conjugation and maintaining the biological activity of the conjugated molecule.
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| Cell Assay |
In vitro cell-based assays using HO-PEG18-OH typically involve its incorporation into PROTAC molecules, followed by evaluation in cell culture systems. Cells are treated with PROTACs containing this PEG18 linker, and target protein degradation is measured by Western blotting or immunofluorescence. Dose-response experiments are performed to determine optimal concentrations for degradation studies. The long PEG18 chain provides excellent water solubility, facilitating compound handling and delivery in cell culture media.
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| Animal Protocol |
In vivo animal studies using HO-PEG18-OH are conducted as part of the evaluation of complete PROTAC molecules that incorporate this PEG18 linker. Typical protocols involve administering PROTAC constructs to animal models, followed by assessment of pharmacokinetics, biodistribution, or efficacy. The PEG18 spacer is expected to improve the pharmacokinetic profile by increasing hydrophilicity, reducing protein adsorption, and extending circulation time. Dosing regimens vary depending on the specific construct being evaluated and the disease model under study.
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| ADME/Pharmacokinetics |
As a linker rather than a therapeutic drug, comprehensive pharmacokinetic data for HO-PEG18-OH alone are not available. However, the PEG18 moiety is known to enhance aqueous solubility, improve biocompatibility, and increase stability in biological environments. The physicochemical properties include a molecular formula of C36H74O19, molecular weight of 810.96, and a LogP of -3.7, indicating high hydrophilicity. The compound appears as a white to off-white oil. It should be stored at -20°C as a powder for up to 3 years or at 4°C for up to 2 years, protected from light.
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| Toxicity/Toxicokinetics |
The toxicity profile of HO-PEG18-OH as an individual compound is not extensively characterized, as it is primarily used as a research reagent and synthetic linker. The compound is intended for research use only and is not approved for therapeutic use in humans. PEG-based compounds are generally considered to have low toxicity and good biocompatibility, which is why PEGylation is widely used in pharmaceutical formulations. Standard laboratory safety practices, including the use of personal protective equipment, are recommended.
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| References | |
| Additional Infomation |
HO-PEG18-OH (CAS 4445-03-8) has a molecular formula of C36H74O19 and a molecular weight of 810.96. The compound appears as a white to off-white oil with a LogP of -3.7. It is soluble in DMSO and other common organic solvents. The compound should be stored at -20°C as a powder for up to 3 years or at 4°C for up to 2 years, protected from light and moisture. It is stable at ambient temperature for short periods during shipping. It belongs to the PEG category of PROTAC linkers and is used in PROTAC synthesis and bioconjugation applications.
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| Molecular Formula |
C36H74O19
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|---|---|
| Molecular Weight |
810.961
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| Exact Mass |
810.482
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| CAS # |
4445-03-8
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| PubChem CID |
14497137
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| Appearance |
White to off-white oil
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| LogP |
-3.7
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| Hydrogen Bond Donor Count |
2
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| Hydrogen Bond Acceptor Count |
19
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| Rotatable Bond Count |
52
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| Heavy Atom Count |
55
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| Complexity |
606
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| Defined Atom Stereocenter Count |
0
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| SMILES |
C(O)COCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO
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| InChi Key |
WPTOGBNHVWOHQK-UHFFFAOYSA-N
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| InChi Code |
InChI=1S/C36H74O19/c37-1-3-39-5-7-41-9-11-43-13-15-45-17-19-47-21-23-49-25-27-51-29-31-53-33-35-55-36-34-54-32-30-52-28-26-50-24-22-48-20-18-46-16-14-44-12-10-42-8-6-40-4-2-38/h37-38H,1-36H2
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| Chemical Name |
2-[2-[2-[2-[2-[2-[2-[2-[2-[2-[2-[2-[2-[2-[2-[2-[2-(2-hydroxyethoxy)ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]ethanol
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| HS Tariff Code |
2934.99.9001
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| Storage |
Powder -20°C 3 years 4°C 2 years In solvent -80°C 6 months -20°C 1 month Note: This product requires protection from light (avoid light exposure) during transportation and storage. |
| Shipping Condition |
Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)
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| Solubility (In Vitro) |
May dissolve in DMSO (in most cases), if not, try other solvents such as H2O, Ethanol, or DMF with a minute amount of products to avoid loss of samples
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| Solubility (In Vivo) |
Note: Listed below are some common formulations that may be used to formulate products with low water solubility (e.g. < 1 mg/mL), you may test these formulations using a minute amount of products to avoid loss of samples.
Injection Formulations
Injection Formulation 1: DMSO : Tween 80： Saline = 10 : 5 : 85 (i.e. 100 μL DMSO stock solution → 50 μL Tween 80 → 850 μL Saline)(e.g. IP/IV/IM/SC) *Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH ₂ O to obtain a clear solution. Injection Formulation 2: DMSO : PEG300 ：Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL DMSO → 400 μLPEG300 → 50 μL Tween 80 → 450 μL Saline) Injection Formulation 3: DMSO : Corn oil = 10 : 90 (i.e. 100 μL DMSO → 900 μL Corn oil) Example: Take the Injection Formulation 3 (DMSO : Corn oil = 10 : 90) as an example, if 1 mL of 2.5 mg/mL working solution is to be prepared, you can take 100 μL 25 mg/mL DMSO stock solution and add to 900 μL corn oil, mix well to obtain a clear or suspension solution (2.5 mg/mL, ready for use in animals). View More
Injection Formulation 4: DMSO : 20% SBE-β-CD in saline = 10 : 90 [i.e. 100 μL DMSO → 900 μL (20% SBE-β-CD in saline)] Oral Formulations
Oral Formulation 1: Suspend in 0.5% CMC Na (carboxymethylcellulose sodium) Oral Formulation 2: Suspend in 0.5% Carboxymethyl cellulose Example: Take the Oral Formulation 1 (Suspend in 0.5% CMC Na) as an example, if 100 mL of 2.5 mg/mL working solution is to be prepared, you can first prepare 0.5% CMC Na solution by measuring 0.5 g CMC Na and dissolve it in 100 mL ddH2O to obtain a clear solution; then add 250 mg of the product to 100 mL 0.5% CMC Na solution, to make the suspension solution (2.5 mg/mL, ready for use in animals). View More
Oral Formulation 3: Dissolved in PEG400 (Please use freshly prepared in vivo formulations for optimal results.) |
| Preparing Stock Solutions | 1 mg | 5 mg | 10 mg | |
| 1 mM | 1.2331 mL | 6.1655 mL | 12.3311 mL | |
| 5 mM | 0.2466 mL | 1.2331 mL | 2.4662 mL | |
| 10 mM | 0.1233 mL | 0.6166 mL | 1.2331 mL |
*Note: Please select an appropriate solvent for the preparation of stock solution based on your experiment needs. For most products, DMSO can be used for preparing stock solutions (e.g. 5 mM, 10 mM, or 20 mM concentration); some products with high aqueous solubility may be dissolved in water directly. Solubility information is available at the above Solubility Data section. Once the stock solution is prepared, aliquot it to routine usage volumes and store at -20°C or -80°C. Avoid repeated freeze and thaw cycles.
Calculation results
Working concentration： mg/mL；
Method for preparing DMSO stock solution： mg drug pre-dissolved in μL DMSO (stock solution concentration mg/mL). Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug.
Method for preparing in vivo formulation:：Take μL DMSO stock solution, next add μL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH2O，mix and clarify.
(1) Please be sure that the solution is clear before the addition of next solvent. Dissolution methods like vortex, ultrasound or warming and heat may be used to aid dissolving.
(2) Be sure to add the solvent(s) in order.
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