| Field | Specification |
|---|---|
| Applications | |
| Molecular weight | |
| Molecular formula | C28H29Cl2F3N4O4 |
| Purity | |
| SMILES | |
| Form | Solid |
| Storage | |
| Shipping | |
| Catalog no. (Mfr.) | |
| Main SKU |
Compound Overview
HTH-01-091 TFA is a potent and selective inhibitor of maternal embryonic leucine zipper kinase (MELK), with an IC50 of 10.5 nM. It also inhibits PIM1/2/3, RIPK2, DYRK3, smMLCK, and CLK2, and can be used in breast cancer research[1]. It is supplied as a light yellow to yellow solid (C28H29Cl2F3N4O4, MW 613.46) at 98.01% purity.
Physical & Chemical Properties
| Molecular Formula | C28H29Cl2F3N4O4 |
|---|---|
| Molecular Weight | 613.46 g/mol |
| Purity | 98.01% |
| Appearance | Solid |
| Color | Light yellow to yellow |
| SMILES | O=C1N([C@H]2CC[C@H](CN(C)C)CC2)C3=C(CN1)C=NC4=CC=C(C5=CC(Cl)=C(O)C(Cl)=C5)C=C34.OC(C(F)(F)F)=O |
| Signaling Pathway | PI3K/Akt/mTOR; Protein Tyrosine Kinase/RTK; JAK/STAT Signaling; Cell Cycle/DNA Damage; Stem Cell/Wnt; Apoptosis |
| Solubility | In Vitro: DMSO: 100 mg/mL (163.01 mM; Requires sonication; Hygroscopic DMSO has a significant impact on the solubility of product, please use newly opened DMSO) |
| Storage | Powder: -20°C, 3 years; 4°C, 2 years. In solvent: -80°C, 6 months; -20°C, 1 month. |
| Shipping | Room temperature in continental US; may vary elsewhere. |
Biological Activity
IC50 & Target
IC50: 10.5 nM (MELK), 41.8 nM (DYRK3), 42.5 nM (RIPK2), 60.6 nM (PIM1), 108.6 nM (smMLCK), 632 nM (mTOR), 962 nM (PIK3CA), 1230 nM (CDK7), 1740 nM (GSK3A)[1]
Literature Cited
Sources cited in this description and in the In Vitro & In Vivo Data tab. Peer-reviewed publications that used this product are listed under References.
Safety
For Research Use Only. Not for use in diagnostic or therapeutic procedures, and not for human or veterinary use. Handle in accordance with the Safety Data Sheet and your institution's chemical hygiene plan.
In Vitro
| Solvent | Solubility | Notes |
|---|---|---|
| DMSO | 100 mg/mL (163.01 mM) | requires sonication; use freshly opened DMSO (absorbed moisture lowers solubility) |
Aliquot the stock solution and store it at -80°C (up to 6 months) or -20°C (up to 1 month); avoid repeated freeze-thaw cycles.
In Vivo
Choose the formulation that suits the animal model and route of administration; percentages are volume ratios of the final working solution. Start from a clear DMSO stock (see In Vitro above), add the co-solvents one at a time in the order listed, mixing after each addition, and prepare the working solution fresh on the day of dosing. If precipitation or phase separation occurs, gentle warming or sonication can help.
Protocol 1
| Composition | 10% DMSO + 40% PEG300 + 5% Tween-80 + 45% saline |
|---|---|
| Result | ≥ 2.5 mg/mL (4.08 mM); clear solution |
| How to prepare | Gives a clear solution at ≥ 2.5 mg/mL (saturation not determined). For 1 mL of working solution: add 100 μL DMSO stock (25.0 mg/mL) to 400 μL PEG300; then 50 μL Tween-80; then 450 μL saline to bring the volume to 1 mL. Saline: dissolve 0.9 g sodium chloride in ddH2O and make up to 100 mL. |
Protocol 2
| Composition | 10% DMSO + 90% (20% SBE-β-CD in saline) |
|---|---|
| Result | ≥ 2.5 mg/mL (4.08 mM); clear solution |
| How to prepare | Gives a clear solution at ≥ 2.5 mg/mL (saturation not determined). For 1 mL of working solution: add 100 μL DMSO stock (25.0 mg/mL) to 900 μL 20% SBE-β-CD in saline. 20% SBE-β-CD in saline: dissolve 2 g SBE-β-CD powder in 10 mL saline until clear (4°C, store up to one week). |
Protocol 3
| Composition | 10% DMSO + 90% Corn Oil |
|---|---|
| Result | ≥ 2.5 mg/mL (4.08 mM); clear solution |
| How to prepare | Gives a clear solution at ≥ 2.5 mg/mL (saturation not determined). Use with caution if continuous dosing will exceed two weeks. For 1 mL of working solution: add 100 μL DMSO stock (25.0 mg/mL) to 900 μL corn oil. |
Data provided by the manufacturer.
In Vitro
Selective inhibition of 4% of the kinases over 90% is seen with HTH-01-091 (1 μM) TFA[1]. HTH-01-091 (0-10 μM, 1 h) TFA is cell permeable and induces MELK degradation[1]. In breast cancer cells, HTH-01-091 (0-10 μM, 3 day) TFA has minor antiproliferative effects[1].
Cell Proliferation Assay[1]
| Cell Line | MDA-MB-468, BT-549, HCC70, ZR-75-1, MCF7, and T-47D cells |
|---|---|
| Concentration | 0, 0.001, 0.01, 0.1, 1.0, and 10 μM |
| Incubation Time | 3 day |
| Result | Showed antiproliferative activities in a panel of breast cancer cell lines, including MDA-MB-468, BT-549, HCC70, ZR-75-1, MCF7, and T-47D cells, with IC50 values of 4.00 μM, 6.16 μM, 8.80 μM, >10 μM, 8.75 μM, and 3.87 μM, respectively. |
Western Blot Analysis[1]
| Cell Line | MDA-MB-468 cells |
|---|---|
| Concentration | 0, 0.1, 1.0, and 10 μM |
| Incubation Time | 1 h |
| Result | Reduced MELK protein levels in MDA-MB-468 cells; Dose-dependently decreased MELK pull-down by streptavidin beads, demonstrating that the compound is cell permeable and binds to MELK in an ATP-competitive fashion. Had no effect on ERK1/2 pull-down, showing no binding affinity of HTH-01-091 to ERK1/2. |
Data provided by the manufacturer. Numbered citations refer to the Literature Cited list in the product description.
Need this compound in a format that drops straight into your assay? We can tailor formulation, chemistry, and documentation so your results stay consistent across runs and re-orders.
- Format options: solid or pre-dissolved solution (choose solvent), target concentration, aliquots, light/moisture-protected packaging
- Chemistry options: free base/acid vs salt forms, hydrate/solvate preference, stereoisomer control (single enantiomer or racemate), close analogs
- Add-on labels & handles: D/¹³C/¹⁵N isotopes (LC-MS/internal standards), azide/alkyne or other functional handles for conjugation
- QC & documentation: standard COA or enhanced analytical pack (HPLC/LC-MS/NMR), chiral purity, residual solvents, water content (KF), method-specific specs
- Scale & continuity: mg to gram scale, bulk pricing, lot reservation, repeat-order continuity
To quote quickly, tell us: compound name + CAS/structure (SMILES or mol file), intended assay context, solvent preference, salt/stereochemistry requirements, purity/QC level, and the amount (mg–g).
Can’t find the compound you’re looking for?
Send the CAS or structure and your specs. We can help source it, suggest close equivalents, or discuss custom synthesis with the right QC documentation (RUO).
