VX-803 (M4344)

Catalog No.S9639 Batch:S963901

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Technical Data

Formula

C25H29F2N9O3
Molecular Weight 541.55 CAS No. 1613191-99-3
Solubility (25°C)* In vitro DMSO 15 mg/mL (27.69 mM)
Water Insoluble
Ethanol Insoluble
* <1 mg/ml means slightly soluble or insoluble.
* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.
* Room temperature shipping (Stability testing shows this product can be shipped without any cooling measures.)

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Biological Activity

Description VX-803 (M4344, ATR inhibitor 2) is an ATP-competitive, orally active, and selective inhibitor of ataxia telangiectasia and Rad3 related (ATR) kinase with Ki of < 150 pM. VX-803 (M4344) potently inhibits ATR-driven phosphorylated checkpoint kinase-1 (P-Chk1) phosphorylation with IC50 of 8 nM. VX-803 (M4344) exhibits potential antineoplastic activity.
Targets
ATR [1]
(Cell-free assay)		 Chk1 [1]
(Cell-free assay)
150 pM(Ki) 8 nM
In vitro

M4344 is determined to be an adenosine triphosphate (ATP)-competitive, highly potent, and tight-binding inhibitor of ATR with a Ki of < 150 pM. Minimal inhibitory activity is observed against a large panel of unrelated protein kinases, with 308 of 312 kinases tested having a measured Ki corresponding to more than 100-fold selectivity. M4344 potently inhibits ATR-driven phosphorylated checkpoint kinase-1 (P-Chk1) phosphorylation with an IC50 of 8 nM. Profiling on a selected set of cancer cell lines shows synergy with several types of DNA damaging chemotherapeutics as well as PARP1/2 and CHK1 inhibitors.[1]
In vivo

In monotherapy efficacy studies M4344 shows tumor stasis to regression in tumor models with alternative lengthening of telomeres (ALT). In combination with PARP inhibitors, tumor regression can be observed in triple-negative breast cancer xenograft models.[1]

Protocol (from reference)

Animal Study:

[3]
  • Animal Models

    Rag2 mice

  • Dosages

    10 or 20 mg/kg

  • Administration

    o.g.

Selleck's VX-803 (M4344) has been cited by 5 publications

Detailed mechanisms for unintended large DNA deletions with CRISPR, base editors, and prime editors [ bioRxiv, 2024, ] PubMed: none
Replicative senescence is ATM driven, reversible, and accelerated by hyperactivation of ATM at normoxia [ bioRxiv, 2024, 2024.06.24.600514] PubMed: 38979390
A Chemical Proteomics Approach to Discover Regulators of Innate Immune Signaling [ Viruses, 2023, 15(5)1112] PubMed: 37243198
ATR inhibition overcomes platinum tolerance associated with ERCC1- and p53-deficiency by inducing replication catastrophe [ NAR Cancer, 2023, 5(1):zcac045] PubMed: 36644397
Immunogenicity of small-cell lung cancer associates with STING pathway activation and is enhanced by ATR and TOP1 inhibition [ Cancer Med, 2022, 10.1002/cam4.5109] PubMed: 35957613

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SHIPPING AND STORAGE
Selleck products are transported at room temperature. If you receive the product at room temperature, please rest assured, the Selleck Quality Inspection Department has conducted experiments to verify that the normal temperature placement of one month will not affect the biological activity of powder products. After collecting, please store the product according to the requirements described in the datasheet. Most Selleck products are stable under the recommended conditions.

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