Name: VX-803 (M4344)
Brand: Selleck Chemicals
SKU: S9639
Rating: 5 (4 reviews)

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.

VX-803 (M4344) Chemical Structure

CAS: 1613191-99-3

Selleck's VX-803 (M4344) has been cited by 4 publications

Purity & Quality Control

Batch: S963901 DMSO] 15 mg/mL] false] Water] Insoluble] false] Ethanol] Insoluble] false Purity: 99.99%

99.99

VX-803 (M4344) Related Products

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Signaling Pathway

ATM/ATR Signaling Pathway

Choose Selective ATM/ATR Inhibitors

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
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 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]
Animal Research	Animal Models	Rag2 mice
	Dosages	10 or 20 mg/kg
	Administration	o.g.

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
Clinical Trial Information (data from https://clinicaltrials.gov, updated on 2024-01-11)
NCT04149145	Withdrawn	Ovarian Cancer Recurrent	University of Alabama at Birmingham	May 2023	Phase 1
NCT04655183	Withdrawn	Advanced Solid Tumor\|Breast Cancer	EMD Serono Research & Development Institute Inc.\|Merck KGaA Darmstadt Germany\|EMD Serono	December 1 2020	Phase 1\|Phase 2

References

Chemical Information & Solubility

Molecular Weight	541.55	Formula	C₂₅H₂₉F₂N₉O₃
CAS No.	1613191-99-3	SDF	--
Smiles	C1CN(CCC1C(=O)N2CCN(CC2)C3COC3)C4=C(C=NC=C4NC(=O)C5=C6N=CC(=CN6N=C5N)F)F
Storage (From the date of receipt)	3 years -20°C powder	Storage of Stock Solutions Aliquot the stock solutions to avoid repeated freeze-thaw cycles	1 year-80°Cin solvent
Storage (From the date of receipt)	3 years -20°C powder		1 month-20°Cin solvent

In vitro
Batch:

DMSO : 15 mg/mL ( (27.69 mM)； Moisture-absorbing DMSO reduces solubility. Please use fresh DMSO.)

Water : Insoluble

Ethanol : Insoluble

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In vivo
Batch:

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In vivo Formulation Calculator

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Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH₂O, mix and clarify.

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Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

Handling Instructions

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