A-196
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MedKoo CAT#: 407272

CAS#: 1982372-88-2

Description: A-196 is the first potent and selective chemical probe for SUV420H1 and SUV420H2. The in vitro activity of A-196 includes inhibition of SUV420H1 with IC50 = 25 nM and SUV420H2 with IC50 = 144 nM for methylation of H4K20me and greater than 100-fold selectivity over other histone methyltransferases and non-epigenetic targets. In cell assays, A-196 inhibits the di- and tri-methylation of H4K20me in multiple cell lines with IC50 < 1 µM.

Chemical Structure

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A-196
CAS# 1982372-88-2
Product data Instruction

Theoretical Analysis

MedKoo Cat#: 407272
Name: A-196
CAS#: 1982372-88-2
Chemical Formula: C18H16Cl2N4
Exact Mass: 358.08
Molecular Weight: 359.250
Elemental Analysis: C, 60.18; H, 4.49; Cl, 19.74; N, 15.60

Price and Availability

Size Price Availability Quantity
5mg USD 420 2 Weeks
25mg USD 840 2 Weeks
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Synonym: A-196; A 196; A196.

IUPAC/Chemical Name: 6,7-dichloro-N-cyclopentyl-4-(pyridin-4-yl)phthalazin-1-amine

InChi Key: ABGOSOMRWSYAOB-UHFFFAOYSA-N

InChi Code: InChI=1S/C18H16Cl2N4/c19-15-9-13-14(10-16(15)20)18(22-12-3-1-2-4-12)24-23-17(13)11-5-7-21-8-6-11/h5-10,12H,1-4H2,(H,22,24)

SMILES Code: ClC1=C(Cl)C=C(C(C2=CC=NC=C2)=NN=C3NC4CCCC4)C3=C1

Appearance: Solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: Soluble in DMSO, not in water

Shelf Life: >2 years if stored properly

Drug Formulation: This drug may be formulated in DMSO

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001

More Info: Histone H4 lysine 20 methylation is emerging as a crucial modification to ensure genomic integrity both in the absence and presence of genotoxic stress. The majority of histone H4 methylation is detected in the lysine 20 (H4K20) and is evolutionarily conserved from yeast to human. Each methylation state results in distinct biology: dimethylated H4K20 (H4K20me2) is involved in DNA replication and DNA damage repair, and trimethylated H4K20 (H4K20me3) results in silenced heterochromatic regions . Loss of histone H4 lysine 20 trimethylation (H4K20me3) is characteristic of human cancer and a potential prognostic marker in many types of cancers.

Product Data:
Product Data
Instruction:
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Biological target: A-196 is a selective inhibitor of SUV420H1 and SUV420H2 (IC50s = 25 and 144 nM, respectively) that is more than 100-fold selective over other histone methyltransferases and non-epigenetic targets. A-196 has been shown to inhibit the di- and tri-methylation of lysine 20 of histone H4 (H4K20me) in multiple cell lines with IC50 values less than 1 μM.
In vitro activity: A-196 represents a first-in-class chemical probe of SUV4-20 to investigate the role of histone methyltransferases in genomic integrity. A-196 induced a global decrease in H4K20me2 and H4K20me3 and a concomitant increase in H4K20me1. A-196 inhibited 53BP1 foci formation upon ionizing radiation and reduced NHEJ-mediated DNA-break repair but did not affect homology-directed repair. These results demonstrate the role of SUV4-20 enzymatic activity in H4K20 methylation and DNA repair. Reference: Nat Chem Biol. 2017 Mar;13(3):317-324. https://pubmed.ncbi.nlm.nih.gov/28114273/
In vivo activity: To be determined

Solubility Data

Solvent Max Conc. mg/mL Max Conc. mM
Solubility
DMF 10.0 27.84
DMSO 10.0 27.84
Ethanol 2.0 5.57

Preparing Stock Solutions

The following data is based on the product molecular weight 359.25 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL
Formulation protocol: 1. Bromberg KD, Mitchell TR, Upadhyay AK, Jakob CG, Jhala MA, Comess KM, Lasko LM, Li C, Tuzon CT, Dai Y, Li F, Eram MS, Nuber A, Soni NB, Manaves V, Algire MA, Sweis RF, Torrent M, Schotta G, Sun C, Michaelides MR, Shoemaker AR, Arrowsmith CH, Brown PJ, Santhakumar V, Martin A, Rice JC, Chiang GG, Vedadi M, Barsyte-Lovejoy D, Pappano WN. The SUV4-20 inhibitor A-196 verifies a role for epigenetics in genomic integrity. Nat Chem Biol. 2017 Mar;13(3):317-324. doi: 10.1038/nchembio.2282. Epub 2017 Jan 23. PMID: 28114273.
In vitro protocol: 1. Bromberg KD, Mitchell TR, Upadhyay AK, Jakob CG, Jhala MA, Comess KM, Lasko LM, Li C, Tuzon CT, Dai Y, Li F, Eram MS, Nuber A, Soni NB, Manaves V, Algire MA, Sweis RF, Torrent M, Schotta G, Sun C, Michaelides MR, Shoemaker AR, Arrowsmith CH, Brown PJ, Santhakumar V, Martin A, Rice JC, Chiang GG, Vedadi M, Barsyte-Lovejoy D, Pappano WN. The SUV4-20 inhibitor A-196 verifies a role for epigenetics in genomic integrity. Nat Chem Biol. 2017 Mar;13(3):317-324. doi: 10.1038/nchembio.2282. Epub 2017 Jan 23. PMID: 28114273.
In vivo protocol: To be determined

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1: Bromberg KD, Mitchell TR, Upadhyay AK, Jakob CG, Jhala MA, Comess KM, Lasko LM, Li C, Tuzon CT, Dai Y, Li F, Eram MS, Nuber A, Soni NB, Manaves V, Algire MA, Sweis RF, Torrent M, Schotta G, Sun C, Michaelides MR, Shoemaker AR, Arrowsmith CH, Brown PJ, Santhakumar V, Martin A, Rice JC, Chiang GG, Vedadi M, Barsyte-Lovejoy D, Pappano WN. The SUV4-20 inhibitor A-196 verifies a role for epigenetics in genomic integrity. Nat Chem Biol. 2017 Mar;13(3):317-324. doi: 10.1038/nchembio.2282. Epub 2017 Jan 23. PMID: 28114273.