Netropsin diHCl is a small molecule (MGB) minor groove binder that can inhibit the catalytic activity of isolated topoisomerases and interferes with the stability of degradable complexes of topoisomerases II and I in the nucleus. Netropsin diHCl has anti-viral effect against vaccinia virus.

Physicochemical Properties

Molecular Formula	C18H26N10O3.HCL
Molecular Weight	466.92518
Exact Mass	466.196
CAS #	18133-22-7
Related CAS #	1438-30-8;18133-22-7 (HCl);63770-20-7 (Alt. HCl);
PubChem CID	5351456
Appearance	Off-white to yellow solid powder
LogP	2.423
Hydrogen Bond Donor Count	8
Hydrogen Bond Acceptor Count	5
Rotatable Bond Count	9
Heavy Atom Count	32
Complexity	723
Defined Atom Stereocenter Count	0
InChi Key	FSOYOTWCAMRRGU-UHFFFAOYSA-N
InChi Code	InChI=1S/C18H26N10O3.ClH/c1-27-9-11(6-12(27)16(30)23-4-3-14(19)20)26-17(31)13-5-10(8-28(13)2)25-15(29)7-24-18(21)22;/h5-6,8-9H,3-4,7H2,1-2H3,(H3,19,20)(H,23,30)(H,25,29)(H,26,31)(H4,21,22,24);1H
Chemical Name	N-[5-[(3-amino-3-iminopropyl)carbamoyl]-1-methylpyrrol-3-yl]-4-[[2-(diaminomethylideneamino)acetyl]amino]-1-methylpyrrole-2-carboxamide;hydrochloride
HS Tariff Code	2934.99.9001
Storage	Powder-20°C 3 years 4°C 2 years In solvent -80°C 6 months -20°C 1 month Note: Please store this product in a sealed and protected environment (e.g. under nitrogen), avoid exposure to moisture and light.
Shipping Condition	Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

Biological Activity

ln Vitro	Netropsin diHClide binds to dsDNA non-insertively, which may confer antibiotic and antiviral effects. It also attenuates NOS2 induction by obstructing HMGA1 DNA's binding to the core NOS2 promoter, which increases the survival rate of endotoxemia in mice [2]. Because of its strong binding affinity and great structural stability, neraptin dihydrochloride in DNA solution can protect DNA from radiation damage. The Netropsin-DNA complex is not cleaved radiatively by the hydroxyl radical (OH*) produced by ionizing radiation [3].
References	[1]. Netropsin and bis-netropsin analogs as inhibitors of the catalytic activity of mammalian DNA topoisomerase II and topoisomerase cleavable complexes. Biochim Biophys Acta. 1991 Aug 27;1090(1):52-60. [2]. Netropsin improves survival from endotoxaemia by disrupting HMGA1 binding to the NOS2 promoter. Biochem J. 2009 Feb 15;418(1):103-12. [3]. Netropsin, a minor groove binding ligand: a potential radioprotective agent. Radiat Res. 2009 Dec;172(6):698-705. [4]. A review of compounds exhibiting anti-orthopoxvirus activity in animal models. Antiviral Res. 2003 Jan;57(1-2):41-52.
Additional Infomation	A basic polypeptide isolated from Streptomyces netropsis. It is cytotoxic and its strong, specific binding to A-T areas of DNA is useful to genetics research.

Solubility Data

Solubility (In Vitro)

DMSO : ~125 mg/mL (~248.32 mM) H2O : ~20 mg/mL (~39.73 mM)

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 (e.g. IP/IV/IM/SC) Injection Formulation 1: DMSO : Tween 80： Saline = 10 : 5 : 85 (i.e. 100 μL DMSO stock solution → 50 μL Tween 80 → 850 μL Saline) *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). 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)] *Preparation of 20% SBE-β-CD in Saline (4°C，1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution. Injection Formulation 5: 2-Hydroxypropyl-β-cyclodextrin : Saline = 50 : 50 (i.e. 500 μL 2-Hydroxypropyl-β-cyclodextrin → 500 μL Saline) Injection Formulation 6: DMSO : PEG300 : castor oil : Saline = 5 : 10 : 20 : 65 (i.e. 50 μL DMSO → 100 μLPEG300 → 200 μL castor oil → 650 μL Saline) Injection Formulation 7: Ethanol : Cremophor : Saline = 10： 10 : 80 (i.e. 100 μL Ethanol → 100 μL Cremophor → 800 μL Saline) Injection Formulation 8: Dissolve in Cremophor/Ethanol (50 : 50), then diluted by Saline Injection Formulation 9: EtOH : Corn oil = 10 : 90 (i.e. 100 μL EtOH → 900 μL Corn oil) Injection Formulation 10: EtOH : PEG300：Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL EtOH → 400 μLPEG300 → 50 μL Tween 80 → 450 μL 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). Oral Formulation 3: Dissolved in PEG400 Oral Formulation 4: Suspend in 0.2% Carboxymethyl cellulose Oral Formulation 5: Dissolve in 0.25% Tween 80 and 0.5% Carboxymethyl cellulose Oral Formulation 6: Mixing with food powders Note: Please be aware that the above formulations are for reference only. InvivoChem strongly recommends customers to read literature methods/protocols carefully before determining which formulation you should use for in vivo studies, as different compounds have different solubility properties and have to be formulated differently.  (Please use freshly prepared in vivo formulations for optimal results.)

Preparing Stock Solutions		1 mg	5 mg	10 mg
	1 mM	2.1416 mL	10.7082 mL	21.4165 mL
	5 mM	0.4283 mL	2.1416 mL	4.2833 mL
	10 mM	0.2142 mL	1.0708 mL	2.1416 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.