DRB
- Product Name
- DRB
- CAS No.
- 53-85-0
- Chemical Name
- DRB
- Synonyms
- DRB;DBR;DRB1;DR beta;HLA-DRB;HLA-DR1B;DR beta 1;DR beta 3;NSC 401575;DRB USP/EP/BP
- CBNumber
- CB0367110
- Molecular Formula
- C12H12Cl2N2O4
- Formula Weight
- 319.14
- MOL File
- 53-85-0.mol
DRB Property
- Melting point:
- 222-224°C
- Boiling point:
- 606.2±65.0 °C(Predicted)
- Density
- 1.5917 (rough estimate)
- refractive index
- 1.6200 (estimate)
- storage temp.
- -20°C
- solubility
- Soluble in DMSO (up to 20 mg/ml)
- pka
- 13.23±0.70(Predicted)
- form
- White solid
- color
- White
- Water Solubility
- Soluble in DMSO to 75mMSoluble in dimethyl sulfoxide, hot ethanol, dimethyl formamide, (1:2) dimethyl formamide:Phosphate buffer saline, water, methanol and pyridine. Slightly soluble in aqueous buffers.
- λmax
- 296nm(lit.)
- BRN
- 39123
- Stability:
- Stable for 1 year from date of purchase as supplied. Solutions in DMSO may be stored at -20°C for up to 3 months.
- InChIKey
- XHSQDZXAVJRBMX-AYLPWXGPSA-N
- CAS DataBase Reference
- 53-85-0
Safety
- Safety Statements
- 24/25
- WGK Germany
- 3
- RTECS
- DD7310000
- HS Code
- 29349990
Hazard and Precautionary Statements (GHS)
- Symbol(GHS)
-
- Signal word
- Warning
- Hazard statements
-
H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation
- Precautionary statements
-
P261Avoid breathing dust/fume/gas/mist/vapours/spray.
P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
N-Bromosuccinimide Price
- Product number
- D1916
- Product name
- 5,6-Dichlorobenzimidazole 1-β-D-ribofuranoside
- Packaging
- 10mg
- Price
- $68.1
- Updated
- 2025/07/31
- Product number
- 287891
- Product name
- 5,6-Dichloro-1-β-D-ribofuranosylbenzimidazole
- Packaging
- 50mg
- Price
- $186
- Updated
- 2025/07/31
- Product number
- D4292
- Product name
- 5,6-Dichlorobenzimidazole 1-beta-D-Ribofuranoside
- Purity
- >98.0%(HPLC)(N)
- Packaging
- 1g
- Price
- $988
- Updated
- 2025/07/31
- Product number
- D4292
- Product name
- 5,6-Dichlorobenzimidazole 1-beta-D-Ribofuranoside
- Purity
- >98.0%(HPLC)(N)
- Packaging
- 100mg
- Price
- $168
- Updated
- 2025/07/31
- Product number
- 10010302
- Product name
- DRB
- Purity
- ≥98%
- Packaging
- 10mg
- Price
- $31
- Updated
- 2024/03/01
DRB Chemical Properties,Usage,Production
Description
DRB (53-85-0) is a classic inhibitor of transcription by RNA polymerase II.?A relatively selective inhibitor of Cdk9 (IC50=3 μM), the kinase of the positive transcription elongation factor b (P-TEF-b) required for processive transcription elongation by RNA polymerase II.1,2?Also inhibits casein kinase II, IC50=4-10 μM.?3?Suppresses the SIRT1/CK2α pathway and enhances the radiosensitivity of human cancer cells.4?Kinase-independent activities of Cdk9 such as glucocorticoid receptor modulation are not inhibited by DRB.5
Chemical Properties
White Solid
Uses
Inhibits casein kinase II and blocks RNA synthesis. An adenosine analog.5,6-Dichlorobenzimidazole riboside is used as an inhibitor of RNA Polymerase II. It is nucleoside analogue and used in research to study the mechanisms of cellular regulation. Further, it inhibits some protein kinases.
Uses
5,6-Dichlorobenzimidazole 1-β-D-ribofuranoside has been used:
- as an inhibitor of RNA polymerase II in mouse melanoma cells
- for the inhibition of cyclin D1 mRNA synthesis in human prostate epithelial cell lines
- in the inhibition of interleukin-2 gene transcription in Jurkat cells
Uses
DRB is an inhibitor of RNA synthesis (causes premature termination of transcription).
Biochem/physiol Actions
5,6-Dichlorobenzimidazole 1-β-D-ribofuranoside (DRB), a nucleoside analog that halts mRNA synthesis by phosphorylation of the C-terminal domain of RNA polymerase II, making it inactive. It also interferes with the DNA topoisomerase II, may modulate response to cytokines and blocks the human immunodeficiency virus (HIV) via RNA modification. It also inhibits cyclin-dependent kinases (CDKs) 7 and 9 and favors apoptosis in leukemic cells. It may serve as a therapeutic agent in treating cancer.
in vivo
5,6-Dichlorobenzimidazole riboside (2.0-3.0 mg/0.25 mL water, ?intraperitoneally injected twice a day for 5 days) does not inhibit the multiplication of the PR8 strain of influenza virus in mice[7].
References
[1] SONJA BAUMLI L N J Jane A Endicott. Halogen bonds form the basis for selective P-TEFb inhibition by DRB.[J]. Chemistry & biology, 2010: 931-936. DOI:10.1016/j.chembiol.2010.07.012
[2] YUKI YAMAGUCHI Hiroshi H Tadashi Wada. Interplay between positive and negative elongation factors: drawing a new view of DRB[J]. Genes to Cells, 2001, 3 1: 9-15. DOI:10.1046/j.1365-2443.1998.00162.x
[3] ZANDOMENI R O. Kinetics of inhibition by 5,6-dichloro-1-beta-D-ribofuranosylbenzimidazole on calf thymus casein kinase II.[J]. Biochemical Journal, 1989, 262 2: 469-473. DOI:10.1042/bj2620469
[4] ZHI-QIANG WANG. Inhibition of P-TEFb by DRB suppresses SIRT1/CK2α pathway and enhances radiosensitivity of human cancer cells.[J]. Anticancer research, 2014, 34 12: 6981-6989.
[5] RONG ZHU, *. A Kinase-Independent Activity of Cdk9 Modulates Glucocorticoid Receptor-Mediated Gene Induction[J]. Biochemistry Biochemistry, 2014, 53 11: 1753-1767. DOI:10.1021/bi5000178
DRB Preparation Products And Raw materials
Raw materials
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