2. Signaling Pathways
  3. Cell Cycle/DNA Damage
  4. Topoisomerase

Topoisomerase

Topoisomerase

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Topoisomerases are enzymes that regulate the overwinding or underwinding of DNA. The winding problem of DNA arises due to the intertwined nature of its double-helical structure. Topoisomerases are isomerase enzymes that act on the topology of DNA. Type I topoisomerase cuts one strand of a DNA double helix, relaxation occurs, and then the cut strand is reannealed. Type I topoisomerases are subdivided into two subclasses: type IA topoisomerases, which share many structural and mechanistic features with the type II topoisomerases, and type IB topoisomerases, which utilize a controlled rotary mechanism. Type II topoisomerase cuts both strands of one DNA double helix, pass another unbroken DNA helix through it, and then reanneal the cut strands. This class is also split into two subclasses: type IIA and type IIB topoisomerases, which possess similar structure and mechanisms.

Topoisomerase Isoform Specific Products:

Topoisomerase Isoform Comparison
Cat. No. Product Name Effect Purity Chemical Structure
  • HY-101064S4
    Fmoc-leucine-15N
    		Inhibitor
    Fmoc-leucine-15N is a 15N-labeled and 13C-labled EIDD-1931. EIDD-1931 (Beta-d-N4-hydroxycytidine; NHC) is a novel nucleoside analog and behaves as a potent anti-virus agent. EIDD-1931 effectively inhibits the replication activity of venezuelan equine ence
    Fmoc-leucine-<sup>15</sup>N
  • HY-114684
    A20832
    		Inhibitor
    A20832 is a specific resolvase inhibitor that blocks both the recombination and topoisomerase activities of resolvase. A20832 inhibits the site-specific recombination reaction mediated by the Tn3-encoded resolvase protein at the strand cleavage step and has no effect on synapsis.
    A20832
  • HY-N6054R
    Niranthin (Standard)
    		Inhibitor
    Niranthin (Standard) is the analytical standard of Niranthin. This product is intended for research and analytical applications. Niranthin, a lignan with a wide spectrum of pharmacological activities. Niranthin is a potent and non-competitive inhibitor of heterodimeric type IB topoisomerase of L. donovani. Niranthin can be used for the research of drug-resistant leishmaniasis research.
    Niranthin (Standard)
  • HY-156464
    Topoisomerase I inhibitor 10
    		Inhibitor
    Topoisomerase I inhibitor 10 (compound 13) is a leishmanial topoisomerase IB inhibitor. Topoisomerase I inhibitor 10 has antileishmanial activity against L. donovani promastigotes, with the IC50 of 27.91 μM.
    Topoisomerase I inhibitor 10
  • HY-10581B
    Gatifloxacin mesylate
    		Inhibitor
    Gatifloxacin mesylate (AM-1155; BMS-206584; PD135432) is a potent fluoroquinolone antibiotic with broad-spectrum antibacterial activity. Gatifloxacin mesylate inhibits bacterial type II topoisomerases (IC50=13.8 μg/ml for S. aureus topoisomerase IV) and E. coli DNA gyrase (IC50 = 0.109 μg/ml). Gatifloxacin mesylate can be used to treat bacterial conjunctivitis in vivo.
    Gatifloxacin mesylate
  • HY-W781148
    Suptopin-2
    		Inhibitor
    Sutopin-2 is a topoisomerase II inhibitor. Suptopin-2 affects cell cycle progression and stability of microtubules. Sutopin-2 induces cell cycle arrest by regulating the nucleocytoplasmic transport of cyclin B1.
    Suptopin-2
  • HY-167671
    BE-10988
    		Inhibitor
    BE-10988 is a DNA topoisomerase inhibitor. BE-10988 inhibits the growth of Doxorubicin (HY-15142A)-resistant and vincristine-resistant P388 mouse leukemia cell lines by increasing the formation of DNA topoisomerase complexes.
    BE-10988
  • HY-10581AS1
    Gatifloxacin-d4 hydrochloride
    		Inhibitor
    Gatifloxacin-d4 (AM-1155-d4; BMS-206584-d4; PD135432-d4) hydrochloride is deuterium-labeled Gatifloxacin (hydrochloride) (HY-10581A).
    Gatifloxacin-d<sub>4</sub> hydrochloride
  • HY-13620
    Elinafide
    		Inhibitor 98.59%
    Elinafide is an anticancer agent with a naphthalimide structure that targets DNA. Elinafide interferes with cell metabolism by inserting a planar ring into the DNA double helix and interacting with enzymes through its side chain.LU-79553 is a DNA-binding topoisomerase II inhibitor. The IC50 value of Elinafide for HT-29 cells is 0.014 μM.
    Elinafide
  • HY-13727AS
    Pixantrone-d8
    		Inhibitor
    Pixantrone-d8 (BBR 2778-d8) is deuterium-labeled Pixantrone (HY-13727A).
    Pixantrone-d<sub>8</sub>
  • HY-N12747
    Dichlorogelignate
    		Inhibitor
    Dichlorogelignate (compound 4) is a selective inhibitor of topoisomerase II (Topo II). Dichlorogelignate has 100% inhibition at 50 μM.
    Dichlorogelignate
  • HY-156516A
    10NH2-11F-Camptothecin TFA
    		Inhibitor
    10NH2-11F-Camptothecin TFA is a Camptothecin (HY-16560) analogue that serves as an ADC cytotoxin for the synthesis of antibody-drug conjugates (ADCs). 10NH2-11F-Camptothecin TFA has anticancer effects (WO2022246576A1; compound 140).
    10NH2-11F-Camptothecin TFA
  • HY-13670A
    Lurtotecan dihydrochloride
    		Inhibitor
    Lurtotecan dihydrochloride (GI147211), a semisynthetic Camptothecin analog, is a topoisomerase I inhibitor. Lurtotecan dihydrochloride has anticancer effects.
    Lurtotecan dihydrochloride
  • HY-152187
    Topoisomerase IIα-IN-5
    		Inhibitor
    Topoisomerase IIα-IN-5 is a topoisomerase II (topo II) α catalytic inhibitor. Topoisomerase IIα-IN-5 intercalates into DNA and binds to the DNA minor groove. Topoisomerase IIα-IN-5 exhibits better efficacy and less genotoxicity than Etoposide (HY-13629).
    Topoisomerase IIα-IN-5
  • HY-169261
    7-Methoxy-9-methylfuro[2,3-b]-quinoline-4,5,8(9H)-trione
    		Inhibitor
    7-Methoxy-9-methylfuro[2,3-b]-quinoline-4,5,8(9H)-trione is a synthetic intermediate that can been used in the synthesis of the alkaloid Acronycidine.
    7-Methoxy-9-methylfuro[2,3-b]-quinoline-4,5,8(9H)-trione
  • HY-14780
    Viquidacin
    		Inhibitor
    Viquidacin (NXL 101) is an antibiotic with inhibitory activity against topoisomerase IV and DNA gyrase. Viquidacin exhibits antibacterial activity against gram positive bacterial by inhibiting the supercoiling, decatenation and relaxation in strains Staphylococcus aureus and Escherichia coli in micromolar levels. Viquidacin inhibits S. aureus wildtype and mutants with MIC of 2-128 mg/L.
    Viquidacin
  • HY-B0330BS1
    Levofloxacin-d3 hydrochloride
    		Inhibitor
    Levofloxacin-d3 ((-)-Ofloxacin-d3) hydrochlorideis deuterium labeled Levofloxacin (hydrochloride). Levofloxacin ((-)-Ofloxacin) hydrochloride is an orally active antibiotic and is active against both Gram-positive and Gram-negative bacteria. Levofloxacin hydrochloride inhibits the DNA gyrase and topoisomerase IV. Levofloxacin hydrochloride can be used for chronic periodontitis, airway inflammation and BK Viremia research. Levofloxacin hydrochloride shows anti-orthopoxvirus activity.
    Levofloxacin-d<sub>3</sub> hydrochloride
  • HY-N11698
    Bakuchicin
    		Inhibitor
    Bakuchicin (Allopsoralen) is a compound that can be found in Psoralea corylifolia. It has certain inhibitory activity against topoisomerase II. In the cell model infected with Simian virus 40 (SV40), the IC50 of Bakuchicin against topoisomerase II is 404 μM. Bakuchicin can be used in the research of the anti-infection field.
    Bakuchicin
  • HY-B1050R
    Gemifloxacin (mesylate) (Standard)
    		Inhibitor
    Gemifloxacin (mesylate) (Standard) is the analytical standard of Gemifloxacin (mesylate). This product is intended for research and analytical applications. Gemifloxacin mesylate (SB-265805S; LB-20304a) is an orally active broad-spectrum quinolone antibacterial antibiotic. Gemifloxacin mesylate inhibits DNA synthesis by inhibiting DNA gyrase and Topoisomerase IV activities. Gemifloxacin mesylate has potent antibacterial activities against gram-positive bacteria in vitro efficacy study, particularly Streptococci and Staphylococci. Gemifloxacin mesylate has been used in the research of respiratory tract infections.
    Gemifloxacin (mesylate) (Standard)
  • HY-16742C
    Gepotidacin hydrochloride
    		Inhibitor
    Gepotidacin hydrochloride is a novel triazaacenaphthylene bacterial type II topoisomerase inhibitor.
    Gepotidacin hydrochloride
Cat. No. Product Name / Synonyms Application Reactivity
Topoisomerase Isoform Comparison

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