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-18351A
    Indotecan hydrochloride
    		Inhibitor
    Indotecan hydrochloride, an indenoisoquinoline derivative, is a potent Topoisomerase I inhibitor, with IC50s of 300, 1200, 560 nM for P388, HCT116, MCF-7 cell lines, respectively. Indotecan hydrochloride prevents the relaxation of supercoiled DNA and can be used for the research of visceral leishmaniasis.
    Indotecan hydrochloride
  • HY-114983
    Chimmitecan
    		Inhibitor 98.96%
    Chimmitecan ((S)-9-Allyl-10-Hydroxycamptothecin), a novel 9-small-alkyl-substituted lipophilic Camptothecin (HY-16560), is a potent inhibitor of topoisomerase I. Chimmitecan exhibits anticancer activity.
    Chimmitecan
  • HY-N6621A
    Hippeastrine hydrobromide
    		Inhibitor
    Hippeastrine hydrobromide is an active alkaloid that exhibits a good dose-dependent inhibitory effect on topoisomerase I (Top I) with an IC50 of 7.25?μg/mL. Hippeastrine hydrobromide exhibits antiproliferative and anticancer activities.
    Hippeastrine hydrobromide
  • HY-N6054
    Niranthin
    		Inhibitor
    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
  • HY-B0067B
    (R)-Amrubicin
    		Inhibitor
    (R)-Amrubicin ((R)-SM-5887) is an anthracycline that effectively treats lung cancer by intercalating into DNA and inhibiting topoisomerase II activity, which consequently hampers DNA replication as well as RNA and protein synthesis, leading to cell growth inhibition and apoptosis. This compound exhibits superior anti-tumor efficacy compared to traditional anthracycline drugs while lacking the cumulative cardiac toxicity typically associated with this drug class.
    (R)-Amrubicin
  • HY-119458
    Luotonin A
    		Inhibitor
    Luotonin A is an antiviral and antiphytopathogenic fungus agent. Luotonin A has good antiviral activity against tobacco mosaic virus (TMV). Luotonin A also has certain inhibitory activity on topoisomerase I and topoisomerase II. Luotonin A shows antitumor activity.
    Luotonin A
  • HY-13502S
    Mitoxantrone-d8
    		Inhibitor
    Mitoxantrone-d8 (mitozantrone-d8) is the deuterium labeled Mitoxantrone. Mitoxantrone is a topoisomerase II inhibitor and also inhibits protein kinase C (PKC) activity with an IC50 of 8.5 μM.
    Mitoxantrone-d<sub>8</sub>
  • HY-10581AS
    Gatifloxacin-d3 hydrochloride
    		Inhibitor
    Gatifloxacin-d3 (hydrochloride) is the deuterium labeled Gatifloxacin (hydrochloride). Gatifloxacin hydrochloride (AM-1155; BMS-206584; PD135432) is a potent fluoroquinolone antibiotic with broad-spectrum antibacterial activity. Gatifloxacin hydrochloride 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 hydrochloride can be used to treat bacterial conjunctivitis in vivo.
    Gatifloxacin-d<sub>3</sub> hydrochloride
  • HY-124552
    Epolactaene
    		Inhibitor
    Epolactaene is a potent Topoisomerase II and DNA Polymerase inhibitor with IC50 values of 10, 25, 94 µM for Topoisomerase II, DNA Polymerase α, DNA Polymerase β, respectively.
    Epolactaene
  • HY-143266
    Topoisomerase I inhibitor 3
    		Inhibitor
    Topoisomerase I inhibitor 3 (Compound ZML-14) is a topoisomerase I inhibitor and can interact with topoisomerase I-DNA complex. Topoisomerase I inhibitor 3 induces HepG2 cell apoptosis and arrests cell cycle at G2/M phase.
    Topoisomerase I inhibitor 3
  • HY-146816
    NBTIs-IN-6
    		Inhibitor
    NBTIs-IN-6 is a bacterial topoisomerase inhibitor with certain antibacterial activity. Among them, the MIC90 for fluoroquinolone-resistant MRSA was 2 μg/mL.
    NBTIs-IN-6
  • HY-147877
    Topoisomerase II inhibitor 12
    		Inhibitor
    Topoisomerase II inhibitor 12 (Compound 8c) is a topoisomerase II (topo II) inhibitor, working as a DNA non-intercalator. Topoisomerase II inhibitor 12 shows antineoplastic activity.
    Topoisomerase II inhibitor 12
  • HY-162381
    Topoisomerase II inhibitor 19
    		Inhibitor
    Topoisomerase II inhibitor 19 (compound 5h) is a DNA intercalator and topoisomerase II inhibitor (IC50 value of 0.34 μM). Topoisomerase II inhibitor 19 would induce detectable potent damage in ctDNA.
    Topoisomerase II inhibitor 19
  • HY-173478
    OSUAB-0284
    		Inhibitor
    OSUAB-0284 is a bacterial topoisomerase inhibitor. OSUAB-0284 has significant anti-staphylococcal activity, especially against methicillin-resistant Staphylococcus aureus (MRSA). OSUAB-0284 exerts its antibacterial effect by inhibiting bacterial topoisomerase. OSUAB-0284 can be used to study infections caused by drug-resistant bacteria such as MRSA.
    OSUAB-0284
  • HY-B0526S
    Flumequine-13C3
    		Inhibitor
    Flumequine-13C3 is the 13C3 labeled Flumequine. Flumequine (R-802) is a quinolone antibiotic, and acts as a topoisomerase II inhibitor, with an IC50 of 15 μM (3.92 μg/mL).
    Flumequine-<sup>13</sup>C<sub>3</sub>
  • HY-149410
    MSN8C
    		Inhibitor
    MSN8C, an analog of mansonone E, is a novel catalytic inhibitor of human DNA topoisomerase II. MSN8C induces cancer cell apoptosis. MSN8C shows significant anti-tumor cell proliferation activity in vitro.
    MSN8C
  • HY-N10367
    Corydamine
    		Inhibitor
    Corydamine, 3-arylisoquinoline alkaloid, is a potent DNA topoisomerase I/II inhibitor. Corydamine has anti-cancer activity.
    Corydamine
  • HY-143301
    Topoisomerase I inhibitor 4
    		Inhibitor
    Topoisomerase I inhibitor 4 (compound 7a) is a topoisomerase I inhibitor. Topoisomerase I inhibitor 4 inhibits HepG2, A549, MCF-7 and HeLa cancer cells proliferation with IC50s of 1.20, 2.09, 1.56 and 1.92 μM, respectively. Topoisomerase I inhibitor 4 can be used for the research of cancer.
    Topoisomerase I inhibitor 4
  • HY-150045
    TP0480066
    		Inhibitor
    TP0480066 is a selective topoisomerase II inhibitor with IC50s of 1.10 and 62.89 nM for DNA gyrase and topo IV, respectively. TP0480066 shows good activity of againsting various bacterial species including drug-resistant strains. TP0480066 also exhibits potent inhibitory activity to N. gonorrhoeae, can be used in study of gonorrhea.
    TP0480066
  • HY-12888
    AZD5099
    		Inhibitor
    AZD5099, an antibacterial agent, is a potent and selective bacterial topoisomerase II inhibitor. AZD5099 potently inhibits the infections caused by Gram-positive and fastidious Gram-negative bacteria.
    AZD5099
Cat. No. Product Name / Synonyms Species Source
Cat. No. Product Name / Synonyms Application Reactivity
Topoisomerase Isoform Comparison

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