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-13562AR
    Banoxantrone dihydrochloride (Standard)
    		Inhibitor
    Banoxantrone (dihydrochloride) (Standard) is the analytical standard of Banoxantrone (dihydrochloride). This product is intended for research and analytical applications. Banoxantrone dihydrochloride is a novel bioreductive agent that can be reduced to a stable, DNA-affinic compound AQ4, which is a potent topoisomerase II inhibitor.
    Banoxantrone dihydrochloride (Standard)
  • HY-13768AR
    Topotecan hydrochloride (Standard)
    		Inhibitor
    Topotecan (hydrochloride) (Standard) is the analytical standard of Topotecan (hydrochloride). This product is intended for research and analytical applications. Topotecan Hydrochloride (SKF 104864A Hydrochloride) is a Topoisomerase I inhibitor with potent antineoplastic activities.
    Topotecan hydrochloride (Standard)
  • HY-185309
    Anti-Trypanosoma cruzi agent-9
    		Inhibitor
    Anti-Trypanosoma cruzi agent-9 is a topoisomerase II inhibitor. Anti-Trypanosoma cruzi agent-9 inhibits the growth of Trypanosoma cruzi and Leishmania donovani.
    Anti-Trypanosoma cruzi agent-9
  • HY-13629S
    Etoposide-d3
    		Inhibitor
    Etoposide-d3 (VP-16-d3) is the deuterium labeled Etoposide (HY-13629). Etoposide (VP-16) is an anti-cancer chemotherapy agent. Etoposide inhibits topoisomerase II, thus stopping DNA replication. Etoposide induces cell cycle arrest, apoptosis and autophagy.
    Etoposide-d<sub>3</sub>
  • HY-100777R
    DACA (Standard)
    		Inhibitor
    DACA (Standard) is the analytical standard of DACA (HY-100777). This product is intended for research and analytical applications. DACA (XR 5000) is a blood-brain barrier-penetrating topoisomerase I and II inhibitor. DACA can be used in the research of colorectal cancer, leukemia and lung cancer.
    DACA (Standard)
  • HY-13761R
    Teniposide (Standard)
    		Inhibitor
    Teniposide (Standard) is the analytical standard of Teniposide. This product is intended for research and analytical applications. Teniposide is a podophyllotoxin derivative, acts as a topoisomerase II inhibitor, and used as a chemotherapeutic agent.
    Teniposide (Standard)
  • HY-182816
    Topoisomerase I-IN-22
    		Inhibitor
    Topoisomerase I-IN-22 is an inhibitor of MRSA DNA Topoisomerase I with an IC50 of 0.85 μg/mL. Topoisomerase I-IN-22 can specifically disrupt the cell membrane structure of MRSA, enter the interior of bacteria and inhibit the activity of DNA Topoisomerase I, thereby interfering with the processes of DNA replication and transcription. Topoisomerase I-IN-22 can be used for the research of MRSA infection.
    Topoisomerase I-IN-22
  • HY-116231
    (S)-Gyramide A
    		Inhibitor
    (S)-Gyramide A is a weak inhibitor of cell proliferation that can target DNA gyrase.
    (S)-Gyramide A
  • HY-100875R
    Bisantrene (Standard)
    		Inhibitor
    Bisantrene (Standard) is the analytical standard of Bisantrene. This product is intended for research and analytical applications. Bisantrene is a highly effective antitumor agent, it exerts its cytotoxicity by affecting DNA intercalation. Bisantrene targets eukaryotic type II topoisomerases. Bisantrene is a substrate of MDR1.
    Bisantrene (Standard)
  • HY-170567
    DNA gyrase/Topo IV-IN-1
    		Inhibitor
    DNA gyrase/Topo IV-IN-1 (Compound 27) is an inhibitor of DNA gyrase and topoisomerase IV, exhibiting antibacterial activity. For Escherichia coli and methicillin-resistant Staphylococcus aureus DNA gyrases, DNA gyrase/Topo IV-IN-1 has an IC50 of 11 and 17 nM respectively, and for topoisomerase IV of Escherichia coli and methicillin-resistant Staphylococcus aureus, the IC50 values are 83 and 21 nM respectively. DNA gyrase/Topo IV-IN-1 can be used for research in the field of anti-infection.
    DNA gyrase/Topo IV-IN-1
  • HY-13555R
    β-Lapachone (Standard)
    		Inhibitor
    β-Lapachone (Standard) is the analytical standard of β-Lapachone. This product is intended for research and analytical applications. β-Lapachone (ARQ-501;NSC-26326) is a naturally occurring O-naphthoquinone, acts as a topoisomerase I inhibitor, and induces apoptosis by inhibiting cell cycle progression.
    β-Lapachone (Standard)
  • HY-160543
    Exatecan-amide-CH2-O-CH2-CH2-OH
    		Inhibitor
    Exatecan-amide-CH2-O-CH2-CH2-OH (Compound 4) is a derivative of Exatecan (HY-13631). Exatecan-amide-CH2-O-CH2-CH2-OH can be used for the research of cell proliferative diseases such as cancer.
    Exatecan-amide-CH2-O-CH2-CH2-OH
  • HY-W654130
    Daunorubicin-13C,d3
    		Inhibitor
    Daunorubicin-13C,d3 is 13C and deuterium labeled Daunorubicin. Daunorubicin (Daunomycin) is a topoisomerase II inhibitor with potent anti-tumor activity. Daunorubicin inhibits DNA and RNA synthesis. Daunorubicin is a cytotoxin that inhibits cancer cell viability and induces apoptosis and necrosis. Daunorubicin is also an anthracycline antibiotic. Daunorubicin can be used in the research of infection and variety of cancers, including leukemia, non-Hodgkin lymphomas, Ewing's sarcoma, Wilms' tumor.
    Daunorubicin-<sup>13</sup>C,d<sub>3</sub>
  • HY-B0395E
    (1S,2R,7S)-Sitafloxacin
    		Inhibitor
    (1S,2R,7S)-Sitafloxacin (DU-6856) is an enantiomer of Sitafloxacin (HY-B0395). (1S,2R,7S)-Sitafloxacin is a topoisomerase inhibitor. (1S,2R,7S)-Sitafloxacin is an antibiotic. (1S,2R,7S)-Sitafloxacin has inhibitory activity against Escherichia coli DNA gyrase (IC50 0.18 μg/mL) and Staphylococcus aureus topoisomerase IV. (1S,2R,7S)-Sitafloxacin has antibacterial activity and can be used in the study of various bacterial infections.
    (1S,2R,7S)-Sitafloxacin
  • HY-173458
    NBTIs-IN-7
    		Inhibitor
    NBTIs-IN-7 (compound 276) is a novel bacterial topoisomerase (NBTIs) inhibitor. NBTIs-IN-7 induces both single- and double-strand DNA strand breaks in the presence of gyrase.
    NBTIs-IN-7
  • HY-125580
    Makaluvamine A
    		Inhibitor
    Makaluvamine A is a member of Makaluvamines. Makaluvamines can be isolated from Fijian sponges of the genus Zyzzya, and possess inhibitory activity toward topoisomerase II along with cytotoxic activity against HCT-116 human colon cancer cells.
    Makaluvamine A
  • HY-13502AS1
    Mitoxantrone-d8 hydrochloride
    		Inhibitor
    Mitoxantrone-d8 (hydrochloride) (Mitozantrone-d8 (hydrochloride)) is deuterium labeled Mitoxantrone (dihydrochloride). Mitoxantrone dihydrochloride is a potent topoisomerase II inhibitor. Mitoxantrone dihydrochloride also inhibits protein kinase C (PKC) activity with an IC50 of 8.5 μM. Mitoxantrone dihydrochloride induces apoptosis of B-CLL (B-chronic lymphocytic leukaemia) cells. Mitoxantrone dihydrochloride shows antitumor activity. Mitoxantrone dihydrochloride also has anti-orthopoxvirus activity with EC50s of 0.25 μM and and 0.8 μM for cowpox and monkeypox, respectively.
    Mitoxantrone-d<sub>8</sub> hydrochloride
  • HY-13062R
    Daunorubicin hydrochloride (Standard)
    		Inhibitor
    Daunorubicin (hydrochloride) (Standard) is the analytical standard of Daunorubicin (hydrochloride). This product is intended for research and analytical applications. Daunorubicin (Daunomycin) hydrochloride is a topoisomerase II inhibitor with potent anti-tumor activity. Daunorubicin hydrochloride inhibits DNA and RNA synthesis. Daunorubicin hydrochloride is a cytotoxin that inhibits cancer cell viability and induces apoptosis and necrosis. Daunorubicin hydrochloride is also an anthracycline antibiotic. Daunorubicin hydrochloride can be used in the research of infection and variety of cancers, including leukemia, non-Hodgkin lymphomas, Ewing's sarcoma, Wilms' tumor.
    Daunorubicin hydrochloride (Standard)
  • HY-175539
    DNA gyrase/Topo IV-IN-2
    		Inhibitor
    DNA gyrase/Topo IV-IN-2 (Compound AK19) is an antibacterial agent with IC50 values of 0.783 μM and 7.136 μM against E. coli DNA gyrase and topoisomerase IV, respectively. DNA gyrase/Topo IV-IN-2 exhibits broad-spectrum antibacterial efficacy against both Gram-positive and Gram-negative pathogens. DNA gyrase/Topo IV-IN-2 can inhibit the biofilms of B. subtilis and MRSA, with an MIC of 1.9 μM against both B. subtilis and MRSA. DNA gyrase/Topo IV-IN-2 can be used in research related to anti-drug-resistant bacterial drugs.
    DNA gyrase/Topo IV-IN-2
  • HY-117543
    Ethonafide
    		Inhibitor
    Ethonafide (AMP-53) is an anthracene-containing derivative of Amonafide that belongs to the Azonafide series of anticancer agents. Ethonafide (AMP-53) inhibits topoisomerase II activity by stabilizing the enzyme-DNA complex, involving both topoisomerase IIα and β.
    Ethonafide
Cat. No. Product Name / Synonyms Species Source
Cat. No. Product Name / Synonyms Application Reactivity
Topoisomerase Isoform Comparison

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