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

Topoisomerase

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

  • Topo I

  • Topo II

Topoisomerase Related Products (109):

Cat. No. Product Name Effect Purity
  • HY-15142
    Doxorubicin hydrochloride Inhibitor ≥99.0%
    Doxorubicin (Hydroxydaunorubicin) hydrochloride, a cytotoxic anthracycline antibiotic, is an anti-cancer chemotherapy agent. Doxorubicin hydrochloride is a potent human DNA topoisomerase I and topoisomerase II inhibitor with IC50s of 0.8 μM and 2.67 μM, respectively. Doxorubicin hydrochloride reduces basal phosphorylation of AMPK and its downstream target acetyl-CoA carboxylase. Doxorubicin hydrochloride induces apoptosis and autophagy.
  • HY-13629
    Etoposide Inhibitor ≥98.0%
    Etoposide (VP-16; VP-16-213) is an anti-cancer chemotherapy agent. Etoposide inhibits topoisomerase II, thus stopping DNA replication. Etoposide induces cell cycle arrest, apoptosis and autophagy.
  • HY-16562
    Irinotecan Inhibitor
    Irinotecan ((+)-Irinotecan) is a topoisomerase I inhibitor, preventing religation of the DNA strand by binding to topoisomerase I-DNA complex.
  • HY-13704
    SN-38 Inhibitor 99.46%
    SN-38 (NK012) is an active metabolite of the Topoisomerase I inhibitor Irinotecan. SN-38 (NK012) inhibits DNA and RNA synthesis with IC50s of 0.077 and 1.3 μM, respectively.
  • HY-16560
    Camptothecin Inhibitor ≥98.0%
    Camptothecin (Campathecin) is a potent DNA enzyme topoisomerase I inhibitor, with an IC50 of 679 nM.
  • HY-13631AS
    Exatecan D5 mesylate Inhibitor 99.41%
    Exatecan D5 mesylate (DX8951f-D5) is deuterium labeled Exatecan Mesylate. Exatecan mesylate is a DNA topoisomerase I inhibitor, with an IC50 of 0.975 μg/mL.
  • HY-135867A
    NHC-triphosphate tetrasodium Inhibitor 98.06%
    NHC-triphosphate tetrasodium is an active phosphorylated intracellular metabolite of β-d-N4-Hydroxycytidine (NHC) (HY-125033) as a triphosphate form. NHC-triphosphate tetrasodium is a weak alternative substrate for the viral polymerase and can be incorporated into HCV replicon RNA.
  • HY-111630
    PluriSIn #2 Inhibitor ≥98.0%
    PluriSIn #2 is a selective transcriptional inhibitor of topoisomerase II α (TOP2A). PluriSIn #2 is a compound that selectively eliminates undifferentiated human pluripotent stem cells (hPSCs).
  • HY-13624A
    Epirubicin hydrochloride Inhibitor 99.16%
    Epirubicin hydrochloride (4'-Epidoxorubicin hydrochloride), a semisynthetic L-arabino derivative of doxorubicin, has an antineoplastic agent by inhibiting Topoisomerase. Epirubicin hydrochloride inhibits DNA and RNA synthesis. Epirubicin hydrochloride is a Forkhead box protein p3 (Foxp3) inhibitor and inhibits regulatory T cell activity.
  • HY-13768A
    Topotecan Hydrochloride Inhibitor 99.74%
    Topotecan Hydrochloride (SKF 104864A Hydrochloride) is a Topoisomerase I inhibitor with potent antineoplastic activities.
  • HY-13062
    Daunorubicin hydrochloride Inhibitor 99.37%
    Daunorubicin (Daunomycin) hydrochloride is a topoisomerase II inhibitor with potent antineoplastic activities. Daunorubicin hydrochloride inhibits DNA and RNA synthesis in sensitive and resistant Ehrlich ascites tumor cells.
  • HY-13631A
    Exatecan mesylate Inhibitor ≥98.0%
    Exatecan mesylate (DX8951f) is a DNA topoisomerase I inhibitor, with an IC50 of 2.2 μM (0.975 μg/mL). Exatecan mesylate can be used in cancer research.
  • HY-B0879A
    Suramin sodium salt Inhibitor ≥98.0%
    Suramin sodium salt (Suramin hexasodium salt) is a reversible and competitive protein-tyrosine phosphatases (PTPases) inhibitor. Suramin sodium salt is a potent inhibitor of sirtuins: SirT1 (IC50=297 nM), SirT2 (IC50=1.15 μM), and SirT5 (IC50=22 μM). Suramin sodium salt is a competitive inhibitor of reverse transcriptase (DNA topoisomerase II: IC50=5 μM). Suramin sodium salt is a potent SARS-CoV-2 RNA-dependent RNA polymerase (RdRp) inhibitor. Suramin sodium salt efficiently inhibits IP5K and is an antiparasitic, anti-neoplastic and anti-angiogenic agent.
  • HY-13502
    Mitoxantrone Inhibitor ≥98.0%
    Mitoxantrone is a topoisomerase II inhibitor; also inhibits protein kinase C (PKC) activity with an IC50 of 8.5 μM.
  • HY-13631D
    Dxd Inhibitor
    Dxd (Exatecan derivative for ADC) is a potent DNA topoisomerase I inhibitor, with an IC50 of 0.31 μM, used as a conjugated drug of HER2-targeting ADC (DS-8201a).
  • HY-16562A
    Irinotecan hydrochloride Inhibitor 99.75%
    Irinotecan hydrochloride ((+)-Irinotecan hydrochloride) is a topoisomerase I inhibitor mainly used to treat colon cancer and rectal cancer.
  • HY-18258
    Berberine chloride Inhibitor ≥98.0%
    Berberine chloride is an alkaloid isolated from the Chinese herbal medicine Huanglian, as an antibiotic. Berberine chloride induces reactive oxygen species (ROS) generation and inhibits DNA topoisomerase. Antineoplastic properties.
  • HY-10529
    Betulinic acid Inhibitor ≥98.0%
    Betulinic acid is a natural pentacyclic triterpenoid, acts as a eukaryotic topoisomerase I inhibitor, with an IC50 of 5 μM, and possesses anti-HIV, anti-malarial, anti-inflammatory and anti-tumor properties. Betulinic acid acts as a new activator of NF-kB.
  • HY-17381
    Idarubicin hydrochloride Inhibitor 99.82%
    Idarubicin hydrochloride is an anthracycline antileukemic drug. It inhibits the topoisomerase II interfering with the replication of DNA and RNA transcription. Idarubicin hydrochloride inhibits the growth of bacteria and yeasts.
  • HY-125033
    EIDD-1931 Inhibitor 99.73%
    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 encephalitis virus (VEEV), Chikungunya virus (CHIKV) and hepatitis C virus (HCV).
Isoform Specific Products

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