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 (96):

Cat. No. Product Name Effect Purity
  • HY-15142
    Doxorubicin hydrochloride Inhibitor 99.47%
    Doxorubicin hydrochloride (Hydroxydaunorubicin hydrochloride), a cytotoxic anthracycline antibiotic, is an anti-cancer chemotherapy agent. Doxorubicin hydrochloride inhibits topoisomerase II with an IC50 of 2.67 μM, thus stopping DNA replication. Doxorubicin hydrochloride reduces basal phosphorylation of AMPK and its downstream target acetyl-CoA carboxylase. Doxorubicin hydrochloride induces apoptosis and autophagy. Doxorubicin hydrochloride inhibits human DNA topoisomerase I with an IC50 of 0.8 μM. Doxorubicin hydrochloride also increases exosome release.
  • HY-13629
    Etoposide Inhibitor 99.94%
    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 99.84%
    Irinotecan ((+)-Irinotecan) is a topoisomerase I inhibitor, preventing religation of the DNA strand by binding to topoisomerase I-DNA complex.
  • HY-16560
    Camptothecin Inhibitor 98.62%
    Camptothecin (Campathecin) is a potent DNA enzyme topoisomerase I inhibitor, with an IC50 of 679 nM.
  • 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-122575
    Aurintricarboxylic acid Inhibitor
    Aurintricarboxylic acid is a nanomolar-potency, allosteric antagonist with selectivity towards αβ-methylene-ATP-sensitive P2X1Rs and P2X3Rs, with IC50s of 8.6 nM and 72.9 nM for rP2X1R and rP2X3R, respectively. Aurintricarboxylic acid is a potent anti-influenza agent by directly inhibiting the neuraminidase. Aurintricarboxylic acid is an inhibitor of topoisomerase II and apoptosis. Aurintricarboxylic acid is a selective inhibitor of the TWEAK-Fn14 signaling pathway.Aurintricarboxylic acid also acts as a cystathionine-lyase (CSE) inhibitor with an IC50 of 0.6 μM.
  • HY-135867
    NHC-triphosphate
    NHC-triphosphate is an intracellular metabolite of β-d-N4-Hydroxycytidine (NHC) (HY-125033) as a triphosphate form. NHC-triphosphate is a weak alternative substrate for the viral polymerase and occasionally gets incorporated into HCV replicon RNA.
  • HY-A0170
    Trovafloxacin Inhibitor 98.22%
    Trovafloxacin is a broad-spectrum quinolone antibiotic with potent activity against Gram-positive, Gram-negative and anaerobic organisms. Trovafloxacin blocks the DNA gyrase and topoisomerase IV activity. Trovafloxacin is also a potent, selective and orally active pannexin 1 channel (PANX1) inhibitor with an IC50 of 4 μM for PANX1 inward current. Trovafloxacin does not inhibit connexin 43 gap junction or PANX2. Trovafloxacin leads to dysregulated fragmentation of apoptotic cells by inhibiting PANX1.
  • 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 is a Forkhead box protein p3 (Foxp3) inhibitor and inhibits regulatory T cell activity.
  • HY-13062
    Daunorubicin Hydrochloride Inhibitor 99.37%
    Daunorubicin Hydrochloride (Daunomycin Hydrochloride; RP 13057 Hydrochloride; Rubidomycin Hydrochloride) is a topoisomerase II inhibitor with potent antineoplastic activities. Daunorubicin Hydrochloride (Daunomycin Hydrochloride; RP 13057 Hydrochloride; Rubidomycin Hydrochloride) inhibites DNA and RNA synthesis in sensitive and resistant Ehrlich ascites tumor cells.
  • HY-13768A
    Topotecan Hydrochloride Inhibitor 99.59%
    Topotecan Hydrochloride (SKF 104864A Hydrochloride) is a Topoisomerase I inhibitor with potent antineoplastic activities.
  • HY-B0879A
    Suramin sodium salt Inhibitor 99.93%
    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 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-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-13631A
    Exatecan Mesylate Inhibitor 99.60%
    Exatecan Mesylate is a DNA topoisomerase I inhibitor, with an IC50 of 2.2 μM (0.975 μg/mL), and can be used in cancer research.
  • 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-16261
    Aldoxorubicin Inhibitor
    Aldoxorubicin (INNO-206) is an albumin-binding prodrug of Doxorubicin (DNA topoisomerase II inhibitor), which is released from albumin under acidic conditions. Aldoxorubicin (INNO-206) has potent antitumor activities in various cancer cell lines and in murine tumor models.
  • HY-13631D
    Dxd Inhibitor 98.20%
    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-17577
    Berberine chloride hydrate Inhibitor 99.82%
    Berberine chloride hydrate (Natural Yellow 18 chloride hydrate) is an alkaloid isolated from the Chinese herbal medicine Huanglian, as an antibiotic. Berberine chloride hydrate induces reactive oxygen species (ROS) generation and inhibits DNA topoisomerase. Antineoplastic properties.
  • HY-10529
    Betulinic acid Inhibitor 98.18%
    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.
Isoform Specific Products

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