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-123363
    Tafluposide
    		Inhibitor
    Tafluposide (F-11782) is a DNA topoisomerase inhibitor. Tafluposide has antitumor activity.
    Tafluposide
  • HY-B0356S2
    Ciprofloxacin-d4
    		Inhibitor
    Ciprofloxacin-d4 (Bay-09867-d4) is deuterium labeled Ciprofloxacin. Ciprofloxacin (Bay-09867) is a potent, orally active topoisomerase IV inhibitor. Ciprofloxacin induces mitochondrial DNA and nuclear DNA damage and lead to mitochondrial dysfunction, ROS production. Ciprofloxacin has anti-proliferative activity and induces apoptosis. Ciprofloxacin is a fluoroquinolone antibiotic, exhibiting potent antibacterial activity.
    Ciprofloxacin-d<sub>4</sub>
  • HY-10581CR
    Gatifloxacin sesquihydrate (Standard)
    		Inhibitor
    Gatifloxacin (sesquihydrate) (Standard) is the analytical standard of Gatifloxacin (sesquihydrate). This product is intended for research and analytical applications. Gatifloxacin sesquihydrate (AM-1155; BMS-206584; PD135432) is a potent fluoroquinolone antibiotic with broad-spectrum antibacterial activity. Gatifloxacin sesquihydrate 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 sesquihydrate can be used to treat bacterial conjunctivitis?in vivo.
    Gatifloxacin sesquihydrate (Standard)
  • HY-B0356BR
    Ciprofloxacin hydrochloride monohydrate (Standard)
    		Inhibitor
    Ciprofloxacin (hydrochloride monohydrate) (Standard) is the analytical standard of Ciprofloxacin (hydrochloride monohydrate). This product is intended for research and analytical applications. Ciprofloxacin (Bay-09867) hydrochloride monohydrate is a potent, orally active topoisomerase IV inhibitor. Ciprofloxacin hydrochloride monohydrate induces mitochondrial DNA and nuclear DNA damage and lead to mitochondrial dysfunction, ROS production. Ciprofloxacin hydrochloride monohydrate has anti-proliferative activity and induces apoptosis. Ciprofloxacin hydrochloride monohydrate is a fluoroquinolone antibiotic, exhibiting potent antibacterial activity.
    Ciprofloxacin hydrochloride monohydrate (Standard)
  • HY-134290
    8-Chloro-ATP
    		Inhibitor
    8-Chloro-ATP, an ATP (HY-B2176) analog, is a topoisomerase II (Topo II) inhibitor. 8-Chloro-ATP inhibits DNA synthesis and induces DNA double-stranded breaks (DSBs). 8-Chloro-ATP inhibits Topo II-catalyzed ATP hydrolysis.
    8-Chloro-ATP
  • HY-49556
    (S)-Benzyl 2-cyclopropyl-2-hydroxyacetate
    		Control 98.69%
    (S)-Benzyl 2-cyclopropyl-2-hydroxyacetate is an intermediate reactant in the synthesis of Camptothecin (HY-16560). Camptothecin is an inhibitor of the DNA topoisomerase Topo I, withIC50=679 nM.
    (S)-Benzyl 2-cyclopropyl-2-hydroxyacetate
  • HY-N0275R
    (±)-10-Hydroxycamptothecin (Standard)
    		Inhibitor
    (±)-10-Hydroxycamptothecin (Standard) is the analytical standard of (±)-10-Hydroxycamptothecin. This product is intended for research and analytical applications. (±)-10-Hydroxycamptothecin is an indole alkaloid that inhibits the activity of topoisomerase I and has a broad spectrum of anticancer activity.
    (±)-10-Hydroxycamptothecin (Standard)
  • HY-18258R
    Berberine chloride (Standard)
    		Inhibitor
    Berberine (chloride) (Standard) is the analytical standard of Berberine (chloride). This product is intended for research and analytical applications. Berberine chloride is an alkaloid that acts as an antibiotic. Berberine chloride induces reactive oxygen species (ROS) generation and inhibits DNA topoisomerase. Antineoplastic properties.
    Berberine chloride (Standard)
  • HY-100620R
    RPR121056 (Standard)
    		Inhibitor
    RPR121056 (Standard) is the analytical standard of RPR121056. This product is intended for research and analytical applications. RPR121056 (APC) is a metabolite of Irinotecan (CPT-11), which is generated by CYP3A4. Irinotecan (CPT-11) is an antineoplastic agent that inhibits topoisomerase type I, causing cell death, and is widely used in the treatment of colorectal cancer. Irinotecan also directly inhibits AChE[1].
    RPR121056 (Standard)
  • HY-13725AR
    Pirarubicin Hydrochloride (Standard)
    		Inhibitor
    Pirarubicin (Hydrochloride) (Standard) is the analytical standard of Pirarubicin (Hydrochloride). This product is intended for research and analytical applications. Pirarubicin Hydrochloride is an anthracycline antibiotics, acts as a topoisomerase II inhibitor, and is a widely used for treatment of various cancers, in particular, solid tumors.
    Pirarubicin Hydrochloride (Standard)
  • HY-13562S
    Banoxantrone-d12
    Banoxantrone-d12 is the deuterium labeled banoxantrone. Banoxantrone is a novel bioreductive agent that can be reduced to a stable, DNA-affinic compound AQ4, which is a potent topoisomerase II inhibitor.
    Banoxantrone-d<sub>12</sub>
  • HY-13562AS
    Banoxantrone-d12 dihydrochloride
    Banoxantrone-d12 (dihydrochloride) is the deuterium labeled Banoxantrone dihydrochloride. Banoxantrone is a novel bioreductive agent that can be reduced to a stable, DNA-affinic compound AQ4, which is a potent topoisomerase II inhibitor.
    Banoxantrone-d<sub>12</sub> dihydrochloride
Cat. No. Product Name / Synonyms Species Source
Cat. No. Product Name / Synonyms Application Reactivity
Topoisomerase Isoform Comparison

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