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-163723
    EGFR-IN-116
    		Inhibitor
    EGFR-IN-116 (compound 14D) is an anticancer agent. EGFR-IN-116 against EGFR has the IC50 values​of EGFR, VEGFR-2 and Topo II are 0.103 μM, 0.069 μM and 19.74 μM, respectively.
    EGFR-IN-116
  • HY-173703
    β-Glu-PAB(CH2NH2)-Exatecan
    		Inhibitor
    β-Glu-PAB(CH2NH2)-Exatecan (Compound 9a) is a topoisomerase I inhibitor. β-Glu-PAB(CH2NH2)-Exatecan binds to the topoisomerase I-DNA complex to prevent DNA strand reconnection, thereby inducing DNA breakage and cell apoptosis. β-Glu-PAB(CH2NH2)-Exatecan can be specifically cleaved by β-glucuronidase highly expressed in the tumor microenvironment to release Exatecan for cytotoxic effect. β-Glu-PAB(CH2NH2)-Exatecan is also an intermediate of Mal((3S,3aR,6S,6aR) -hexahydrofuro [3, 2-B]furan-3,6-diamine-PEG12)-β -Glu-Pab-Exatecan. β-Glu-PAB(CH2NH2)-Exatecan is promising for research of cancers.
    β-Glu-PAB(CH2NH2)-Exatecan
  • HY-145852
    Top/HDAC-IN-2
    		Inhibitor
    Top/HDAC-IN-2 (45b), a Top and HDAC dual inhibitor, exhibits potent antitumor activities and induces apoptosis.
    Top/HDAC-IN-2
  • HY-149271
    Anti-MRSA agent 7
    		Inhibitor
    Anti-MRSA agent 7 (Compound 12) is a potent antibacterial agent. Anti-MRSA agent 7 inhibits S. aureus DNA gyrase, E. coli DNA gyrase, S. aureus topo IV and E. coli topo IV with IC50s of 0.185, 0.365, 0.341 and 0.059 μM, respectively.
    Anti-MRSA agent 7
  • HY-162380
    Topoisomerase II inhibitor 18
    		Inhibitor
    Topoisomerase II inhibitor 18 (Compound IV) is a Quinoxaline derivative, which inhibits topoisomerase II with IC50 of 7.5 μM. Topoisomerase II inhibitor 18 inhibits proliferation, cell cycle at S phase and induces apoptosis in PC-3 cells. Topoisomerase II inhibitor 18 reveals antitumor activity against cancer.
    Topoisomerase II inhibitor 18
  • HY-168739
    Topoisomerase I inhibitor 17
    		Inhibitor
    Topoisomerase I inhibitor 17 (Compound 7h) is a Topoisomerase I (Top1) inhibitor. Topoisomerase I inhibitor 17 reduces DDX5 and reverses the locking of Top1 activity by DDX5. Topoisomerase I inhibitor 17 induces Top1-mediated DNA damage and promotes reactive oxygen species (ROS) production. Topoisomerase I inhibitor 17 induces Apoptosis (reduces antiapoptotic proteins XIAP, Bcl-2, Survivin and up-regulates pro-apoptotic proteins Bax, γH2AX). Topoisomerase I inhibitor 17 also blocks the progression of the G2/M checkpoint and induces cell cycle arrest. Topoisomerase I inhibitor 17 significantly inhibits colony formation and cell migration in colorectal cancer cells. Topoisomerase I inhibitor 17 effectively reduces tumors in human PDX tumor mice.
    Topoisomerase I inhibitor 17
  • HY-N0498R
    Nitidine chloride (Standard)
    		Inhibitor
    Nitidine (chloride) (Standard) is the analytical standard of Nitidine (chloride). This product is intended for research and analytical applications. Nitidine chloride, a potential anti-malarial lead compound derived from Zanthoxylum nitidum (Roxb) DC, exerts potent anticancer activity through diverse pathways, including inducing apoptosis, inhibiting STAT3 signaling cascade, DNA topoisomerase 1 and 2A, ERK and c-Src/FAK associated signaling pathway. Nitidine chloride inhibits LPS-induced inflammatory cytokines production via MAPK and NF-kB pathway.
    Nitidine chloride (Standard)
  • HY-143279
    Topoisomerase II inhibitor 3
    		Inhibitor
    Topoisomerase II inhibitor 3 (Compound 6 h ) is a acridone derivatives, as well as a Type II DNA topoisomerase (topo II) inhibitor , as a topo IIα/β inhibitor with the value of IC50 is 0.17 μM for topo IIα and the value of IC50 is 0.23 μM for topo IIβ subtypes, caused obvious DNA damage, and induced apoptosis by triggering the loss of mitochondrial membrane potential.
    Topoisomerase II inhibitor 3
  • HY-116933
    Murrayanol
    		Inhibitor
    Murrayanol is a natural carbazole alkaloid with a variety of biological activities. Murrayanol shows anti-inflammatory, topoisomerase I and topoisomerase II (Topoisomerase) inhibition activities. Murrayanol also as a mosquitocidal and antimicrobial.
    Murrayanol
  • HY-13726
    Piroxantrone
    		Inhibitor
    Piroxantrone (Oxantrazole) is a potent DNA topoisomerase II-targeting anthrapyrazole antitumor agent. Piroxantrone displays cardiotoxicity.
    Piroxantrone
  • HY-146316
    Topoisomerase II inhibitor 6
    		Inhibitor
    Topoisomerase II inhibitor 6 (Compound 5), a tryptanthrin derivative, is a potent and selective inhibitor of topoisomerase II. Topoisomerase II inhibitor 6 exhibits antiproliferative activity on different tumor cell lines. Topoisomerase II inhibitor 6 blocks the cell cycle of CCRF-CEM in the G2 phase and induces DNA DSB. Topoisomerase II inhibitor 6 has the potential for the research of cancer diseases.
    Topoisomerase II inhibitor 6
  • HY-10982A
    Amonafide dihydrochloride
    		Inhibitor
    Amonafide dihydrochloride (AS1413 dihydrochloride) is a topoisomerase II (Topo II) inhibitor and DNA intercalator with activity in inducing apoptotic signaling. Amonafide dihydrochloride can inhibit the binding of Topo II to DNA, thereby preventing the synthesis of DNA and RNA. Amonafide dihydrochloride maintains cytotoxic activity in the presence of P-glycoprotein-mediated multidrug resistance (MDR).
    Amonafide dihydrochloride
  • HY-149239
    Topo II/HDAC-IN-2
    		Inhibitor
    Topo II/HDAC-IN-2 (8d) exhibits excellent dual inhibitory activities against Topo II and HDAC. Topo II/HDAC-IN-2 (8d) induces apoptosis.
    Topo II/HDAC-IN-2
  • HY-17460B
    Garenoxacin mesylate
    		Inhibitor
    Garenoxacin (BMS 284756) mesylate is an orally active quinolone antibiotic and Garenoxacin mesylate has a broad spectrum of activity against a wide array of gram-positive and gram-negative bacteria, anaerobes. Garenoxacin mesylate also inhibits Gyrase and TOPO IV.
    Garenoxacin mesylate
  • HY-162341
    Topoisomerase I inhibitor 15
    		Inhibitor
    Topoisomerase I inhibitor 15 (compound 4b) is an inhibitor of topoisomerase I with anticancer activity. Topoisomerase I inhibitor 15 inhibits A549 cells with an IC50 of 7.34 μM.
    Topoisomerase I inhibitor 15
  • HY-175034
    Topoisomerase I/II-IN-1
    		Inhibitor
    Topoisomerase I/II-IN-1 is a dual inhibitor of topoisomerase I/II. Topoisomerase I/II-IN-1 induces G2/M arrest and apoptosis in cancer cells by upregulating p53, p21, and Bax mRNA levels, caspase-3 protein levels, and the Bax/Bcl-2 ratio, while downregulating Bcl-2. Topoisomerase I/II-IN-1 is useful in the study of various cancers, including melanoma, renal cancer, colorectal cancer, and breast cancer.
    Topoisomerase I/II-IN-1
  • HY-144654
    HDAC/Top-IN-1
    		Inhibitor
    HDAC/Top-IN-1 is an orally active and pan HDAC/Top dual inhibitor with IC50s of 0.036 μM, 0.14 μM, 0.059 μM, 0.089 μM and 9.8 μM for HDAC1, HDAC2, HDAC3, HDAC6 and HDAC8. HDAC/Top-IN-1 efficiently induces apoptosis with S cell-cycle arrest in HEL cells. HDAC/Top-IN-1 has exhibits excellent in vivo antitumor efficacy.
    HDAC/Top-IN-1
  • HY-126054
    A1062
    		Inhibitor
    A1062 is an inhibitor for Tn3 encoded resolvase with IC50 in micromolar level. A1062 suppresses the binding of resolvase proteins to res sites, and blocks resolvase-induced site-specific recombination.
    A1062
  • HY-132164A
    Gly-7-MAD-MDCPT hydrochloride
    		Inhibitor 98.27%
    Gly-7-MAD-MDCPT (Compound 4b) hydrochloride is an anticancer agent. Gly-7-MAD-MDCPT hydrochloride is a Camptothecin (HY-16560) compound, which shows cytotoxicity to various cancer cells with IC50 values of 10-1000 nM.
    Gly-7-MAD-MDCPT hydrochloride
  • HY-174837
    Topoisomerase IIα-IN-11
    		Inhibitor
    Topoisomerase IIα-IN-11 (Compound 16h) is a potent Topoisomerase IIα inhibitor. Topoisomerase IIα-IN-11 shows significant inhibition on melanoma A2058 cell lines (IC50 3-6 μM). Topoisomerase IIα-IN-11 is promising for research of cancers (especially melanoma).
    Topoisomerase IIα-IN-11
Cat. No. Product Name / Synonyms Species Source
Cat. No. Product Name / Synonyms Application Reactivity
Topoisomerase Isoform Comparison

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