Monoclonal Anti-Topoisomerase I (mouse IgG1 isotype) is derived from the Mab1 hybridoma produced by the fusion of SP2/0 mouse myeloma cells and splenocytes from BALB/c mice immunized with human purified topoisomerase I. The protein family of DNA topoisomerases is divided into two types (type I and II). The type I enzymes include eukaryotic and bacterial topoisomerase I and III. Human DNA Topoisomerase I belong to the subtype IB enzymes. The protein has four distinct domains. There are four nuclear localization signals in the N-terminal domain. A linker domain of 77 amino acids follows the core domain. The fourth domain, which is 53 amino acids long, contains the active site Tyr723. Topoisomerase I (TOP1) gene is located on human chromosome 20q12.
Immunogen
purified human topoisomerase I
Application
Monoclonal Anti-Topoisomerase I antibody produced in mouse has been used in western blot analysis.
Biochem/physiol Actions
DNA topoisomerases are enzymes that control the amount of supercoiling in DNA. Without topoisomerases, DNA cannot replicate normally. Type I enzymes of DNA topoisomerases introduce transient single strand breaks in DNA. Recently it was reported that DNA topoisomerase I is involved in modulation of RNA and is present in retroviral particles, like human immunodeficiency virus (HIV1). Furthermore, the enzyme enhances HIV-1 cDNA production in reverse transcription assays in vitro. Topoisomerase I (TOP1) serves as swivel at the time of replication, transcription and recombination, which helps in releasing over winding of duplex DNA.
Physical form
Solution in 0.01 M phosphate buffered saline, pH 7.4, containing 15 mM sodium azide.
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Mechanisms for defining supercoiling set point of DNA gyrase orthologs I. A nonconserved acidic C-terminal tail modulates Escherichia coli gyrase activity
Tretter EM and Berger JM
The Journal of Biological Chemistry, 287(22), 18636-18644 (2012)
DNA topoisomerase II and its growing repertoire of biological functions
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Nature Reviews. Cancer, 9(5), 327-327 (2009)
Amygdalin inhibits genes related to cell cycle in SNU-C4 human colon cancer cells
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World Journal of Gastroenterology, 11(33), 5156-5156 (2005)
Tanshinone IIA potentiates the efficacy of 5-FU in Colo205 colon cancer cells in vivo through downregulation of P-gp and LC3-II.
Su C C
Experimental and Therapeutic Medicine, 3(3), 555-559 (2012)
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