T9069
Topoisomerase I human
buffered aqueous glycerol solution, ≥2 units/μL
Synonym(s):
DNA Topoisomerase I
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About This Item
MDL number:
UNSPSC Code:
12352204
NACRES:
NA.54
Recommended Products
recombinant
expressed in baculovirus
Quality Level
form
buffered aqueous glycerol solution
mol wt
100 kDa
concentration
≥2 units/μL
UniProt accession no.
storage temp.
−70°C
Gene Information
human ... TOP1(7150)
General description
Topoisomerase I (TOP1) is mapped to human chromosome 20q12. TOP1 is a 91 kDa type IB enzyme and consists of N-terminal highly charged domain, a core, linker domain and a C-terminal catalytic domain with Tyr-723 active site residue.
Application
Topoisomerase I has been used in a study to assess implications for the regulation of HIV-1 replication. Topoisomerase I has also been used in a study to investigate the tumor suppressor protein kinase Chk2 is a mediator of anoikis of intestinal epithelial cells.
Topoisomerase I human has been used for Topoisomerase I assay for screening inhibitors.
Biochem/physiol Actions
Topoisomerase I human (TOP1) interacts with DNA by wrapping and takes a bi-lobed conformation. TOPI is essential for normal development and transcriptional regulation. Variants in the TOP1 gene is observed in patients with colorectal cancer.
Topoisomerase I relaxes supercoiled DNA molecules. The enzyme initiates transient breakages and rejoins of phosphodiester bonds in superhelical turns of closed-circular DNA. Enzyme activity is independent of right- and left-handed superhelices.
Unit Definition
One unit will relax 0.25 μg of supercoiled plasmid DNA in 30 minutes at pH 7.9 at 37 °C.
Physical form
Solution containing 20 mM sodium phosphate, pH 7.4, 300 mM NaCl, 50 μg/mL BSA, 50% glycerol, and between 25-100 mM imidazole (concentration will be lot dependent).
signalword
Danger
hcodes
pcodes
Hazard Classifications
Repr. 1B
Storage Class
6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects
wgk_germany
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable
Certificates of Analysis (COA)
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Topoisomerase I in human disease pathogenesis and treatments
Li M and Liu Y
Genomics, Proteomics & Bioinformatics, 14(3), 166-171 (2016)
Binding and dissociation of human topoisomerase I with hairpin-loop RNAs: implications for the regulation of HIV-1 replication
Takahashi H, Sawa H, Hasegawa H,
Biochemical and Biophysical Research Communications, 297(3), 593-599 (2012)
M Lisby et al.
The Journal of biological chemistry, 276(23), 20220-20227 (2001-04-03)
All eukaryotic forms of DNA topoisomerase I contain an extensive and highly charged N-terminal domain. This domain contains several nuclear localization sequences and is essential for in vivo function of the enzyme. However, so far no direct function of the
Novel insights into catalytic mechanism from a crystal structure of human topoisomerase I in complex with DNA
Redinbo MR, et al.
Biochemistry, 39(23), 6832-6840 (2000)
Mechanisms of topoisomerase I (TOP1) gene copy number increase in a stage III colorectal cancer patient cohort
Smith DH, et al.
Testing, 8(4), e60613-e60613 (2013)
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