SRP2033

Sigma-Aldrich

Topo I (197-651) (core domain) human

recombinant, expressed in insect cells, ≥80% (SDS-PAGE)

Sinónimos:
TOPI
En este momento no podemos mostrarle ni los precios ni la disponibilidad

biological source

human

recombinant

expressed in insect cells

assay

≥80% (SDS-PAGE)

form

frozen liquid

mol wt

~56 kDa

packaging

pkg of 5 μg

storage condition

avoid repeated freeze/thaw cycles

concentration

500 μg/mL

color

clear colorless

NCBI accession no.

UniProt accession no.

shipped in

dry ice

storage temp.

−70°C

Gene Information

human ... TOP1(7150)

Biochem/physiol Actions

Human DNA topoisomerase I is the best studied of the DNA topoisomerase family. It catalyzes the relaxation of both positive and negative supercoils without the requirement of energy. In addition to DNA replication and transcriptional activation, DNA topoisomerase I also plays a major role in pre-mRNA splicing, cell cycle and other gene regulatory pathways during cell growth and development. The core domain spanning from amino acids 215 to 636 is highly conserved and retains DNA binding activity. Topo I has been found to nick the DNA with a preference of 5′-(A/T)(G/C)(A/T)T-3′. Camptothecin and its analogs have been tested as potent anticancer compounds by stabilizing topo I-DNA complex, thereby inhibiting both DNA and RNA synthesis.

Physical form

Clear and colorless frozen liquid solution

Preparation Note

Use a manual defrost freezer and avoid repeated freeze-thaw cycles. While working, please keep sample on ice.

RIDADR

NONH for all modes of transport

WGK Germany

WGK 1

Flash Point F

Not applicable

Flash Point C

Not applicable

Certificado de Análisis
L Stewart et al.
The Journal of biological chemistry, 271(13), 7593-7601 (1996-03-29)
Amino acid sequence comparisons of human topoisomerase I (Topo I) with seven other cellular Topo I enzymes reveal that the enzyme can be divided into four major domains: the unconserved NH2-terminal domain (24 kDa), the conserved core domain (54 kDa)...
M R Redinbo et al.
Science (New York, N.Y.), 279(5356), 1504-1513 (1998-03-21)
Topoisomerases I promote the relaxation of DNA superhelical tension by introducing a transient single-stranded break in duplex DNA and are vital for the processes of replication, transcription, and recombination. The crystal structures at 2.1 and 2.5 angstrom resolution of reconstituted...
J J Champoux
Annual review of biochemistry, 70, 369-413 (2001-06-08)
DNA topoisomerases solve the topological problems associated with DNA replication, transcription, recombination, and chromatin remodeling by introducing temporary single- or double-strand breaks in the DNA. In addition, these enzymes fine-tune the steady-state level of DNA supercoiling both to facilitate protein...

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