TOP1 recombinant protein

TOP1 Protein, Human, Recombinant (His Tag)

Cat. Num. AAA8122098

• Gene Names: TOP1; TOPI
• Purity: >95% as determined by SDS-PAGE
• Synonyms: TOP1; TOP1 Protein; Human; Recombinant (His Tag); Human TOP1 Protein (His Tag); TOP1 recombinant protein

• Host: Baculovirus-Insect Cells
• Purity/Purification: >95% as determined by SDS-PAGE
• Form/Format: Lyophilized from sterile 20mM Tris, pH7.5, 200mM NaCl, 20% glycerol. Normally 5%-8% trehalose, mannitol and 0.01% Tween80 are added as protectants before lyophilization. Please refer to the specific buffer information in the hard copy of CoA.
• Sequence: Met1-Phe765

• Species: Human
• Endotoxin: <1.0EU per ug protein as determined by the LAL method.
• Predicted N Terminal: His
• Tag: N-His
• Protein Construction: A DNA sequence encoding the human TOP1 (NP_003277.1)(Met1-Phe765) was expressed with a polyhistidine tag at the N-terminus.
• Reconstitution: A hardcopy of COA with reconstitution instruction is sent along with the products. Please refer to it for detailed information.
• Preparation and Storage: Samples are stable for up to twelve months from date of receipt at -20 degree C to -80 degree C. Store it under sterile conditions at -20 degree C to -80 degree C. It is recommended that the protein be aliquoted for optimal storage. Avoid repeated freeze-thaw cycles.; In general, recombinant proteins are provided as lyophilized powder which are shipped at ambient temperature. Bulk packages of recombinant proteins are provided as frozen liquid.; They are shipped out with blue ice.

SDS-Page

NCBI and Uniprot Product Information

• NCBI GI #: 11225260
• NCBI GeneID: 7150
• NCBI Accession #: NP_003277.1
• NCBI GenBank Nucleotide #: NM_003286.2
• UniProt Accession #: P11387; O43256; Q12855; Q12856; Q15610; Q5TFY3; Q9UJN0; A8KA78; E1P5W3
• Molecular Weight: 90,726 Da
• NCBI Official Full Name: DNA topoisomerase 1
• NCBI Official Synonym Full Names: topoisomerase (DNA) I
• NCBI Official Symbol: TOP1
• NCBI Official Synonym Symbols: TOPI
• NCBI Protein Information: DNA topoisomerase 1; type I DNA topoisomerase
• UniProt Protein Name: DNA topoisomerase 1
• Protein Family: DNA topoisomerase
• UniProt Gene Name: TOP1
• UniProt Entry Name: TOP1_HUMAN

NCBI Description

This gene encodes a DNA topoisomerase, an enzyme that controls and alters the topologic states of DNA during transcription. This enzyme catalyzes the transient breaking and rejoining of a single strand of DNA which allows the strands to pass through one another, thus altering the topology of DNA. This gene is localized to chromosome 20 and has pseudogenes which reside on chromosomes 1 and 22. [provided by RefSeq, Jul 2008]

Uniprot Description

TOP1: Releases the supercoiling and torsional tension of DNA introduced during the DNA replication and transcription by transiently cleaving and rejoining one strand of the DNA duplex. Introduces a single-strand break via transesterification at a target site in duplex DNA. The scissile phosphodiester is attacked by the catalytic tyrosine of the enzyme, resulting in the formation of a DNA-(3'-phosphotyrosyl)-enzyme intermediate and the expulsion of a 5'-OH DNA strand. The free DNA strand than undergoes passage around the unbroken strand thus removing DNA supercoils. Finally, in the religation step, the DNA 5'-OH attacks the covalent intermediate to expel the active-site tyrosine and restore the DNA phosphodiester backbone. Regulates the alternative splicing of tissue factor (F3) pre-mRNA in endothelial cells. A chromosomal aberration involving TOP1 is found in a form of therapy-related myelodysplastic syndrome. Translocation t(11;20)(p15;q11) with NUP98. Belongs to the type IB topoisomerase family.

Protein type: Oncoprotein; Nucleolus; Isomerase; EC 5.99.1.2

Chromosomal Location of Human Ortholog: 20q12-q13.1

Cellular Component: nucleoplasm; nuclear chromosome; nucleolus; perikaryon; nucleus

Molecular Function: DNA topoisomerase (ATP-hydrolyzing) activity; protein binding; DNA binding; chromatin binding; DNA topoisomerase type I activity

Biological Process: circadian rhythm; response to drug; chromatin remodeling; DNA topological change; viral reproduction; programmed cell death; circadian regulation of gene expression; DNA replication; phosphorylation; embryonic cleavage; chromosome segregation