About this Antibody |
Name | Topoisomerase I Rabbit Monoclonal Antibody |
Category | Rabbit Monoclonal Antibody (RabMAb); Primary antibody |
Isotype | IgG |
Purification | Affinity purification |
About the Immunogen |
Immunogen | Recombinant protein |
Gene ID | 7150(Human); 21969(Mouse) |
SwissProt | P11387(Human); Q04750(Mouse) |
Synonyms | TOPI |
Category | DNA Damage |
Background | DNA topoisomerases play essential roles in many DNA metabolic processes including DNA repair. Topoisomerases can introduce DNA damage upon exposure to drugs that stabilize the covalent protein-DNA intermediate of the topoisomerase reaction. Lesions in DNA are also able to trap topoisomerase-DNA intermediates. DNA topoisomerase I (Top1) catalyzes the relaxation of supercoiled DNA by a mechanism of transient DNA strand cleavage characterized by the formation of a phosphotyrosyl bond between the DNA end and active site tyrosine. The antitumor agent camptothecin (CPT) reversibly stabilizes the covalent enzyme-DNA intermediate by inhibiting DNA religation. When a replication fork collides with a DNA Top1 cleavage complex, the covalently bound enzyme must be removed from the DNA 3' end before recombination-dependent replication restart. The tyrosyl-DNA phosphodiesterase Tdp1 and the structure-specific endonuclease Rad1-Rad10 function as primary alternative pathways of Top1 repair in Saccharomyces cerevisiae. In the budding yeast S. cerevisiae, DNA topoisomerases I and II can functionally substitute for each other in removing positive and negative DNA supercoils. |