Rabbit anti-Human TOP3B Polyclonal Antibody

Uniprot Id

O95985

Target Species

Human

Target Name

TOP3B

Target Full Name

DNA topoisomerase 3-beta-1

Target Function

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-(5'-phosphotyrosyl)-enzyme intermediate and the expulsion of a 3'-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 3'-OH attacks the covalent intermediate to expel the active-site tyrosine and restore the DNA phosphodiester backbone. Possesses negatively supercoiled DNA relaxing activity.

Target Protein Families

Type IA topoisomerase family

Target Tissue Specificity

Isoform 1 is found in testis, heart and skeletal muscle. A 4 kb transcript which probably represents isoform 2 is found in thymus, kidney and pancreas.

Target Synonyms

DNA topoisomerase 3 beta 1; DNA topoisomerase 3-beta-1; DNA topoisomerase III beta 1; DNA topoisomerase III beta-1; FLJ39376; TOP 3B; TOP3B; TOP3B_HUMAN; TOP3B1; Topo III beta; Topoisomerase (DNA) III beta; Topoisomerase DNA III beta; Topoisomerase III beta

Target Background

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 relaxing the supercoils and altering the topology of DNA. The enzyme interacts with DNA helicase SGS1 and plays a role in DNA recombination, cellular aging and maintenance of genome stability. Low expression of this gene may be related to higher survival rates in breast cancer patients. This gene has a pseudogene on chromosome 22. Alternate splicing results in multiple transcript variants. Additional alternatively spliced transcript variants of this gene have been described, but their full-length nature is not known.