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Available structures
PDB Ortholog search: PDBe RCSB
Aliases TOP2B, TOPIIB, top2beta, topoisomerase (DNA) II beta, DNA topoisomerase II beta
External IDs MGI: 98791 HomoloGene: 134711 GeneCards: TOP2B
Gene location (Human)
Chromosome 3 (human)
Chr. Chromosome 3 (human)[1]
Chromosome 3 (human)
Genomic location for TOP2B
Genomic location for TOP2B
Band 3p24.2 Start 25,597,905 bp[1]
End 25,664,907 bp[1]
RNA expression pattern
PBB GE TOP2B 211987 at fs.png
More reference expression data
Species Human Mouse
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC) Chr 3: 25.6 – 25.66 Mb Chr 14: 16.37 – 16.44 Mb
PubMed search [3] [4]
View/Edit Human View/Edit Mouse

DNA topoisomerase 2-beta is an enzyme that in humans is encoded by the TOP2B gene.[5][6]


This gene encodes a DNA topoisomerase, an enzyme that controls and alters the topologic states of DNA during transcription. This nuclear enzyme is involved in processes such as chromosome condensation, chromatid separation, and the relief of torsional stress that occurs during DNA transcription and replication. It catalyzes the transient breaking and rejoining of two strands of duplex DNA which allows the strands to pass through one another, thus altering the topology of DNA. Two forms of this enzyme exist as likely products of a gene duplication event. The gene encoding this form, beta, is localized to chromosome 3 and the alpha form is localized to chromosome 17. The gene encoding this enzyme functions as the target for several anticancer agents, for example mitoxantrone, and a variety of mutations in this gene have been associated with the development of drug resistance. Reduced activity of this enzyme may also play a role in ataxia-telangiectasia. Alternative splicing of this gene results in two transcript variants; however, the second variant has not yet been fully described.[7]


TOP2B has been shown to interact with:


  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000077097 - Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000017485 - Ensembl, May 2017
  3. ^ "Human PubMed Reference:". 
  4. ^ "Mouse PubMed Reference:". 
  5. ^ Tan KB, Dorman TE, Falls KM, Chung TD, Mirabelli CK, Crooke ST, Mao J (Jan 1992). "Topoisomerase II alpha and topoisomerase II beta genes: characterization and mapping to human chromosomes 17 and 3, respectively". Cancer Research. 52 (1): 231–4. PMID 1309226. 
  6. ^ Jenkins JR, Ayton P, Jones T, Davies SL, Simmons DL, Harris AL, Sheer D, Hickson ID (Nov 1992). "Isolation of cDNA clones encoding the beta isozyme of human DNA topoisomerase II and localisation of the gene to chromosome 3p24". Nucleic Acids Research. 20 (21): 5587–92. doi:10.1093/nar/20.21.5587. PMC 334390Freely accessible. PMID 1333583. 
  7. ^ "Entrez Gene: TOP2B topoisomerase (DNA) II beta 180kDa". 
  8. ^ Kitagawa H, Fujiki R, Yoshimura K, Mezaki Y, Uematsu Y, Matsui D, Ogawa S, Unno K, Okubo M, Tokita A, Nakagawa T, Ito T, Ishimi Y, Nagasawa H, Matsumoto T, Yanagisawa J, Kato S (Jun 2003). "The chromatin-remodeling complex WINAC targets a nuclear receptor to promoters and is impaired in Williams syndrome". Cell. 113 (7): 905–17. doi:10.1016/s0092-8674(03)00436-7. PMID 12837248. 
  9. ^ a b Tsai SC, Valkov N, Yang WM, Gump J, Sullivan D, Seto E (Nov 2000). "Histone deacetylase interacts directly with DNA topoisomerase II". Nature Genetics. 26 (3): 349–53. doi:10.1038/81671. PMID 11062478. 
  10. ^ Johnson CA, Padget K, Austin CA, Turner BM (Feb 2001). "Deacetylase activity associates with topoisomerase II and is necessary for etoposide-induced apoptosis". The Journal of Biological Chemistry. 276 (7): 4539–42. doi:10.1074/jbc.C000824200. PMID 11136718. 
  11. ^ Cowell IG, Okorokov AL, Cutts SA, Padget K, Bell M, Milner J, Austin CA (Feb 2000). "Human topoisomerase IIalpha and IIbeta interact with the C-terminal region of p53". Experimental Cell Research. 255 (1): 86–94. doi:10.1006/excr.1999.4772. PMID 10666337. 
  12. ^ Mao Y, Desai SD, Liu LF (Aug 2000). "SUMO-1 conjugation to human DNA topoisomerase II isozymes". The Journal of Biological Chemistry. 275 (34): 26066–73. doi:10.1074/jbc.M001831200. PMID 10862613. 
  13. ^ Nakano H, Yamazaki T, Miyatake S, Nozaki N, Kikuchi A, Saito T (Mar 1996). "Specific interaction of topoisomerase II beta and the CD3 epsilon chain of the T cell receptor complex". The Journal of Biological Chemistry. 271 (11): 6483–9. doi:10.1074/jbc.271.11.6483. PMID 8626450. 

Further reading[edit]