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Topoisomerase (DNA) I
Protein TOP1 PDB 1a31.png
PDB rendering based on 1a31.
Available structures
PDB Ortholog search: PDBe, RCSB
Symbols TOP1 ; TOPI
External IDs OMIM126420 MGI98788 HomoloGene2467 ChEMBL: 1781 GeneCards: TOP1 Gene
EC number
Species Human Mouse
Entrez 7150 21969
Ensembl ENSG00000198900 ENSMUSG00000070544
UniProt P11387 Q04750
RefSeq (mRNA) NM_003286 NM_009408
RefSeq (protein) NP_003277 NP_033434
Location (UCSC) Chr 20:
41.03 – 41.12 Mb
Chr 2:
160.65 – 160.72 Mb
PubMed search [1] [2]

DNA topoisomerase 1 is an enzyme that in humans is encoded by the TOP1 gene.


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.[1]


TOP1 has been shown to interact with:

See also[edit]


  1. ^ "Entrez Gene: TOP1 topoisomerase (DNA) I". 
  2. ^ Labourier E, Rossi F, Gallouzi IE, Allemand E, Divita G, Tazi J (Jun 1998). "Interaction between the N-terminal domain of human DNA topoisomerase I and the arginine-serine domain of its substrate determines phosphorylation of SF2/ASF splicing factor". Nucleic Acids Research 26 (12): 2955–62. doi:10.1093/nar/26.12.2955. PMC 147637. PMID 9611241. 
  3. ^ Andersen FF, Tange TØ, Sinnathamby T, Olesen JR, Andersen KE, Westergaard O, Kjems J, Knudsen BR (Sep 2002). "The RNA splicing factor ASF/SF2 inhibits human topoisomerase I mediated DNA relaxation". Journal of Molecular Biology 322 (4): 677–86. doi:10.1016/s0022-2836(02)00815-x. PMID 12270705. 
  4. ^ a b Xu L, Yang L, Hashimoto K, Anderson M, Kohlhagen G, Pommier Y, D'Arpa P (2002). "Characterization of BTBD1 and BTBD2, two similar BTB-domain-containing Kelch-like proteins that interact with Topoisomerase I". BMC Genomics 3: 1. doi:10.1186/1471-2164-3-1. PMC 64781. PMID 11818025. 
  5. ^ Haluska P, Saleem A, Edwards TK, Rubin EH (Apr 1998). "Interaction between the N-terminus of human topoisomerase I and SV40 large T antigen". Nucleic Acids Research 26 (7): 1841–7. doi:10.1093/nar/26.7.1841. PMC 147454. PMID 9512561. 
  6. ^ Bharti AK, Olson MO, Kufe DW, Rubin EH (Jan 1996). "Identification of a nucleolin binding site in human topoisomerase I". The Journal of Biological Chemistry 271 (4): 1993–7. doi:10.1074/jbc.271.4.1993. PMID 8567649. 
  7. ^ Gobert C, Skladanowski A, Larsen AK (Aug 1999). "The interaction between p53 and DNA topoisomerase I is regulated differently in cells with wild-type and mutant p53". Proceedings of the National Academy of Sciences of the United States of America 96 (18): 10355–60. doi:10.1073/pnas.96.18.10355. PMC 17892. PMID 10468612. 
  8. ^ Mao Y, Mehl IR, Muller MT (Feb 2002). "Subnuclear distribution of topoisomerase I is linked to ongoing transcription and p53 status". Proceedings of the National Academy of Sciences of the United States of America 99 (3): 1235–40. doi:10.1073/pnas.022631899. PMC 122173. PMID 11805286. 
  9. ^ Mao Y, Sun M, Desai SD, Liu LF (Apr 2000). "SUMO-1 conjugation to topoisomerase I: A possible repair response to topoisomerase-mediated DNA damage". Proceedings of the National Academy of Sciences of the United States of America 97 (8): 4046–51. doi:10.1073/pnas.080536597. PMC 18143. PMID 10759568. 

Further reading[edit]