TOP2/YNL088W Summary Help

TOP2 BASIC INFORMATION

Standard Name TOP2 1
Systematic Name YNL088W
Alias TOR3 , TRF3 2
Feature Type ORF, Verified
Description Essential type II topoisomerase, relieves torsional strain in DNA by cleaving and re-sealing the phosphodiester backbone of both positively and negatively supercoiled DNA; cleaves complementary strands; localizes to axial cores in meiosis (3, 4, 5, 6 and see Summary Paragraph)
Name Description TOPoisomerase 1, 7
GO Annotations All TOP2 GO evidence and references
    View Computational GO annotations for TOP2
Molecular Function
Manually curated
Biological Process
Manually curated
Cellular Component
Manually curated
High-throughput
Mutant Phenotype All TOP2 Phenotype details and references
Classical genetics
reduction of function
Large-scale survey
null
Interactions TOP2 All interactions details and references
71 total interaction(s) for 51 unique genes/features.
Physical Interactions
  • Affinity Capture-MS: 38
  • Affinity Capture-RNA: 1
  • Affinity Capture-Western: 1
  • Biochemical Activity: 1
  • Co-crystal Structure: 2
  • Co-localization: 2
  • Co-purification: 1
  • PCA: 1
  • Reconstituted Complex: 2
  • Two-hybrid: 5
Genetic Interactions
  • Dosage Lethality: 2
  • Dosage Rescue: 3
  • Phenotypic Enhancement: 4
  • Phenotypic Suppression: 1
  • Synthetic Growth Defect: 4
  • Synthetic Lethality: 1
  • Synthetic Rescue: 2
Sequence Information
ChrXIV:457706 to 461992 | ORF Map | GBrowse
Gbrowse
Genetic position: -70 cM
Last Update Coordinates: 2005-11-07 | Sequence: 1996-07-31
Subfeature details
Relative
Coordinates		 Chromosomal
Coordinates		 Most Recent Updates
Coordinates Sequence
CDS 1..4287 457706..461992 2005-11-07 1996-07-31
External Links All Associated Seq | E.C. | Entrez Gene | Entrez RefSeq Protein | MIPS | UniProtKB
Primary SGDIDS000005032

TOP2 RESOURCES

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  • Functional Analysis

Click on histogram for expression summary
Expression Summary histogram

ADDITIONAL INFORMATION for TOP2

SUMMARY PARAGRAPH for TOP2

Topoisomerases catalyze the interconversion between topological states of DNA by breaking and rejoining DNA strands. These changes in DNA topology are required during several cellular processes such as replication, transcription, recombination, and chromosome condensation (8). There are three classes of topoisomerases that are distinguished by substrate (IA, IB, II). Type I topoisomerases cleave one DNA strand, while Type II enzymes cleave a pair of complementary DNA strands (5). The type IB topoisomerases relax both positively and negatively supercoiled DNA; TOP1 encodes the type IB enzyme in yeast (9, 10). Type IA topoisomerase, encoded by TOP3 in yeast, relaxes only negatively supercoiled DNA, and yeast topoisomerase II is encoded by the TOP2 gene (5).

Top2p is a highly conserved, essential protein with homologs in C. elegans, Drosophila, and humans (11); detailed comparisons between yeast and human Top2p have been done (12). Top2p, like other type II enzymes, hydrolyzes ATP and cleaves a pair of complementary strands to relax both positive and negative supercoils in DNA (8). To maintain the integrity of the cleaved DNA, Top2p forms a transient bridge that spans across the double-strand DNA break (5). Several antitumor drugs target Top2p (13). There are inhibitors that block Top2 catalytic activity as well as Top2p poisons that stabilize Top2-DNA complexes.

Last updated: 1999-11-09

REFERENCES CITED ON THIS PAGE [View Complete Literature Guide for TOP2]

1) Holm C, et al.  (1985) DNA topoisomerase II is required at the time of mitosis in yeast. Cell 41(2):553-63
2) Sadoff BU, et al.  (1995) Isolation of mutants of Saccharomyces cerevisiae requiring DNA topoisomerase I. Genetics 141(2):465-79
3) Klein F, et al.  (1992) Localization of RAP1 and topoisomerase II in nuclei and meiotic chromosomes of yeast. J Cell Biol 117(5):935-48
4) Goto T and Wang JC  (1984) Yeast DNA topoisomerase II is encoded by a single-copy, essential gene. Cell 36(4):1073-80
5) Wang JC  (1996) DNA topoisomerases. Annu Rev Biochem 65:635-92
6) Roca J  (1995) The mechanisms of DNA topoisomerases. Trends Biochem Sci 20(4):156-60
7) DiNardo S, et al.  (1984) DNA topoisomerase II mutant of Saccharomyces cerevisiae: topoisomerase II is required for segregation of daughter molecules at the termination of DNA replication. Proc Natl Acad Sci U S A 81(9):2616-20
8) Berger JM  (1998) Structure of DNA topoisomerases. Biochim Biophys Acta 1400(1-3):3-18
9) Thrash C, et al.  (1985) Cloning, characterization, and sequence of the yeast DNA topoisomerase I gene. Proc Natl Acad Sci U S A 82(13):4374-8
10) Goto T and Wang JC  (1985) Cloning of yeast TOP1, the gene encoding DNA topoisomerase I, and construction of mutants defective in both DNA topoisomerase I and DNA topoisomerase II. Proc Natl Acad Sci U S A 82(21):7178-82
11) Hodges PE, et al.  (1999) The Yeast Proteome Database (YPD): a model for the organization and presentation of genome-wide functional data. Nucleic Acids Res 27(1):69-73
12) Strumberg D, et al.  (1999) Molecular analysis of yeast and human type II topoisomerases. Enzyme-DNA and drug interactions. J Biol Chem 274(40):28246-55
13) Beck WT, et al.  (1993) Drug resistance associated with altered DNA topoisomerase II. Adv Enzyme Regul 33:113-27