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DNA topoisomerase 1

UniProtKB accession:  P11387
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Polymer Entities matching query 16
Go to UniProtKB:  P11387
UniProtKB description:  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-(3'-phosphotyrosyl)-enzyme intermediate and the expulsion of a 5'-OH DNA strand. The free DNA strand then rotates around the intact phosphodiester bond on the opposing strand, thus removing DNA supercoils. Finally, in the religation step, the DNA 5'-OH attacks the covalent intermediate to expel the active-site tyrosine and restore the DNA phosphodiester backbone (By similarity). Regulates the alternative splicing of tissue factor (F3) pre-mRNA in endothelial cells. Involved in the circadian transcription of the core circadian clock component BMAL1 by altering the chromatin structure around the ROR response elements (ROREs) on the BMAL1 promoter.
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Structure Features
Determination Methodology


Sequence Features
Number of Source Taxonomies


Experimental Features
Experimental Method
Resolution


Organisms
Organism
Taxonomy


Protein Domains
SCOP/SCOPe Domain
CATH Domain
ECOD Domain
PFAM Domain
InterPro Domain
[ 4+ ]


Function
Enzyme Classification
GO Molecular Function
[ 2+ ]
GO Biological Process
[ 1+ ]
GO Cellular Component
Disease Association
[ 4+ ]