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In molecular biology Type I topoisomerases are enzymes that cut one of the two strands of double-stranded DNA, relax the strand, and reanneal the strand. They are further subdivided into two structurally and mechanistically distinct topoisomerases: type IA and type IB. * Type IA topoisomerases change the linking number of a circular DNA strand by units of strictly 1. * Type IB topoisomerases change the linking number by multiples of 1 (n).

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  • En biología molecular, las topoisomerasas tipo I son enzimas que cortan una de las dos cadenas de ADN bicatenario, relajan la cadena y vuelven a unir la cadena. Se subdividen en dos topoisomerasas estructural y mecánicamente distintas: tipo IA y tipo IB. * Las topoisomerasas de tipo IA cambian el número de enlace de una cadena de ADN circular por unidades de estrictamente 1. * Las topoisomerasas de tipo IB cambian el número de enlace por múltiplos de 1(n). Históricamente, las topoisomerasas de tipo IA se denominan topo I procarióticas, mientras que las topoisomerasas de tipo IB se denominan topoisomerasas eucariotas. Sin embargo, esta distinción ya no se aplica ya que las topoisomerasas tipo IA y tipo IB existen en todos los dominios de la vida. Funcionalmente, estas subclases realizan funciones muy especializadas. La topoisomerasa procariota I (topo IA) solo puede relajar el ADN superenrollado negativo, mientras que la topoisomerasa eucariota I (topo IB) puede introducir superenrollamientos positivos, separando el ADN de los cromosomas hijos después de la replicación del ADN, y relajando el ADN. (es)
  • In molecular biology Type I topoisomerases are enzymes that cut one of the two strands of double-stranded DNA, relax the strand, and reanneal the strand. They are further subdivided into two structurally and mechanistically distinct topoisomerases: type IA and type IB. * Type IA topoisomerases change the linking number of a circular DNA strand by units of strictly 1. * Type IB topoisomerases change the linking number by multiples of 1 (n). Historically, type IA topoisomerases are referred to as prokaryotic topo I, while type IB topoisomerases are referred to as eukaryotic topoisomerase. This distinction, however, no longer applies as type IA and type IB topoisomerases exist in all domains of life. Functionally, these subclasses perform very specialized functions. Prokaryotic topoisomerase I (topo IA) can only relax negative supercoiled DNA, whereas eukaryotic topoisomerase I (topo IB) can introduce positive supercoils, separating the DNA of daughter chromosomes after DNA replication, and relax DNA. (en)
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  • VirDNA-topo-I_N
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  • 1045901823 (xsd:integer)
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  • amino terminal 9kda domain of vaccinia virus dna topoisomerase i residues 1-77, experimental electron density for residues 1-77 (en)
dbp:interpro
  • IPR015346 (en)
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  • DNA topoisomerase I, N-terminal , viral (en)
dbp:pfam
  • PF09266 (en)
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  • 1 (xsd:integer)
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  • VirDNA-topo-I_N (en)
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  • En biología molecular, las topoisomerasas tipo I son enzimas que cortan una de las dos cadenas de ADN bicatenario, relajan la cadena y vuelven a unir la cadena. Se subdividen en dos topoisomerasas estructural y mecánicamente distintas: tipo IA y tipo IB. * Las topoisomerasas de tipo IA cambian el número de enlace de una cadena de ADN circular por unidades de estrictamente 1. * Las topoisomerasas de tipo IB cambian el número de enlace por múltiplos de 1(n). (es)
  • In molecular biology Type I topoisomerases are enzymes that cut one of the two strands of double-stranded DNA, relax the strand, and reanneal the strand. They are further subdivided into two structurally and mechanistically distinct topoisomerases: type IA and type IB. * Type IA topoisomerases change the linking number of a circular DNA strand by units of strictly 1. * Type IB topoisomerases change the linking number by multiples of 1 (n). (en)
rdfs:label
  • Topoisomerasas tipo I (es)
  • Type I topoisomerase (en)
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