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Cooperative Binding of Transcription Regulators02:13

Cooperative Binding of Transcription Regulators

Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...
Cooperative Binding of Transcription Regulators02:13

Cooperative Binding of Transcription Regulators

Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...
Operon Model01:23

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The operon model represents a fundamental mechanism of gene regulation in prokaryotes, enabling coordinated expression of genes involved in related metabolic or functional pathways. Operons consist of structural genes, a promoter, and an operator, with transcription regulated by repressors, activators, and small effector molecules.Structure and Function of OperonsAn operon is a cluster of structural genes transcribed together under the control of a single promoter. The promoter region...
Cooperative Allosteric Transitions01:58

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...

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La estructura cristalina del represor lambda y un modelo para la unión de operadores cooperativos en pares.

Steven Stayrook1, Peera Jaru-Ampornpan, Jenny Ni

  • 1Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, 37th and Hamilton Walk, Philadelphia, Pennsylvania 19102-6059, USA.

Nature
|April 25, 2008
PubMed
Resumen

Los investigadores aclararon la estructura del represor lambda cI del bacteriófago unido al ADN. Esta visión estructural explica cómo el represor logra la unión cooperativa, un mecanismo clave en el fago.

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Área de la Ciencia:

  • Biología Molecular Biología Molecular
  • Biología Estructural Biología estructural.
  • Genética La genética.

Sus antecedentes:

  • El bacteriófago lambda es un organismo modelo para el estudio de la regulación génica.
  • Un interruptor genético controla la transición entre el crecimiento lisogénico y lítico.
  • La proteína represora de cI es central para este interruptor genético, que se une a los sitios del operador en el ADN del fago.

Objetivo del estudio:

  • Para determinar la estructura cristalina de rayos X del dimero represor lambda cI unido a un sitio operador de ADN.
  • Comprender las bases estructurales de la cooperación en pares en la unión del represor.

Principales métodos:

  • Cristalografía de rayos X con rayos X.
  • Reemplazo múltiple isomorfo de sustitución.

Principales resultados:

  • Se determinó la estructura cristalina de rayos X del dímero represivo lambda cI intacto unido a un sitio operador de ADN.
  • El represor exhibe una arquitectura general inusual.
  • Esta arquitectura facilita la vinculación cooperativa en pares con sitios de operadores adyacentes.

Conclusiones:

  • La estructura determinada proporciona una explicación molecular para la unión cooperativa del represor lambda cI.
  • Este hallazgo avanza en la comprensión de los mecanismos de regulación génica en el bacteriófago lambda.