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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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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...
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Negative Regulator Molecules01:23

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Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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Video Experimental Relacionado

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A Semi-High-Throughput Adaptation of the NADH-Coupled ATPase Assay for Screening Small Molecule Inhibitors
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Los umbrales y la hipersensibilidad de la cooperatividad negativa

S H Ha1, J E Ferrell2

  • 1Department of Chemical and Systems Biology, Stanford University School of Medicine, Stanford, CA 94305-5174, USA.

Science (New York, N.Y.)
|May 14, 2016
PubMed
Resumen
Este resumen es generado por máquina.

La cooperatividad negativa en la unión al receptor puede crear respuestas biológicas altamente ultrasensibles con umbrales, especialmente cuando los ligandos se unen con alta afinidad. Este mecanismo es crucial para comportamientos biológicos complejos como la bistabilidad y las oscilaciones.

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Área de la Ciencia:

  • La bioquímica
  • Biología de sistemas
  • Biología molecular

Sus antecedentes:

  • La cooperatividad negativa describe la reducción de la afinidad de unión del ligando después de la unión inicial a los receptores multiméricos.
  • Este fenómeno generalmente da como resultado una respuesta del receptor más graduada.

Objetivo del estudio:

  • Investigar el impacto de la cooperatividad negativa en la dinámica receptor-ligando bajo condiciones específicas.
  • Explorar el potencial de la cooperación negativa para generar respuestas biológicas ultrasensibles.

Principales métodos:

  • Modelado teórico de las interacciones receptor-ligando.
  • Análisis de los resultados experimentales relativos a la afinidad de unión y el agotamiento del ligando.

Principales resultados:

  • La cooperatividad negativa, combinada con una alta afinidad del ligando y un agotamiento significativo del ligando, produce una respuesta del receptor altamente ultrasensible.
  • Esta ultrasensibilidad se caracteriza por un efecto de umbral pronunciado.

Conclusiones:

  • La cooperatividad negativa puede impulsar respuestas biológicas cualitativamente diferentes más allá de los simples cambios graduados.
  • La interacción de la cooperatividad negativa, la alta afinidad y el agotamiento del ligando es crítica para generar la ultrasensibilidad y los umbrales.
  • Estas respuestas ultrasensibles son fundamentales para los sistemas biológicos complejos, incluyendo la bistabilidad y las oscilaciones, destacando la importancia de la cooperatividad negativa en la regulación biológica.