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Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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

Cooperative Allosteric Transitions

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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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
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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 dimers that...
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Modulación conformal del reconocimiento de secuencias en macromoléculas sintéticas.

Zhixue Zhu1, Christine J Cardin, Yu Gan

  • 1Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom. zhixue.zhu.rdg@googlemail.com

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Las copolímidas aromáticas con diferentes enlaces éter-cetona y éter-sulfona exhiben distintas afinidades de unión para las moléculas de pinza a base de pireno. Estas diferencias se derivan de las variaciones conformacionales que influyen en las interacciones secundarias de apilamiento π-π.

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Área de la Ciencia:

  • Química de Polímeros La química de los polímeros es la química de los polímeros.
  • Química supramolecular de las moléculas.
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • Las copoliimidas aromáticas de alto peso molecular cuentan con unidades de piromellitimida.
  • Estas unidades están flanqueadas por residuos de éter-cetona (K) o éter-sulfona (S), formando secuencias tripletas como KIK, KIS y SIS.
  • Las moléculas de pinza a base de pireno se unen a estos polímeros a través de apilamiento π-π y enlace de hidrógeno.

Objetivo del estudio:

  • Para investigar las diferentes fuerzas de unión de las moléculas de pinza a base de pireno a diferentes secuencias tripletas de copoliimida aromática.
  • Para dilucidar los mecanismos moleculares que rigen estas afinidades de unión.
  • Para correlacionar las características estructurales de las copolyimidas con sus capacidades de unión.

Principales métodos:

  • Espectroscopia de Resonancia Magnética Nuclear (RMN) para medir los cambios de complejidad.
  • Determinación de las constantes de unión pinza-polímero.
  • Modelado computacional de las interacciones pinza-polímero.
  • Análisis de difracción de rayos X monocristalino de complejos de pinzas.

Principales resultados:

  • La fuerza de unión sigue el orden: SIS > KIS > KIK.
  • (1) Los desplazamientos de complejidad de RMN H y las constantes de unión cuantifican estas diferencias.
  • Los modelos computacionales y la cristalografía de rayos X revelan que las preferencias conformacionales en los enlaces de diarilcetonas y diarilsulfonas son clave.
  • Estas preferencias dictan la ocurrencia de plegamiento de cadenas y apilamiento secundario π-π.

Conclusiones:

  • La flexibilidad conformacional de los anillos aromáticos en los enlaces éter-cetona y éter-sulfona tiene un impacto significativo en la unión pinza-molécula.
  • Las interacciones secundarias de apilamiento π-π juegan un papel crucial en las variaciones de fuerza de unión observadas.
  • La comprensión de estas relaciones estructura-propiedad permite el diseño de materiales supramoleculares avanzados.