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Protein-protein Interfaces02:04

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
Protein-Protein Interfaces02:04

Protein-Protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...

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Analyzing Dynamic Protein Complexes Assembled On and Released From Biolayer Interferometry Biosensor Using Mass Spectrometry and Electron Microscopy
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La disección de complejas interfaces de reconocimiento molecular.

Christopher A Hunter1, Maria Cristina Misuraca, Simon M Turega

  • 1Department of Chemistry, University of Sheffield, Sheffield S3 7HF, United Kingdom. c.hunter@sheffield.ac.uk

Journal of the American Chemical Society
|December 23, 2010
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio cuantifica los enlaces de hidrógeno intramoleculares en complejos supramoleculares. Los resultados muestran que estos enlaces son aditivos y su efectividad depende de la estructura química, no sólo de la geometría.

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Área de la Ciencia:

  • Química supramolecular de las moléculas.
  • Biología Química Biología química.
  • Química Física es la química física.

Sus antecedentes:

  • Los complejos supramoleculares se forman por interacciones no covalentes.
  • Los enlaces de hidrógeno juegan un papel crucial en el reconocimiento molecular y el autoensamblaje.
  • Comprender las contribuciones cuantitativas de las interacciones individuales es clave para diseñar sistemas moleculares complejos.

Objetivo del estudio:

  • Para sintetizar y caracterizar una serie de zinc porfirina-piridina complejos supramoleculares con un número variable de enlaces de hidrógeno intramoleculares.
  • Evaluar cuantitativamente las contribuciones de los enlaces de hidrógeno individuales a la estabilidad general y el ensamblaje de estos complejos.
  • Investigar la relación entre la estructura molecular, el enlace de hidrógeno y la cooperatividad en complejas interfaces de reconocimiento molecular.

Principales métodos:

  • Síntesis de porfirina de zinc y ligandos de piridina con grupos periféricos de enlace de hidrógeno.
  • La titulación automática UV / vis para caracterizar 120 diferentes complejos supramoleculares.
  • Construcción de ciclos químicos de doble mutante para cuantificar las interacciones intramoleculares de enlace de hidrógeno y la molaridad efectiva (EM).

Principales resultados:

  • Las contribuciones de energía libre de los enlaces de hidrógeno individuales son aditivos y muestran poca variación con la arquitectura supramolecular.
  • Los enlaces de hidrógeno intramoleculares están ausentes cuando es geométricamente imposible; una excelente complementariedad no garantiza una alta afinidad.
  • La molaridad efectiva para los enlaces intramoleculares carboxilato éster-fenol H (200 mM) es un orden de magnitud mayor que para los enlaces fosfonato diéster-fenol H (30 mM).

Conclusiones:

  • El estudio revela que los enlaces de hidrógeno intramoleculares son aditivos y su impacto en el ensamblaje es en gran medida independiente de la arquitectura.
  • La complementariedad geométrica por sí sola no dicta una alta afinidad de unión, y la flexibilidad conformacional tiene una influencia limitada en la molaridad efectiva.
  • Las diferencias significativas en la molaridad efectiva entre los tipos de enlaces H sugieren un efecto de compensación, donde los enlaces más fuertes imponen restricciones geométricas más estrictas, lo que afecta la eficiencia de la formación.