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Protein Folding01:22

Protein Folding

Overview
Protein Folding01:25

Protein Folding

Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Amyloid Fibrils03:03

Amyloid Fibrils

Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
Amyloid deposits were observed as early as 1639 in the liver and the spleen.   In 1854, Rudolph Virchow performed iodine staining, normally used to...
Protein Organization01:24

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
Protein Organization01:13

Protein Organization

Overview
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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Updated: May 27, 2026

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

Foldamer estructurado por macromoléculas unidas covalentemente.

Koushik Ghosh1, Jeffrey S Moore

  • 1Department of Chemistry and the Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

Journal of the American Chemical Society
|November 17, 2011
PubMed
Resumen
Este resumen es generado por máquina.

Las grandes macromoléculas unidas a los foldameres de meta-fenileno etileno (mPE) los inducen a colapsar en una estructura helicoidal. Este efecto de plegado es más pronunciado con macromoléculas más grandes, ofreciendo información sobre proteínas intrínsecamente no estructuradas.

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Área de la Ciencia:

  • Química de Polímeros La Química de Polímeros es la química de los polímeros.
  • La biofísica es la biofísica.
  • Ciencias Macromoleculares Ciencias Macromoleculares

Sus antecedentes:

  • Las proteínas intrínsecamente no estructuradas (IUP) juegan un papel crucial en los entornos celulares al interactuar e influir en otras proteínas.
  • Los Foldamers son polímeros sintéticos diseñados para adoptar conformaciones específicas, sirviendo como modelos para las macromoléculas biológicas.

Objetivo del estudio:

  • Para investigar el efecto de las macromoléculas adheridas en el plegamiento conformacional de los oligómeros de meta-fenileno etileno (mPE).
  • Para explorar la dependencia de peso molecular del plegamiento inducido por macromoléculas en foldameres de mPE.
  • Establecer los foldamers de mPE como sistemas modelo para el estudio de la física de las IUP.

Principales métodos:

  • Se empleó espectroscopia de fluorescencia para monitorear los cambios conformacionales.
  • Se utilizó la espectroscopia de absorción electrónica para analizar las propiedades electrónicas relacionadas con la conformación.
  • Los experimentos se llevaron a cabo en dodecameros de mPE con diferentes tamaños de macromoléculas unidas.

Principales resultados:

  • Las macromoléculas unidas a ambos extremos del dodecámero de mPE inducen el colapso en una presunta conformación helicoidal.
  • El efecto de plegado se mejoró significativamente cuando los segmentos de macromoléculas excedieron aproximadamente 50 kDa.
  • La estructuración conformal se observó incluso en disolventes de desnaturalización para macromoléculas adheridas suficientemente grandes.

Conclusiones:

  • Los foldameres centrados en la cadena pueden ser inducidos a plegarse por macromoléculas externas, imitando aspectos del comportamiento de la IUP.
  • El tamaño de la macromolécula inductora es un factor crítico en la extensión del colapso del foldamer.
  • Estos hallazgos apoyan la utilidad de los foldameres como sistemas modelo para la investigación fundamental sobre proteínas intrínsecamente no estructuradas.