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Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

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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.
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Intrinsically Disordered Proteins02:18

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Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
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Protein Folding01:25

Protein Folding

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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
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Conserved Binding Sites01:49

Conserved Binding Sites

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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
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Conservative Site-specific Recombination and Phase Variation02:53

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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Ligand Binding and Linkage00:49

Ligand Binding and Linkage

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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Polipéptido habilitado para SuFEx: Creación de propiedades diversificadas con condiciones mínimas predeterminadas

Ying Liu1,2, Yajie Chen1, Xue-Ao Mei1

  • 1State Key Laboratory of Chemo- and Bio-Sensing, School of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan Province, 410082, China.

Angewandte Chemie (International ed. in English)
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PubMed
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Los investigadores desarrollaron un nuevo método para sintetizar y funcionalizar fácilmente los polipéptidos utilizando la química de intercambio de sulfuro (VI) fluoruro (SuFEx). Este avance permite diseños de biomateriales novedosos con propiedades mejoradas y aplicaciones potenciales, incluida la actividad antiviral.

Palabras clave:
Polímeros antiviralesN-carboxianidruro y sus derivadosFuncionalización del polímeroPolípeptidoSuFEx

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Área de la Ciencia:

  • Química de los polímeros
  • Ciencia de los biomateriales
  • Síntesis orgánica

Sus antecedentes:

  • La síntesis y la funcionalidad de los polipéptidos presentan desafíos significativos, lo que limita la exploración de sus propiedades y aplicaciones.
  • Los métodos existentes a menudo requieren pasos complejos de pre-funcionalización o anclajes reactivos.

Objetivo del estudio:

  • Desarrollar un método fácil y eficaz para la síntesis y la funcionalización de polipéptidos.
  • Incorporar fracciones de intercambio de sulfuro (VI) fluoruro (SuFEx) en polipéptidos para una funcionalización versátil.
  • Explorar las propiedades de los enlaces derivados de SuFEx en polipéptidos para aplicaciones de biomateriales.

Principales métodos:

  • Incorporación de las fracciones de SuFEx en los aminoácidos N-carboxianidritos.
  • La polimerización de apertura de anillo para crear polipéptidos funcionalizados.
  • Modificación de polipéptidos con enlaces de sulfato o amidosulfonato (sulfamato).
  • Evaluación de las propiedades de enlace y de los efectos sinérgicos con las fracciones funcionales.

Principales resultados:

  • Se han sintetizado con éxito polipéptidos con fracciones SuFEx incorporadas.
  • Funcionalización fácil demostrada de polipéptidos utilizando grupos hidroxilo y amino sin condiciones preestablecidas.
  • Propiedades únicas caracterizadas de los enlaces de sulfato y sulfamato derivados de SuFEx.
  • Se demostraron efectos sinérgicos en una prueba de concepto con polipéptidos modificados por sacarídeos que exhiben actividad antiviral y biocompatibilidad.

Conclusiones:

  • La química de SuFEx proporciona una plataforma versátil para la síntesis y la funcionalización de polipéptidos.
  • Los enlaces derivados de SuFEx ofrecen propiedades únicas beneficiosas para el diseño de nuevos biomateriales.
  • Los polipéptidos modificados por sacáridos con enlaces SuFEx muestran una prometedora actividad antiviral y biocompatibilidad.