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Type IV Collagen of Basal Lamina

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A type IV collagen molecule has six alpha chains which can exist in...
Collagens are the Major Structural Proteins of ECM01:13

Collagens are the Major Structural Proteins of ECM

Three main types of fibers are secreted by fibroblasts: collagen fibers, elastic fibers, and reticular fibers. Collagen fiber is made from fibrous protein subunits linked together to form a long, straight fiber. Collagen fibers, while flexible, have great tensile strength, resist stretching, and give ligaments and tendons their characteristic resilience and strength. These fibers hold connective tissues together, even during the body's movement.
Connective tissue proper includes loose...
Fibril-associated Collagen01:11

Fibril-associated Collagen

Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
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Structural Protein Function01:56

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Fibrous Proteins

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Protein Complexes with Interchangeable Parts

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In vitro Synthesis of Native, Fibrous Long Spacing and Segmental Long Spacing Collagen
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Published on: September 20, 2012

Una sola composición sin hidroxiprolina sin ABC colágeno heterotrimer.

Abhishek A Jalan1, Borries Demeler, Jeffrey D Hartgerink

  • 1Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, USA.

Journal of the American Chemical Society
|April 12, 2013
PubMed
Resumen

Este estudio creó un imitador de colágeno estable y libre de hidroxiprolina utilizando péptidos cargados. Esta triple hélice de autoensamblaje demuestra el potencial de los puentes de sal para estabilizar las estructuras de colágeno sin modificación de prolina.

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In vitro Synthesis of Native, Fibrous Long Spacing and Segmental Long Spacing Collagen
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Published on: September 20, 2012

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Published on: January 21, 2014

Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Ciencia de los materiales Ciencia de los materiales.
  • Biología Estructural Biología estructural.

Sus antecedentes:

  • La hidroxiprolina es crucial para la estabilidad térmica del colágeno eucariota y el plegamiento adecuado.
  • Los colágenos bacterianos, que carecen de hidroxiprolina, logran una estabilidad comparable a través de los aminoácidos cargados.
  • Existen desafíos en la incorporación de hidroxiprolina en ciertos sistemas de expresión.

Objetivo del estudio:

  • Desarrollar un sistema de imitación de colágeno térmicamente estable y libre de hidroxiprolina.
  • Investigar el papel de las interacciones electrostáticas en la estabilización de las triple hélices de colágeno.
  • Para demostrar una estructura de colágeno heterotrimérico de autoensamblaje sin modificación de prolina.

Principales métodos:

  • Diseño y síntesis de péptidos decapositivos, decanegativos y zwitteriónicos.
  • Formación de un complejo heterotrimérico ABC.
  • Caracterización mediante dicroísmo circular (CD) y espectroscopia de resonancia magnética nuclear (RMN).
  • Evaluación de la estabilidad térmica a través de la determinación de la temperatura de fusión.

Principales resultados:

  • Se construyó con éxito un colágeno ABC heterotrimérico estable y sin hidroxiprolina que imitaba al colágeno.
  • El heterotrimero está estabilizado por múltiples puentes de sal interpeptídicas lisina-aspartato y lisina-glutamato.
  • El sistema exhibe una buena estabilidad térmica con una temperatura de fusión de 37 °C.
  • CD y RMN confirmaron la formación de un heterotrimero ABC de una sola composición.

Conclusiones:

  • Los puentes de sal axial son herramientas poderosas para dirigir y estabilizar el autoensamblaje de triple hélice.
  • Este sistema libre de hidroxiprolina ofrece una alternativa viable para el diseño de colágeno donde la incorporación de prolina es difícil.
  • Los hallazgos tienen implicaciones para el diseño de nuevos biomateriales y estructuras de proteínas.