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Fibril-associated Collagen01:11

Fibril-associated Collagen

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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.
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
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Type IV Collagen of Basal Lamina01:05

Type IV Collagen of Basal Lamina

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Type IV collagen is a 400 nm long, network-forming collagen that acts as a barrier between the epithelial and endothelial cells. Type IV collagen  forms the backbone of the basement membrane by scaffolding with laminin, entactin, proteoglycans, and fibronectin. Apart from rendering structural support to the basement membrane, it also helps entail signaling potentials necessary for both pathological and physiological functions.
A type IV collagen molecule has six alpha chains which can...
3.3K
Collagens are the Major Structural Proteins of ECM01:13

Collagens are the Major Structural Proteins of ECM

6.2K
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...
6.2K
Structural Protein Function01:56

Structural Protein Function

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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity.  In bones and teeth, it mineralizes to...
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Protein Folding01:22

Protein Folding

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Overview
129.9K
Protein Folding01:25

Protein Folding

12.1K
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...
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Updated: Mar 18, 2026

Preparation of 3D Collagen Gels and Microchannels for the Study of 3D Interactions In Vivo
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Preparation of 3D Collagen Gels and Microchannels for the Study of 3D Interactions In Vivo

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Solución general para estabilizar el colágeno triple helicoidal

Yitao Zhang1, Madison Herling1, David M Chenoweth1

  • 1Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States.

Journal of the American Chemical Society
|July 14, 2016
PubMed
Resumen
Este resumen es generado por máquina.

El reemplazo de la glicina por aza-glicina en los péptidos de colágeno mejora la estabilidad y el autoensamblaje a través de un enlace de hidrógeno adicional. Esta estrategia optimiza los materiales peptídicos diseñados y estabiliza la triple hélice de colágeno.

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Área de la Ciencia:

  • La bioquímica
  • Ciencias de los materiales
  • Biología estructural

Sus antecedentes:

  • Los enlaces de hidrógeno son cruciales para la estructura y la estabilidad biomolecular.
  • Los bloques de construcción de proteínas de la naturaleza tienen limitaciones debido a la dependencia del enlace de hidrógeno.
  • La estructura del colágeno está estabilizada por enlaces de hidrógeno, siendo la glicina un residuo conservado.

Objetivo del estudio:

  • Investigar el impacto de la sustitución de la glicina por la aza-glicina en los péptidos de colágeno.
  • Para explorar las consecuencias sobre la estabilidad del péptido de colágeno y el autoensamblaje.
  • Desarrollar una nueva estrategia para estabilizar las hélices triples de colágeno y diseñar materiales peptídicos.

Principales métodos:

  • Síntesis de péptidos de colágeno con sustituciones de aza-glicina.
  • Análisis de la estabilidad del péptido y de las propiedades de autoensamblaje.
  • Caracterización de los cambios estructurales inducidos por la aza-glicina.

Principales resultados:

  • La sustitución de aza-glicina mejora significativamente la estabilidad del péptido de colágeno y su autoensamblaje.
  • La sustitución completa de los residuos de glicina es posible con aza-glicina.
  • Se lograron los sistemas de péptidos de colágeno autoensamblados más pequeños.
  • Demostró la importancia del enlace de hidrógeno en las interfaces desolvadas.

Conclusiones:

  • La aza-glicina proporciona un donante de enlace de hidrógeno adicional, mejorando la estabilidad del colágeno.
  • Esta modificación ofrece una nueva estrategia para optimizar los materiales peptídicos diseñados.
  • Se identificó una solución general para estabilizar la triple hélice de colágeno.