Video Experimental Relacionado
Updated: Jul 14, 2026
13:06
Improved In-gel Reductive β-Elimination for Comprehensive O-linked and Sulfo-glycomics by Mass Spectrometry
Published on: November 20, 2014
Principios de la arquitectura de las mucinas: estudios estructurales sobre glicopéptidos sintéticos que contienen
Don M Coltart1, Ajay K Royyuru, Lawrence J Williams
1Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota Medical School, Minneapolis, Minnesota 55455, USA.
Journal of the American Chemical Society
|August 15, 2002
Resumen
Los estudios de RMN revelan que los glicanos ligados a alfa-O en los glicopéptidos CD43 crean una estructura definida. Esta estructura central, crucial para la visualización de glicanos, no se ve afectada por los enlaces beta.
Área de la Ciencia:
- Glucobiología Glucobiología.
- Biología Estructural Biología estructural.
- La bioquímica es la bioquímica.
Sus antecedentes:
- La glicoproteína de la superficie celular CD43 juega un papel en la adhesión celular y las respuestas inmunes.
- Los dominios de la mucina están fuertemente O-glicosilados, lo que influye en la estructura y función de las proteínas.
- Comprender la estructura de los glicopéptidos es clave para descifrar sus funciones biológicas.
Objetivo del estudio:
- Para investigar las características estructurales de los motivos de mucina glicopéptido de CD43.3.
- Para determinar el impacto de diferentes enlaces de O-glucosilación (alfa frente a beta) en la conformación del glicopéptido.
- Para aclarar el papel del núcleo de glicopéptido en la organización de los antígenos de carbohidratos adjuntos.
Principales métodos:
- Síntesis química total de varias construcciones de glicopéptido CD43.
- Espectroscopia de Resonancia Magnética Nuclear (RMN) para el análisis estructural.
- Cálculos de dinámica molecular restringida para resolver estructuras en 3D.
Principales resultados:
- Se identificó una conformación de núcleo de glicopéptido definida para los glicopéptidos ligados a alfa-O.
- Esta estructura central se establece por las interacciones entre el péptido y el residuo inicial de N-acetilgalactosamina.
- La alfa-O-glucosilación tiene un impacto significativo en la columna vertebral del péptido, mientras que los enlaces beta tienen un efecto mínimo.
- La estructura del núcleo sirve como un marco común para la exhibición de diversos glicanos.
Conclusiones:
- El modo de enlace de O-glucosilación determina críticamente la estructura de los glicopéptidos.
- Los glicanos ligados a alfa-O imponen una conformación específica en la columna vertebral del glicopéptido CD43.
- La estructura del núcleo del glicopéptido es fundamental para presentar diversos epítopos de carbohidratos.
Videos de Conceptos Relacionados
01:44What are Carbohydrates?
Overview
03:25Chemistry of Carbohydrates
Carbohydrates are an essential part of the diet in humans and animals. Grains, fruits, and vegetables are natural sources of carbohydrates that provide energy to the body, particularly through glucose, a simple sugar that is a component of starch and an ingredient in many staple foods. The stoichiometric formula (CH2O)n, where n is the number of carbons in the molecule represents carbohydrates. In other words, the ratio of carbon to hydrogen to oxygen is 1:2:1 in carbohydrate molecules. This...
02:15Protein and Protein Structure
Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme can...
A protein's shape is critical to its function. For example, an enzyme can...
03:25Chemistry of Carbohydrates
Carbohydrates are an essential part of the diet in humans and animals. Grains, fruits, and vegetables are natural sources of carbohydrates that provide energy to the body, particularly through glucose, a simple sugar that is a component of starch and an ingredient in many staple foods. The stoichiometric formula (CH2O)n, where n is the number of carbons in the molecule represents carbohydrates. In other words, the ratio of carbon to hydrogen to oxygen is 1:2:1 in carbohydrate molecules. This...
01:28Structures of Carboxylic Acid Derivatives
Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...
03:25Chemistry of Carbohydrates
Carbohydrates are an essential part of the diet in humans and animals. Grains, fruits, and vegetables are natural sources of carbohydrates that provide energy to the body, particularly through glucose, a simple sugar that is a component of starch and an ingredient in many staple foods. The stoichiometric formula (CH2O)n, where n is the number of carbons in the molecule represents carbohydrates. In other words, the ratio of carbon to hydrogen to oxygen is 1:2:1 in carbohydrate molecules. This...