Video Experimental Relacionado
Updated: Dec 17, 2025
06:35
Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
8.4K
El intercambio supramolecular entre conjuntos de carga opuesta conduce a estructuras jerárquicas
James R Wester1, Jacob A Lewis1,2, Ronit Freeman1
1Simpson Querrey Institute, Northwestern University, Chicago, Illinois 60611, United States.
Journal of the American Chemical Society
|June 30, 2020
Resumen
La baja cohesión interna en los conjuntos de péptidos promueve la formación de estructuras jerárquicas complejas al permitir el reordenamiento molecular. Este hallazgo es crucial para comprender el ensamblaje de proteínas en los sistemas biológicos.
Área de la Ciencia:
- La biofísica
- Ciencias de los materiales
- Química supramolecular
Sus antecedentes:
- Los conjuntos de proteínas jerárquicas forman estructuras fibrilares en entornos extracelulares fisiológicos y patológicos.
- Estos ensamblajes a menudo implican interacciones entre dominios de péptidos cargados de manera opuesta.
- La relación entre la dinámica de la estructura terciaria y la formación de la estructura jerárquica cuaternaria no se entiende bien.
Objetivo del estudio:
- Para investigar las imitaciones supramoleculares de los sistemas de ensamblaje jerárquico de proteínas.
- Explorar el papel de la cohesión molecular y las interacciones de carga en la formación de superestructuras.
- Comprender la influencia del pH y la secuencia de péptidos en la dinámica del ensamblaje jerárquico.
Principales métodos:
- Mezclar ensamblajes unidimensionales de pequeños péptidos alquilados con cargas opuestas.
- Variando las secuencias de péptidos para modular la cohesión intermolecular.
- Análisis de la formación de superestructuras fibrosas y filamentos agrupados.
Principales resultados:
- Los ensamblajes con interacciones de cohesión débiles formaron fácilmente superestructuras fibrosas a través de la redistribución molecular.
- La baja cohesión facilitó el escape molecular y el reensamblaje en haces electrostáticamente estables.
- Las barreras cinéticas limitaron la formación de estructuras jerárquicas a altas densidades de carga (pH alto).
- El aumento de la cohesión intermolecular (hojas β estables) suprimió la formación de superestructuras.
Conclusiones:
- La baja cohesión interna en los sistemas de proteínas puede facilitar los reordenamientos conformacionales necesarios para la formación de la estructura jerárquica.
- Las dinámicas de intercambio molecular son críticas para construir arquitecturas supramoleculares complejas.
- La comprensión de estos principios puede informar el diseño de nuevos biomateriales y estrategias terapéuticas.
Videos de Conceptos Relacionados
02:16Resonance and Hybrid Structures
24.1K
According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
24.1K
02:42Ionic Crystal Structures
16.5K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
16.5K
03:13Intermolecular Forces
67.9K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
67.9K
02:34Structural Isomerism
21.3K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
21.3K
02:48Ionic Bonding and Electron Transfer
48.2K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
48.2K
02:42Valence Bond Theory
10.8K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
10.8K