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Videos de Conceptos Relacionados

Catenins01:23

Catenins

Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the adherens...
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
Structure of Cadherins01:25

Structure of Cadherins

The cadherins were one of the first cell adhesion molecules discovered; the term “cadherins”   is based on their calcium-dependent adhering properties. The first cadherins discovered on the epithelial, neuronal, and placental cells were named E-cadherin, P-cadherin, and N-cadherin, respectively. These classical cadherins share sequence and structural similarities. Other cadherins, including those involved in cell signaling, are grouped into non-classical cadherins. This diversity of cadherins...

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Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules
09:32

Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules

Published on: April 12, 2019

Una nueva cadena doblemente entrelazada [2]

Carlos Peinador1, Víctor Blanco, José M Quintela

  • 1Departamento de Quimica Fundamental, Facultad de Ciencias, Universidade da Coruna. Campus A Zapateira, 15071, A Coruna, Spain. capeveqo@udc.es; jqqoqf@udc.es

Journal of the American Chemical Society
|January 2, 2009
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores informan de un nuevo enlace molecular de Salomón, un doble trenzado [2]catenane. Esta compleja molécula fue creada utilizando un proceso de autoensamblaje de cinco componentes.

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Área de la Ciencia:

  • Química supramolecular de las moléculas.
  • Ingeniería de Cristal Ingeniería de Cristal.
  • Síntesis orgánica La síntesis orgánica.

Sus antecedentes:

  • Las catenanas son moléculas mecánicamente entrelazadas con propiedades topológicas únicas.
  • El trenzado molecular y los enlaces de Salomón representan arquitecturas avanzadas en química supramolecular.
  • El autoensamblaje ofrece una poderosa estrategia para la construcción de estructuras moleculares complejas.

Objetivo del estudio:

  • Para sintetizar y caracterizar una novela doblemente trenzada [2]catenane.
  • Para investigar la formación de un enlace molecular de Salomón a través de un proceso de autoensamblaje de múltiples componentes.
  • Para dilucidar la estructura cristalina del catenano sintetizado.

Principales métodos:

  • Utilizando una estrategia de autoensamblaje de cinco componentes.
  • Empleando enlaces coordinativos, interacciones pi-donante/pi-aceptante y enlaces de hidrógeno como fuerzas motrices.
  • Caracterización del producto a través de la cristalografía de rayos X.

Principales resultados:

  • Síntesis exitosa de un doble trenzado [2]catenane.catenane.
  • Confirmación de la topología de enlaces moleculares de Salomón.
  • Un análisis detallado de la estructura cristalina revela el intrincado trenzado.

Conclusiones:

  • El estudio demuestra un enfoque novedoso para la construcción de arquitecturas complejas de catenana.
  • Los hallazgos amplían el alcance del trenzado molecular y la química topológica.
  • El enlace Solomon reportado proporciona una nueva plataforma para explorar materiales moleculares avanzados.