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Videos de Conceptos Relacionados

Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Stereoisomerism02:52

Stereoisomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
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Ligand Binding and Linkage00:49

Ligand Binding and Linkage

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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Auto-clasificación gobernada por la cooperativa de los chelatos

David Serrano-Molina1, Carlos Montoro-García1, María J Mayoral1,2

  • 1Nanostructured Molecular Systems and Materials Group, Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain.

Journal of the American Chemical Society
|March 21, 2022
PubMed
Resumen

La cooperatividad del chelato actúa como un código molecular para mejorar la fidelidad de autoclasificación en los sistemas químicos. La fuerte cooperatividad es esencial para la organización molecular precisa y las interacciones predecibles en mezclas complejas.

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Área de la Ciencia:

  • Química supramolecular
  • Ingeniería de Sistemas Químicos
  • Reconocimiento molecular

Sus antecedentes:

  • Los fenómenos de autoclasificación son cruciales en los procesos bioquímicos, ya que dependen de los códigos moleculares para las interacciones selectivas.
  • Comprender las reglas que rigen estos códigos es clave para controlar el ensamblaje molecular.

Objetivo del estudio:

  • Investigar el papel de la cooperatividad del quelato como código molecular para lograr una alta fidelidad de autoclasificación.
  • Establecer relaciones cuantitativas entre la cooperatividad y los resultados de autoclasificación.

Principales métodos:

  • Sistemas cíclicos estudiados con diferentes grados de cooperatividad con el quelato.
  • Interacciones analizadas en mezclas complejas con eventos de unión en competencia.
  • Fidelidad de autoclasificación cuantificada basada en la distribución molecular.

Principales resultados:

  • Se ha demostrado que una fuerte cooperatividad entre los quelatos es un requisito previo para una alta fidelidad de autoclasificación.
  • Demostró la capacidad de la cooperatividad para dictar la distribución cíclica de las especies en las mezclas.
  • El papel ilustrado de la cooperatividad en el gobierno de las interacciones no covalentes intra vs. intermoleculares.

Conclusiones:

  • La cooperatividad del chelato es un código crítico para la auto-clasificación molecular precisa.
  • Los sistemas con una robusta cooperatividad permiten una autoclasificación narcisista cuantitativa.
  • Este hallazgo tiene implicaciones para el diseño de sistemas moleculares complejos y procesos químicos.