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Videos de Conceptos Relacionados

Amines to Amides: Acylation of Amines01:19

Amines to Amides: Acylation of Amines

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Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...
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Amino Acid Catabolism01:18

Amino Acid Catabolism

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Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
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Preparation of Amides01:29

Preparation of Amides

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Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
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Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

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Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
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Ingeniería enzimática de proteínas C-Terminal con aminas

Fabian B H Rehm1, Tristan J Tyler1, Kuok Yap1

  • 1Institute for Molecular Bioscience, Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Queensland, Brisbane, QLD 4072, Australia.

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Resumen

Este estudio introduce un nuevo método quimioenzimático para la modificación de proteínas y péptidos utilizando una transpeptidasa de ingeniería. Este enfoque permite un etiquetado eficiente y específico del sitio con diversas aminas, superando las limitaciones de los métodos anteriores.

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Área de la Ciencia:

  • La bioquímica
  • Biología Química
  • Ingeniería de proteínas

Sus antecedentes:

  • La modificación quimioenzimática permite la generación de conjugados homogéneos para diversas aplicaciones.
  • Los métodos de transpeptidasa existentes se enfrentan a limitaciones que incluyen la preparación de conjugados sintéticos, etiquetas voluminosas y baja rotación de sustrato.

Objetivo del estudio:

  • Desarrollar una estrategia versátil de etiquetado de péptidos/proteínas utilizando una transpeptidasa de ingeniería.
  • Para superar las limitaciones de los métodos actuales de ligadura mediada por transpeptidasa.

Principales métodos:

  • Diseñado una transpeptidasa promiscuo para el etiquetado de asparagina C-terminal.
  • Utilizó aminas disponibles en el mercado para su incorporación irreversible.
  • Aplicaciones demostradas, incluida la preparación de conjugados de proteínas y fármacos, la fusión de proteínas C a C y el etiquetado de proteínas de doble terminal.

Principales resultados:

  • Se logró la incorporación irreversible de diversas aminas en la asparagina terminal C.
  • Se preparó con éxito un conjugado homogéneo de proteínas y fármacos.
  • Generó una fusión de proteínas C a C genéticamente inaccesible.
  • Se ha demostrado el etiquetado secuencial específico del sitio en ambos extremos de la proteína.

Conclusiones:

  • La transpeptidasa diseñada ofrece una plataforma poderosa y versátil para la modificación quimioenzimática de proteínas y péptidos.
  • Esta estrategia amplía el conjunto de herramientas para crear conjugados de proteínas definidos y arquitecturas complejas de proteínas.