Video Experimental Relacionado
Updated: Jul 15, 2026
11:08
A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli
Published on: December 9, 2017
Mejorar la modularidad de las poliquetidas sintasas modulares: transacilación en las poliquetidas sintasas modulares
Pawan Kumar1, Andrew T Koppisch, David E Cane
1Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA.
Journal of the American Chemical Society
|November 20, 2003
Resumen
Los investigadores diseñaron sintasas modulares de policetido mediante la modificación de los dominios de la acil transferasa (AT). Esta estrategia permite un control preciso sobre la incorporación de la unidad extensor, lo que permite la síntesis de nuevos análogos de productos naturales de policetida.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología sintética Biología sintética.
- Síntesis de Productos Naturales.
Sus antecedentes:
- Las poliquetidas sintasas modulares (PKS) ensamblan productos naturales complejos.
- Los dominios de la aciltransferasa (AT) controlan la selección de las unidades extensoras.
- La modulación de la especificidad del dominio AT es clave para crear nuevos análogos de policetida.
Objetivo del estudio:
- Desarrollar un método para el control preciso de la selección de la unidad extensor en PKS modular.
- Diseñar un PKS para la síntesis específica del sitio de policetidas modificadas.
- Para investigar el uso de la transacilasa malonil-CoA:ACP para la biosíntesis de policeturo por ingeniería.
Principales métodos:
- Diseñó un mutante AT-nulo de la 6-deoxyeritronolide B sintasa.
- Utilizó la transacilasa malonil-CoA:ACP para cargar grupos de malonil en el dominio de la proteína portadora de acilo (ACP).
- Se evaluó la producción de 2-desmetil-6-deoxyeritronolide B in vitro e in vivo.
Principales resultados:
- Se ha demostrado el éxito de la modificación específica del sitio de los policetidos utilizando la estrategia de transacilación.
- La sintetasa 6-deoxyeritronolide B de ingeniería produjo exclusivamente el 2-desmetil-6-deoxyeritronolide B.
- Se ha logrado una productividad comparable a la de la sintasa de tipo silvestre.
Conclusiones:
- La transacilación de grupos malonilo en PKS AT-nulo es una estrategia efectiva para la biosíntesis de policetida de ingeniería.
- Este método permite un control preciso sobre la incorporación de la unidad extensor.
- Permite la biosíntesis eficiente de nuevos análogos de productos naturales con aplicaciones terapéuticas potenciales.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:27Cofactors and Coenzymes
Enzymes require additional components for proper function. There are two such classes of molecules: cofactors and coenzymes. Cofactors are metallic ions and coenzymes are non-protein organic molecules. Both of these types of helper molecule can be tightly bound to the enzyme or bound only when the substrate binds.
01:07Acid Halides to Amides: Aminolysis
Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
01:11Electrophilic Aromatic Substitution: Friedel–Crafts Acylation of Benzene
The Friedel–Crafts acylation reactions involve the addition of an acyl group to an aromatic ring. These reactions proceed via electrophilic aromatic substitution by employing an acyl chloride and a Lewis acid catalyst such as aluminum chloride to form aryl ketone.
01:24Cofactors and Coenzymes
Enzymes are proteins made of amino acids. The functional group of each constituent amino acid catalyzes a wide variety of chemical reactions via ionic interactions or acid-base reactions. However, amino acids cannot catalyze oxidation-reduction and group transfer reactions and need to be aided by non-protein components called cofactors. Cofactors are also referred to as the chemical teeth of an enzyme.
Cofactors can be metallic ions or organic molecules called coenzymes. These types of helper...
Cofactors can be metallic ions or organic molecules called coenzymes. These types of helper...
01:19Amines to Amides: Acylation of Amines
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 amide...
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary amide...
01:29Amino Acid Biosynthetic Pathways
Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which provide...