Video Experimental Relacionado
Updated: Jul 1, 2026
12:32
High-resolution Respirometry to Measure Mitochondrial Function of Intact Beta Cells in the Presence of Natural Compounds
Published on: January 23, 2018
Reactivación sintonizable de la beta-galactosidasa inhibida por nanopartículas por el glutatión en concentraciones
Ayush Verma1, Joseph M Simard, Joseph W E Worrall
1Department of Chemistry, University of Massachusetts, 710 North Pleasant Street, Amherst, Massachusetts 01003, USA.
Journal of the American Chemical Society
|October 28, 2004
Resumen
Los grupos cargados positivamente inhiben la beta-galactosidasa, con liberación sintonizable por la longitud de la cadena monocapa. El glutatión (GSH) restauró la actividad enzimática, lo que demuestra el potencial para el suministro controlado de proteínas y medicamentos.
Área de la Ciencia:
- Nanotecnología La nanotecnología es la nanotecnología.
- La bioquímica es la bioquímica.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Los grupos protegidos de monocapa mixta (MMPC) ofrecen propiedades de superficie sintonizables.
- La inmovilización enzimática es crucial para diversas aplicaciones biotecnológicas.
- El control de la liberación de enzimas es clave para los sistemas de administración dirigidos.
Objetivo del estudio:
- Para investigar la unión y liberación de la beta-galactosidasa utilizando MMPCs funcionalizados.
- Para determinar el efecto de la longitud de la cadena monocapa en la inhibición y liberación de enzimas.
- Para explorar el potencial del glutatión (GSH) como un desencadenante para la liberación de enzimas.
Principales métodos:
- Síntesis de MMPCs funcionalizados con trimetilamonio con longitudes de cadena C(8) y C(11).
- La unión de la beta-galactosidasa a los MMPC a través de interacciones electrostáticas.
- Evaluación de la actividad enzimática y la inhibición.
- Evaluación de la liberación de enzimas desencadenadas por diferentes concentraciones de glutatión (GSH).
Principales resultados:
- La inhibición completa de la beta-galactosidasa se logró al unirse a los MMPC.
- La actividad enzimática fue restaurada por las concentraciones intracelulares de GSH para C(8) MMPCs, pero no para C(11) MMPCs.
- La liberación dependía de la concentración de GSH y la longitud de la cadena monocapa, con una liberación mínima en los niveles extracelulares de GSH.
Conclusiones:
- La liberación de enzimas mediadas por GSH de los MMPC puede ser modulada ajustando la estructura monocapa.
- La longitud de la cadena MMPC es un factor crítico en el control de la cinética de unión y liberación de enzimas.
- Estos hallazgos resaltan el potencial de los MMPC para aplicaciones de administración controlada de proteínas y medicamentos.
Videos de Conceptos Relacionados
00:46Feedback Inhibition
Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!
01:30Enzyme Inhibition
Inhibitors are molecules that reduce enzyme activity by binding to the enzyme. In a normally functioning cell, enzymes are regulated by a variety of inhibitors. Drugs and other toxins can also inhibit enzymes. Some inhibitors bind to the enzyme’s active site, while others inhibit enzymatic activity by binding to other sites on the protein structure.
01:58Cell Specific Gene Expression
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
01:19Regulation of Metabolism
Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
01:12GPCR Desensitization
G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
01:27Feedback Regulation of Calcium Concentration
Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...