Video Experimental Relacionado
Updated: Jun 9, 2026
04:22
Sample Preparation using a Lipid Monolayer Method for Electron Crystallographic Studies
Published on: November 20, 2021
Apego de cristales de monohidrato de oxalato de calcio en superficies con patrones de proteínas y bicapas de lípidos
Zhihua An1, Soolim Lee, Harry Oppenheimer
1Department of Chemistry and Molecular Design Institute, New York University, 100 Washington Square East, New York, New York 10003-6688, USA.
Journal of the American Chemical Society
|September 4, 2010
Resumen
La unión de los cristales de monohidrato de oxalato de calcio (COM) a los túbulos renales es clave en la formación de cálculos. La osteopontina (OPN) en la orina puede reducir la adhesión de los cristales COM a las células renales, lo que podría prevenir los cálculos renales.
Área de la Ciencia:
- Ciencia de los Biomateriales Ciencia de los Biomateriales.
- Fisiología renal Fisiología renal.
- Estudios de cristalización Estudios de cristalización
Sus antecedentes:
- La formación de cálculos renales implica la fijación de cristales de oxalato de calcio monohidrato (COM) a los túbulos renales.
- La osteopontina (OPN) es una proteína urinaria que puede influir en la agregación de cristales COM.
- Comprender las interacciones moleculares en la superficie del túbulo renal es crucial para la investigación de cálculos renales.
Objetivo del estudio:
- Para crear superficies con patrones que imiten los entornos de los túbulos renales.
- Investigar la fijación preferencial de los cristales COM a las biomoléculas específicas.
- Explorar el papel de la OPN en la modulación de la adhesión de los cristales COM.
Principales métodos:
- Fabricación de patrones de fosfatidilserina organizada espacialmente (DPPS) y OPN en sustratos de sílice.
- Utilizando la impresión de microcontacto y las técnicas de fusión de vesículas lipídicas.
- Visualización y análisis directos de la fijación de cristales COM de tamaño micrométrico a superficies con patrones.
Principales resultados:
- Cristales COM preferentemente unidos a regiones ricas en OPN en superficies con patrones.
- Los cristales COM mostraron una adhesión similar solo a las superficies OPN y DPPS.
- La OPN libre se adsorbe en los cristales COM, suprimiendo su adherencia a las superficies de DPPS.
Conclusiones:
- La adhesión preferencial de los cristales COM a las regiones OPN sugiere interacciones reversibles.
- La capacidad de OPN para suprimir la unión de los cristales COM al DPPS indica un papel protector contra la adhesión renal.
- El protocolo de modelado desarrollado ofrece una plataforma para estudiar los efectos biomoleculares en la fijación de cristales COM y la patogénesis de los cálculos renales.
Videos de Conceptos Relacionados
00:59Mechanisms of Membrane Domain Formation
Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...
01:18Membrane Domains
The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the anterior...
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the anterior...
01:32Lipids as Anchors
In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains the...
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains the...
01:19Fluid Mosaic Model
Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich with the analogy of...
01:26Membrane Fluidity
Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...
01:12Clathrin Coated Vesicles
Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...