Video Experimental Relacionado
Updated: Jan 29, 2026

07:36
Autofluorescence Imaging to Evaluate Cellular Metabolism
Published on: November 15, 2021
5.2K
La FMN cíclica es un intermedio detectable y putativo del metabolismo del FAD
Luxene Belfleur1, Juha P Kallio2, Wito Richter3
1Mitchell Cancer Institute, Mass Spectrometry Core Facility, University of South Alabama, Mobile, AL 36604, USA.
Biomolecules
|January 28, 2026
Resumen
Los investigadores sintetizaron 4
Área de la Ciencia:
- Bioquímica
- Química Analítica
Sus antecedentes:
- El metabolismo del dinucleótido de flavina y adenina (FAD) libre produce mononucleótido de flavina (FMN) y monofosfato de adenosina (AMP).
- La ciclasa de FMN de la triosa quinasa (TKFC) convierte el FAD en 4',5'-fosforiboflavina cíclica (cFMN) y AMP.
- La subnotificación de la incidencia de cFMN en muestras biológicas puede deberse a la falta de estándares analíticos.
Objetivo del estudio:
- Sintetizar cFMN para establecerlo como estándar analítico.
- Optimizar las condiciones de reacción para la síntesis eficiente de cFMN a partir de FAD.
- Caracterizar la estabilidad y las propiedades de extracción de cFMN para el análisis de muestras biológicas.
Principales métodos:
- Síntesis de cFMN a partir de FMN o FAD.
- Optimización de la conversión de FAD a cFMN utilizando ZnSO4.
- Análisis de la estabilidad de cFMN en condiciones de pH variables.
- Extracción de cFMN de muestras biológicas para detección por LC-MS.
Principales resultados:
- Se optimizaron las condiciones de reacción utilizando una relación equimolar de ZnSO4 y FAD, lo que produjo cFMN puro.
- Las sales de AMP-Zn precipitaron, facilitando la purificación de cFMN.
- La cFMN demostró estabilidad en condiciones acuosas ácidas y básicas.
- La cFMN se extrae fácilmente de matrices biológicas.
- Se observó la hidrólisis de cFMN a FMN y riboflavina por extractos de hígado, pero los mecanismos no están claros.
Conclusiones:
- Se estableció un método fiable para sintetizar cFMN puro.
- El método desarrollado permite la cuantificación precisa de cFMN en muestras biológicas.
- Se necesita más investigación para dilucidar las vías enzimáticas de la hidrólisis de cFMN en el tejido hepático.
Videos de Conceptos Relacionados
The Intermediate Value Theorem
265
The Intermediate Value Theorem is a foundational result in calculus that guarantees the existence of solutions within certain intervals for continuous functions. Formally, the Intermediate Value Theorem states that if a function f is continuous on the closed interval [a, b], and if N is any value between f(a) and f(b), then there exists at least one c ∈ (a, b) such that f(c) = N. This theorem is instrumental in proving the existence of roots and in analyzing the behavior of continuous...
265
What is Metabolism?
131.7K
Overview
131.7K
Disassembly of Intermediate Filaments
2.7K
Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
2.7K
Types of Intermediate Filaments
4.9K
The intermediate filaments are an essential component of the cytoskeleton. Presently six types of intermediate filament have been identified. Type I and II are acidic and basic keratin proteins. Type III is of mesodermal origin and comprises four proteins: vimentin, desmin, glial fibrillary acidic protein (GFAP), and peripherin. Vimentin is commonly found in mesenchymal cells, desmin in muscle cells, GFAP in astrocytes, while peripherin is found in peripheral nervous system neurons (PNS). Type...
4.9K
Formation of Intermediate Filaments
4.0K
Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been...
4.0K
The Structure of Intermediate Filaments
5.8K
The intermediate filaments are one of three widely studied cytoskeletal filaments. They are so named as their diameter (10 nm) is in between that of microfilaments (7 nm) and the microtubules (25 nm). These filaments are highly stable and can remain intact when exposed to high salt concentrations and detergents. These filaments are responsible for providing stability and mechanical support to the cells. They also help in cell adhesion and maintaining tissue integrity.
Intermediate...
Intermediate...
5.8K

