Video Experimental Relacionado
Updated: Jan 3, 2026
12:07
Chemical Modification of the Tryptophan Residue in a Recombinant Ca2+-ATPase N-domain for Studying Tryptophan-ANS FRET
Published on: October 9, 2021
3.7K
Transferencia ultra rápida de electrones de triptófano a hemo en las mioglobinas revelada por la espectroscopia UV 2D
Cristina Consani1, Gerald Auböck, Frank van Mourik
1Laboratory of Ultrafast Spectroscopy, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.
Science (New York, N.Y.)
|February 9, 2013
Resumen
El triptófano es un triptófano.
Área de la Ciencia:
- La biofísica es la biofísica.
- La bioquímica es la bioquímica.
- La espectroscopia es una técnica de espectroscopia.
Sus antecedentes:
- El triptófano es crucial para estudiar la estructura, la dinámica y el plegamiento de las proteínas.
- La transferencia de energía de resonancia de fluorescencia (FRET) utiliza comúnmente el triptófano como donante.
- La comprensión de las vías de descomposición del estado excitado en las proteínas es esencial.
Objetivo del estudio:
- Para investigar las vías de desintegración del estado excitado de los residuos de triptófano en las mioglobinas férricas.
- Para diferenciar entre los mecanismos de transferencia de energía y de transferencia de electrones.
- Evaluar la prevalencia de las vías de transferencia de electrones observadas en otras proteínas.
Principales métodos:
- Se utilizó espectroscopia bidimensional (2D) ultrarrápida de banda ultra ancha en el rango UV.
- Se empleó la espectroscopia de absorción transitoria en el rango visible.
- Los residuos de aminoácidos de triptófano analizados en las mioglobinas férricas (MbCN y metMb).
Principales resultados:
- Desenredó distintas vías de desintegración en estado excitado para diferentes residuos de triptófano.
- Transferencia de energía identificada de Trp(7) a la heme.
- Se observó la transferencia de electrones dominantes de Trp(14) al hemo (<40 ps, >60% rendimiento cuántico).
Conclusiones:
- Trp(14) la excitación se descompone predominantemente a través de la transferencia de electrones al hemo, superando al FRET.
- Esta transferencia de electrones ocurre rápidamente en distancias cortas (<10 angstroms).
- Los hallazgos sugieren que la transferencia de electrones puede ser una vía de desintegración común en otras proteínas.
Más Videos Relacionados
09:31PCR Mutagenesis, Cloning, Expression, Fast Protein Purification Protocols and Crystallization of the Wild Type and Mutant Forms of Tryptophan Synthase
Published on: September 26, 2020
4.7K
10:03Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
Published on: June 27, 2014
18.3K
Videos de Conceptos Relacionados
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
2.6K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
2.6K
01:02Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
4.3K
Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material, molecules absorb light depending on the energy required for...
4.3K
01:32UV–Vis Spectroscopy of Conjugated Systems
8.1K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in...
One of the factors influencing λmax is the extent of conjugation in...
8.1K
01:14UV–Vis Spectrometers
3.2K
The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
3.2K
01:09UV–Vis Spectroscopy: Beer–Lambert Law
6.4K
The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The modern...
6.4K
01:29UV–Vis Spectroscopy: Woodward–Fieser Rules
27.9K
UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the...
27.9K