Video Experimental Relacionado

Updated: Jun 21, 2026

Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins

Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins

Published on: September 23, 2021

[Ln(DPA) ((3))) ((3-) es un reactivo de desplazamiento paramagnético conveniente para los estudios de RMN de

Xun-Cheng Su¹, Haobo Liang, Karin V Loscha

¹Research School of Chemistry, Australian National University, Canberra, Australia.

Journal of the American Chemical Society

|July 10, 2009

Resumen

Nuevos complejos de lantánidos paramagnéticos se unen a las proteínas de forma no covalente para la biología estructural de RMN. Estos reactivos facilitan el refinamiento de la estructura y las mediciones de acoplamiento dipolar residual, ayudando a la determinación de la estructura de las proteínas.

Área de la Ciencia:

La bioquímica es la bioquímica.
Biología Estructural Biología estructural.
Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN) Espectroscopia de Resonancia Magnética Nuclear (RMN)

Sus antecedentes:

Los iones de lantánidos paramagnéticos son herramientas valiosas en la espectroscopia de RMN para la biología estructural.
El etiquetado de proteínas específicas del sitio es crucial para el análisis estructural detallado.

Objetivo del estudio:

Desarrollar y caracterizar nuevos reactivos paramagnéticos para la determinación de la estructura de las proteínas.
Para permitir la unión no covalente específica del sitio a las proteínas para los estudios de RMN.

Principales métodos:

Formación de complejos 3:1 entre el ácido dipicolinico y los lantánidos.
Experimentos de titulación para observar cambios en el desplazamiento químico.
Medición de desplazamientos de pseudocontacto y acoplamientos dipolares residuales.

Principales resultados:

Desarrolló complejos paramagnéticos de ácido lantánido-dipicolínico que se unen a las proteínas de forma específica del sitio sin enlaces covalentes.
Utilidad demostrada para el refinamiento de la estructura a través de desplazamientos de pseudocontacto interpretables.
Asignación de resonancia facilitada a través de una dinámica de intercambio rápido.
Medidas de acoplamiento dipolar residual habilitadas sin modificación de proteínas.

Conclusiones:

Los complejos paramagnéticos de lantánido-ácido dipicolínico son reactivos versátiles para la biología estructural.
Estos reactivos simplifican la determinación de la estructura de las proteínas mediante la espectroscopia de RMN.
La unión no covalente y la recuperación de muestras mediante diálisis ofrecen ventajas prácticas.

Más Videos Relacionados

15N CPMG Relaxation Dispersion for the Investigation of Protein Conformational Dynamics on the µs-ms Timescale

¹⁵N CPMG Relaxation Dispersion for the Investigation of Protein Conformational Dynamics on the µs-ms Timescale

Published on: April 19, 2021

Videos de Conceptos Relacionados

Other Nuclides: 31P, 19F, 15N NMR

Other Nuclides: ³¹P, ¹⁹F, ¹⁵N NMR

Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a high...

NMR Spectroscopy Of Amines

NMR Spectroscopy Of Amines

In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is broad and...

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...

¹H NMR: Pople Notation

¹H NMR: Pople Notation

The Pople nomenclature system classifies spin systems based on the difference between their chemical shifts. Coupled spins are denoted by capital letters with subscripts indicating the number of equivalent nuclei. When the coupled nuclei have well-separated chemical shifts, they are assigned letters that are far apart in the alphabet, such as A and X. When the difference in chemical shifts is small, coupled nuclei are named using adjacent letters of the alphabet (AB, MN, or XY).
A proton...

¹H NMR: Interpreting Distorted and Overlapping Signals

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...