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Videos de Conceptos Relacionados

Nuclear Magnetic Resonance (NMR): Overview01:07

Nuclear Magnetic Resonance (NMR): Overview

Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
NMR spectroscopy generates a spectrum where the characteristic absorption frequencies of the sample are...
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
Applications Of NMR In Biology01:25

Applications Of NMR In Biology

Nuclear magnetic resonance (NMR) spectroscopy is a very valuable analytical technique for researchers. It has been used for more than 50 years as an analytical tool. F. Bloch and E. Purcell formulated NMR in 1946 and won the 1952 Nobel Prize in Physics  for their work. Biological macromolecules such as proteins, nucleic acids, lipids, and organic molecules including pharmaceutical compounds, can be studied using this versatile tool that exploits the magnetic properties of certain nuclei.
The...
NMR Spectroscopy Of Amines01:19

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...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

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FAST-NMR: tecnología de detección de anotaciones funcionales utilizando espectroscopia de RMN.

Kelly A Mercier1, Michael Baran, Viswanathan Ramanathan

  • 1Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA.

Journal of the American Chemical Society
|November 23, 2006
PubMed
Resumen

Un nuevo método FAST-NMR utiliza las interacciones proteína-ligando para determinar la función de proteínas desconocidas. Este enfoque analiza los sitios activos para identificar roles biológicos, incluso sin similitud de secuencia.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Estructural Biología estructural.
  • Biología Química Biología química.

Sus antecedentes:

  • La genómica estructural y la Protein Structure Initiative (PSI) generan muchas estructuras de proteínas que carecen de anotaciones funcionales claras debido a la ausencia de secuencia u homología estructural.
  • La asignación de funciones a estas nuevas proteínas es crucial para comprender las vías biológicas y desarrollar nuevas terapias.

Objetivo del estudio:

  • Desarrollar y demostrar una metodología de Resonancia Magnética Nuclear (RMN) de alto rendimiento, denominada FAST-NMR, para anotar la función biológica de proteínas no caracterizadas.
  • Aprovechar las interacciones proteína-ligando como base para la asignación funcional, independientemente de la secuencia global o la similitud estructural.

Principales métodos:

  • Un enfoque de detección de RMN por niveles que utiliza una biblioteca de compuestos biológicamente activos para identificar las interacciones proteína-ligando.
  • Determinación de una co-estructura rápida mediante la integración de datos de alteración de desplazamiento químico de RMN (identificación de sitios de unión de ligando) con el acoplamiento de ligando y proteína de AutoDock.
  • Utilizando el software y la base de datos CPASS (Comparison of Protein Active Site Structures) para comparar los sitios activos identificados con una base de datos de proteínas con funciones conocidas.

Principales resultados:

  • La metodología FAST-NMR identificó con éxito roles funcionales potenciales para proteínas no anotadas mediante el análisis de sus sitios activos de unión de ligandos.
  • El enfoque demostró su eficacia utilizando la proteína no anotada SAV1430 de Staphylococcus aureus como un caso de prueba.
  • La integración de datos experimentales de RMN con acoplamiento computacional y comparación de bases de datos proporcionó un método robusto para la anotación funcional.

Conclusiones:

  • FAST-NMR ofrece una poderosa solución de alto rendimiento para asignar funciones a nuevas proteínas que surgen de los esfuerzos de genómica estructural.
  • El principio de que funciones similares se correlacionan con sitios activos similares e interacciones de unión de ligandos es cierto, incluso para proteínas con estructuras globales divergentes.
  • Esta metodología avanza significativamente la capacidad de anotar el proteoma y comprender la función de la proteína en ausencia de información de homología tradicional.