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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...
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.
¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons01:03

¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons

Protons in identical electronic environments within a molecule are chemically equivalent and have the same chemical shift. The replacement test is a useful tool to identify chemical equivalence and predict NMR spectra. A substituent replaces each of the protons being examined and the resulting molecules are compared. If the same molecule is obtained, the protons are equivalent or homotopic. Replacement of any hydrogens in ethane by chlorine yields chloroethane because all six protons are...
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...
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Relación de actividad de la estructura por RMN y por computadora: un estudio comparativo.

Finton Sirockin1, Christian Sich, Sabina Improta

  • 1Contribution from the Laboratoire de Biologie et Génomique Structurales, UMR 7104, Ecole Supérieure de Biotechnologie de Strasbourg, Boulevard S. Brant, FR-67400 Illkirch, France.

Journal of the American Chemical Society
|September 13, 2002
PubMed
Resumen
Este resumen es generado por máquina.

La espectroscopia de resonancia magnética nuclear (RMN) y los métodos computacionales se utilizaron para identificar los sitios de unión de ligando en FKBP12. Los enfoques computacionales predijeron con éxito las posiciones de los ligandos que coincidían con las restricciones experimentales del Efecto Nuclear Overhauser (NOE).

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Área de la Ciencia:

  • La biofísica es la biofísica.
  • Química computacional es la química computacional.
  • Biología Estructural Biología estructural.

Sus antecedentes:

  • La espectroscopia de Resonancia Magnética Nuclear (RMN) se utiliza cada vez más para mapear los sitios de unión de ligando en las macromoléculas.
  • Los enfoques modulares implican la identificación de pequeños sitios de unión de ligandos y su ensamblaje en moléculas de mayor afinidad.
  • Estrategias similares se aplican en el diseño de fármacos in silico para ensamblar ligandos de grupos químicos favorables.

Objetivo del estudio:

  • Para comparar métodos experimentales y computacionales para identificar sitios de unión de ligandos.
  • Para validar las predicciones computacionales contra los datos de RMN para una proteína diana específica, FKBP12.
  • Para evaluar la precisión de los métodos computacionales en la clasificación de las posiciones de los ligandos basados en restricciones experimentales.

Principales métodos:

  • Se utilizó la espectroscopia de RMN para identificar los sitios de unión de tres pequeños ligandos en FKBP12.
  • Métodos computacionales empleados para predecir independientemente los sitios de unión de ligando en FKBP12.
  • Comparó datos experimentales de RMN con predicciones computacionales para el posicionamiento del ligando.

Principales resultados:

  • Tanto la espectroscopia de RMN como los métodos computacionales identificaron con éxito los sitios de unión para los ligandos probados en FKBP12.
  • Las predicciones computacionales identificaron con precisión y clasificaron favorablemente las posiciones de los ligandos que satisfacían las restricciones experimentales del Efecto Nuclear Overhauser (NOE).
  • El estudio demostró la concordancia entre los enfoques experimentales y computacionales para la identificación del sitio del ligando.

Conclusiones:

  • Los métodos computacionales son herramientas efectivas para predecir los sitios de unión de ligandos, complementando los datos experimentales de RMN.
  • La integración de técnicas computacionales y experimentales puede acelerar el descubrimiento de fármacos mediante el mapeo preciso de las interacciones de los ligandos.
  • Los enfoques computacionales validados proporcionan información confiable sobre las interacciones ligando-macromolécula para la identificación del objetivo.