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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra. Schrödinger...
Atomic Radii and Effective Nuclear Charge03:08

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Nuclear Stability03:18

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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Los mapas de densidad de resolución atómica revelan diferencias dependientes de la estructura secundaria en la

Paula I Lario1, Alice Vrielink

  • 1Department of Molecular, Cellular and Developmental Biology, Sinsheimer Laboratory, University of California Santa Cruz, Santa Cruz, CA 95064, USA.

Journal of the American Chemical Society
|October 16, 2003
PubMed
Resumen

La cristalografía de rayos X de alta resolución de la colesterol oxidasa revela las distintas propiedades electrónicas de los grupos peptídicos carbonilo en las hélices alfa y las hojas beta. Estos hallazgos ofrecen nuevos conocimientos sobre los efectos electrónicos de las enzimas.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Estructural Biología estructural.
  • Enzimología Enzimología.

Sus antecedentes:

  • Las flavoenzimas juegan un papel crucial en las reacciones redox biológicas.
  • La colesterol oxidasa (SCOA) es una flavoenzima de 55kDa involucrada en el metabolismo del colesterol.
  • Los métodos espectroscópicos sugieren que los grupos carbonilo de péptidos en las hélices alfa exhiben polarización.

Objetivo del estudio:

  • Para determinar la estructura cristalina de rayos X de SCOA a una resolución inferior a la de Angstrom.
  • Investigar las características electrónicas de los grupos carbonilo de péptidos dentro de las hélices alfa y las hojas beta.
  • Para correlacionar las diferencias electrónicas con los parámetros estructurales de las proteínas.

Principales métodos:

  • Determinación de la estructura cristalina de rayos X de SCOA con una resolución de 0,95 Å.
  • Análisis de mapas de densidad de electrones sub-Angstrom.
  • Comparación de la densidad electrónica del grupo carbonilo en hélices alfa y hojas beta.

Principales resultados:

  • Se observó una mayor polarización de la densidad de electrones carbonilo de la cadena principal hacia el oxígeno en las hélices alfa.
  • Se encontró una mayor densidad de carga entre el carbono y el oxígeno en los grupos beta-carbonyl.
  • Las diferencias electrónicas no se correlacionaron con la distancia o planaridad del enlace peptídico.

Conclusiones:

  • Proporciona evidencia experimental de los efectos electrónicos de los dipolos de hélice alfa en las enzimas.
  • Destaca los distintos comportamientos de los grupos electrónicos carbonilo en las diferentes estructuras secundarias.
  • Ofrece nuevos conocimientos estructurales basados en experimentos sobre las propiedades electrónicas de las enzimas.