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Videos de Conceptos Relacionados

Cross-bridge Cycle01:26

Cross-bridge Cycle

As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
Centroid of a Body01:16

Centroid of a Body

The centroid is an important concept in engineering, physics, and mechanics. It is the geometric center of a body. It always lies within the body except in cases with holes or cavities. When the material that a body is composed of is uniform or homogeneous, the centroid coincides with its center of mass or the center of gravity.
For a homogeneous body with constant density, the centroid can usually be found using equations representing a balance of the moments of the body's volume. If the...
Centroid of a Body: Problem Solving01:03

Centroid of a Body: Problem Solving

The centroid of a body is a crucial concept in engineering and physics. Finding the centroid of a body can help determine its stability, its balance point, and even its design. In this context, consider a thin wire bent in the form of a quarter circular arc. Polar coordinates are used to calculate the centroid. The wire is first divided into small differential elements of a length equal to the radius multiplied by the differential angle.
The x-coordinates and y-coordinates of each element's...
Excitation-Contraction Coupling in Skeletal Muscles01:20

Excitation-Contraction Coupling in Skeletal Muscles

Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
When an action potential...
Muscle Coordination and Action01:24

Muscle Coordination and Action

Muscle coordination is a complex and finely tuned process essential for smooth and purposeful movements like flexion, extension, adduction, abduction, and rotation. The human body orchestrates the actions of various muscles working in concert, each with a specific role. Four functional types describe how muscles work together: agonist, antagonist, synergist, and fixator.
Agonists
Agonist muscles, often called prime movers, are the primary muscles responsible for producing a specific movement.
Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...

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Video Experimental Relacionado

Updated: Jul 6, 2026

Comparative Analysis of Lower Limb Kinematics between the Initial and Terminal Phase of 5km Treadmill Running
08:26

Comparative Analysis of Lower Limb Kinematics between the Initial and Terminal Phase of 5km Treadmill Running

Published on: July 17, 2020

Intermedios cinéticos de trazado durante la unión de ligandos.

Tanja Mittag1, Brian Schaffhausen, Ulrich L Günther

  • 1J. W. Goethe University, Frankfurt, Center for Biomolecular Magnetic Resonance, Institute of Biophysical Chemistry, Biocenter N230, Marie-Curie-Str. 9, 60439 Frankfurt, Germany.

Journal of the American Chemical Society
|July 22, 2004
PubMed
Resumen

La Resonancia Magnética Nuclear (RMN) revela la dinámica de unión de proteínas y ligandos a nivel atómico. El análisis de las formas de las líneas de RMN identifica intermediarios cinéticos específicos, lo que explica la especificidad de la unión.

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Last Updated: Jul 6, 2026

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Estructural Biología estructural.
  • Física Química Física Química es la física de la química.

Sus antecedentes:

  • Las interacciones proteína-ligando son cruciales para los procesos biológicos.
  • La determinación de estructuras estáticas ofrece una visión limitada de los eventos de unión dinámicos.
  • Mientras que los métodos biofísicos proporcionan dinámicas globales, la Resonancia Magnética Nuclear (RMN) ofrece una resolución atómica específica del sitio.

Objetivo del estudio:

  • Desarrollar y aplicar un nuevo método basado en RMN para analizar la cinética de unión proteína-ligando.
  • Para identificar y caracterizar los intermediarios cinéticos transitorios durante el proceso de unión a nivel de aminoácidos.
  • Para dilucidar cómo los estados intermedios inducidos por ligandos influyen en la especificidad de unión.

Principales métodos:

  • Análisis de las formas de las líneas de la Resonancia Magnética Nuclear (RMN).
  • Caracterización de la dinámica específica del sitio a resolución atómica.
  • Identificación de intermediarios cinéticos de larga vida en la vía de reacción proteína-ligando.

Principales resultados:

  • Demostró que el análisis de la forma de la línea de RMN puede identificar intermedios cinéticos individuales a nivel de aminoácidos.
  • Se demostró que diferentes ligandos inducen distintos estados intermedios durante la interacción proteína-ligando.
  • Se estableció una correlación entre las vidas de estos estados intermedios y la especificidad de la unión proteína-ligando.

Conclusiones:

  • El análisis de la forma de la línea de RMN proporciona una poderosa herramienta para visualizar el mecanismo cinético de las interacciones proteína-ligando.
  • Los intermediarios cinéticos inducidos por ligandos juegan un papel crítico en la determinación de la especificidad de la unión.
  • Este enfoque ofrece información directa y específica del sitio sobre los eventos dinámicos que rigen el reconocimiento molecular.