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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
Gyroscope01:02

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Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so because...
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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque exerted...

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Method to Measure Tone of Axial and Proximal Muscle
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Published on: December 14, 2011

Las ruedas de péptido son ruedas de péptido.

David T Kaleta1, Martin F Jarrold

  • 1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA.

Journal of the American Chemical Society
|February 14, 2002
PubMed
Resumen

Los multiméricos de péptidos formados por electrospraying adoptan arreglos helicoidales estables. Estas estructuras, incluidos los dímeros y trímeres de péptidos glicina-alanina acetilados con lisina, se estabilizan cooperativamente mediante interacciones electrostáticas.

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Área de la Ciencia:

  • Química biofísica y bioquímica.
  • Química computacional es la química computacional.
  • La biofísica molecular es la biofísica molecular.

Sus antecedentes:

  • El autoensamblaje de péptidos y la multimerización son cruciales en los sistemas biológicos.
  • Comprender las conformaciones de la fase gaseosa de los multiméricos de péptidos proporciona información sobre sus interacciones fundamentales.

Objetivo del estudio:

  • Para investigar las conformaciones de dímeros y trímeres de péptidos no solvados formados por electrospraying.
  • Para dilucidar las fuerzas estabilizadoras que gobiernan estos péptidos multiméricos.

Principales métodos:

  • Electro rociado de péptidos acetilados de glicina-alanina que contienen lisina.
  • Mediciones de movilidad iónica para sondear estructuras en fase gaseosa.
  • Simulaciones de dinámica molecular para modelar y analizar las conformaciones.

Principales resultados:

  • El electrospray produjo señales significativas para dímeros y trímeres de péptidos no solvados.
  • Los recortadores de péptidos adoptan una disposición de hélices en rueda de piñón, estabilizadas por cadenas laterales de lisina y dipolos de hélice.
  • Los dímeros peptídicos forman una estructura helicoidal en forma de V, que también exhiben estabilización electrostática cooperativa.

Conclusiones:

  • El estudio revela disposiciones helicoidales específicas y estables para dímeros y trímeres de péptidos en la fase gaseosa.
  • Las interacciones electrostáticas cooperativas, en particular las que involucran cadenas laterales de lisina y dipolos de hélice, son clave para la estabilidad de múltiples.
  • La movilidad iónica y la dinámica molecular son herramientas efectivas para la caracterización de estructuras de péptidos multimeros.