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Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
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Engineering Cell-permeable Protein
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Published on: December 28, 2009

Estabilización conformal de una proteína de unión de ingeniería.

Elisabet Wahlberg1, Torleif Härd

  • 1School of Biotechnology, Royal Institute of Technology (KTH), S-106 91 Stockholm, Sweden.

Journal of the American Chemical Society
|June 8, 2006
PubMed
Resumen

La ingeniería del disulfuro mejoró significativamente la afinidad de las proteínas de unión mediante la estabilización de conformaciones específicas. Esta estabilización mejoró la entalpía de unión y la compensación entalpía-entropía, lo que condujo a un aumento de un orden de magnitud en la afinidad de unión.

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Área de la Ciencia:

  • La ingeniería de proteínas es la ingeniería de proteínas.
  • Química biofísica es la química biofísica.
  • Biología molecular La biología molecular.

Sus antecedentes:

  • El afibody Z(SPA)(-)(1) exhibe una afinidad de unión moderada (K(d) = 1.6 microM) a su compañero de dominio Z.
  • Estudios anteriores sugirieron que la heterogeneidad conformacional, no las limitaciones de la interfaz, subyace a esta afinidad moderada.

Objetivo del estudio:

  • Investigar la base termodinámica para mejorar la afinidad de las proteínas de unión a través de la ingeniería de disulfuro.
  • Para mejorar la afinidad de enlace de la Z(SPA)(-)(1) affibody a su socio de dominio Z.

Principales métodos:

  • La ingeniería de disulfuro se empleó para crear Z(SPA)(-)(1) mutantes dobles estabilizados de cisteína.
  • La afinidad de unión se midió utilizando las constantes de disociación (K(d)).
  • Se realizó un análisis termodinámico de la unión, examinando la entropía conformacional, la entropía de desolución y la entalpía de unión.

Principales resultados:

  • Cinco mutantes estabilizados Z(SPA)(-)(1) mostraron un orden de magnitud de mejora en la afinidad, alcanzando K(d) = 130 nM.
  • El análisis termodinámico reveló un equilibrio entre los cambios de entropía de conformación y desolvación.
  • Una mayor afinidad de unión correlacionada con una entalpía de unión más favorable y una compensación entalpía-entropía.

Conclusiones:

  • La afinidad de unión proteína-proteína se puede mejorar significativamente mediante la estabilización de las conformaciones proteicas específicas a través de la ingeniería disulfuro.
  • La estabilización de las conformaciones permite una mejor exploración de los efectos entálpicos favorables durante la unión.
  • La ingeniería de disulfuro ofrece una estrategia viable para mejorar la afinidad afibody para aplicaciones terapéuticas.