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Evolución dirigida de los mutantes de la sortasa A con perfiles de selectividad de sustrato alterados.

Kirill Piotukh1, Bernhard Geltinger, Nadja Heinrich

  • 1Department of Protein Engineering, Leibniz-Institut für Molekulare Pharmakologie, Robert-Rössle-Strasse 10, 13125 Berlin, Germany.

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Los investigadores diseñaron una enzima sortasa A mutante con una amplia selectividad de sustrato utilizando la evolución dirigida. Este avance permite la semisíntesis de proteínas sin rastro, avanzando la ingeniería de proteínas y las aplicaciones biotecnológicas.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • La ingeniería de proteínas es la ingeniería de proteínas.
  • Biología Molecular Biología Molecular

Sus antecedentes:

  • La Sortasa A (SrtA) es una transpeptidasa bacteriana crucial para la ligadura de proteínas en la ingeniería de proteínas.
  • Los métodos actuales de SrtA requieren el motivo LPxTG, a menudo introduciendo mutaciones no deseadas durante la semisíntesis de proteínas.
  • Existe la necesidad de variantes de la sortasa con especificidad de sustrato alterada para mejorar el ensamblaje de proteínas.

Objetivo del estudio:

  • Para desarrollar una enzima sortasa A mutante con amplia selectividad de sustrato.
  • Para permitir la semisíntesis de proteínas sin rastro superando las limitaciones del motivo LPxTG.
  • Establecer una plataforma para las sortasas de ingeniería con diversas capacidades de ligadura.

Principales métodos:

  • La evolución dirigida se empleó para crear una biblioteca mutante de sortasa A.
  • Se utilizó el cribado de la pantalla de fagos para aislar variantes de la sortasa con bucles de reconocimiento de sustrato alterados.
  • La ingeniería de la sortasa se aplicó para la semisíntesis sin rastro de la histona H3.3.

Principales resultados:

  • Se aisló con éxito una sortasa A mutante con una selectividad de sustrato significativamente ampliada.
  • La ingeniería de la sortasa facilitó la semisíntesis sin rastro de la histona H3, eliminando la necesidad del motivo LPxTG.
  • Esto representa una mutación de ganancia de función que mejora la actividad y versatilidad de la sortasa.

Conclusiones:

  • La evolución dirigida de la sortasa A produce enzimas con una especificidad de sustrato a medida.
  • La semisíntesis de proteínas sin rastro se puede lograr con las sortasas de ingeniería, mejorando la eficiencia de la ingeniería de proteínas.
  • Este trabajo allana el camino para plataformas versátiles de ensamblaje de proteínas que utilizan sortasas de ingeniería en biotecnología.