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Evolución de una mayor complejidad en una máquina molecular.

Gregory C Finnigan1, Victor Hanson-Smith, Tom H Stevens

  • 1Institute of Molecular Biology, University of Oregon, Eugene, Oregon 97403, USA.

Nature
|January 11, 2012
PubMed
Resumen

La evolución de máquinas moleculares complejas, como la bomba de protones V-ATPase, implicó la duplicación de genes y la pérdida complementaria de interacciones de proteínas, no nuevas funciones. Este estudio revela procesos evolutivos simples que impulsan la complejidad molecular.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología evolutiva Biología evolutiva.
  • Biología Molecular Biología Molecular

Sus antecedentes:

  • Los procesos celulares se basan en máquinas moleculares, ensamblajes complejos de proteínas.
  • Los mecanismos de la evolución de la máquina molecular siguen siendo poco conocidos.
  • La bomba de protones V-ATPase es una máquina molecular eucariota esencial.

Objetivo del estudio:

  • Investigar la trayectoria evolutiva de la complejidad del anillo transmembrana de la bomba de protones V-ATPasa.
  • Determinar cómo un anillo de tres parálogos evolucionó a partir de un antepasado de dos parálogos.
  • Aclarar el papel de la duplicación génica y la pérdida de interfaz en el aumento de la complejidad molecular.

Principales métodos:

  • Resurrección de genes ancestrales para reconstruir antiguas formas de proteínas.
  • Experimentos genéticos manipuladores para probar las hipótesis evolutivas.
  • Análisis de las interfaces de interacción proteína-proteína.

Principales resultados:

  • El anillo de la V-ATPasa fúngica (tres parálogos) evolucionó a partir de un complejo de dos parálogos a través de la duplicación génica.
  • Las copias hijas perdieron interfaces de interacción complementarias, volviéndose especializadas.
  • Las mutaciones ancestrales específicas recapitulaban este proceso de degeneración.

Conclusiones:

  • El aumento de la complejidad de la máquina molecular puede surgir de eventos evolutivos simples como la duplicación de genes y la pérdida de interfaz.
  • La evolución de la complejidad en la V-ATPasa no requirió nuevas funciones.
  • Este mecanismo ofrece información sobre la evolución de otros complejos de proteínas multiparálogos.