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Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Edición de proteínas mediante una reacción de transposición coordinada

Yi Hua1, Nicholas E S Tay1, Xuanjia Ye1

  • 1Department of Chemistry, Princeton University, Princeton, NJ, USA.

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|April 3, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio introduce la transposición de proteínas, un nuevo método para la ingeniería de proteínas. Permite la sustitución directa de las regiones de proteínas internas en condiciones de plegamiento nativo, ampliando las aplicaciones de semisíntesis de proteínas.

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Área de la Ciencia:

  • La bioquímica
  • Biología molecular
  • Ingeniería de proteínas

Sus antecedentes:

  • La ingeniería de proteínas a través de la ligadura polipeptídica es poderosa, pero requiere un paso final de plegado.
  • Esta limitación restringe los tipos de sistemas susceptibles a la semisíntesis de proteínas.

Objetivo del estudio:

  • Desarrollar un método para sustituir las regiones de proteínas internas en una sola operación.
  • Ampliar el alcance de la semisíntesis de proteínas permitiendo la edición en condiciones de plegamiento de proteínas nativas.

Principales métodos:

  • Desarrolló un sistema de transposición de proteínas utilizando pares ortogonales de inteínas divididas por ingeniería.
  • Análogo a la transposición del ADN, este método media la edición de proteínas.
  • Aplicó la técnica a varios sistemas, incluidos los complejos de proteínas plegadas.

Principales resultados:

  • Sustitución exitosa de regiones internas de proteínas objetivo en un solo paso.
  • Facilitó la introducción eficiente de elementos no codificados en las proteínas.
  • Demostró la aplicabilidad del método a los complejos proteicos plegados.

Conclusiones:

  • La transposición de proteínas ofrece un enfoque versátil para la ingeniería de proteínas.
  • El método supera las limitaciones de las estrategias tradicionales de ligadura.
  • Amplía sustancialmente las posibilidades de semisíntesis y funcionalización de proteínas.