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Videos de Conceptos Relacionados

Signal Sequences and Sorting Receptors01:41

Signal Sequences and Sorting Receptors

Signal sequences are short amino acid sequences that guide newly synthesized proteins to their proper location within the cell. Classical signal sequences are fifteen to sixty amino acids long and present at the N-terminus of a polypeptide chain. Each signal sequence has a conserved segment of basic residues towards their N terminus, a hydrophobic core, and a C-terminus rich in polar residues. The C-terminus also contains a signal cleavage site and features a -3 -1 sequence motif. The -3-1...
Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Nucleic Acid Structure01:25

Nucleic Acid Structure

The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA has a double-helix structure. The...
Next-generation Sequencing03:00

Next-generation Sequencing

The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features.
Nucleic Acids02:43

Nucleic Acids

Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and carry instructions for its functioning.
DNA and RNA
The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and in the organelles, chloroplasts, and mitochondria. In prokaryotes, the...
Nucleic acids02:43

Nucleic acids

Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and carry instructions for its functioning.
DNA and RNA
The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and in the organelles, chloroplasts, and mitochondria. In prokaryotes, the...

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Video Experimental Relacionado

Updated: Jun 22, 2026

Self-Assembly of Gamma-Modified Peptide Nucleic Acids into Complex Nanostructures in Organic Solvent Mixtures
08:15

Self-Assembly of Gamma-Modified Peptide Nucleic Acids into Complex Nanostructures in Organic Solvent Mixtures

Published on: June 26, 2020

La secuencia de autoensamblaje de los ácidos nucleicos peptídicos adaptativos.

Yasuyuki Ura1, John M Beierle, Luke J Leman

  • 1Department of Chemistry and Skaggs Institute for Chemical Biology, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Science (New York, N.Y.)
|June 13, 2009
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron ácidos nucleicos peptídicos tioéster (tPNA), un nuevo polímero sintético que se autoensambla y adapta su secuencia en respuesta a las plantillas. Este avance permite presiones de selección libres de enzimas para nuevos biomateriales y construcciones catalíticas.

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Self-Assembly of Gamma-Modified Peptide Nucleic Acids into Complex Nanostructures in Organic Solvent Mixtures
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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

Área de la Ciencia:

  • Biología sintética Biología sintética.
  • La bioquímica es la bioquímica.
  • Química de los polímeros La química de los polímeros es la química de los polímeros.

Sus antecedentes:

  • Los polímeros informacionales sintéticos anteriores carecían de capacidad de respuesta a las presiones de selección sin enzimas.
  • El desarrollo de nuevos análogos de ácido nucleico es crucial para el avance de los biomateriales y sistemas sintéticos.

Objetivo del estudio:

  • Introducir una nueva clase de polímeros sintéticos, los ácidos nucleicos peptídicos tioéster (tPNA), capaces de autoensamblarse y modificar la secuencia dinámica.
  • Demostrar la capacidad de los tPNA para someterse a selección y adaptación en condiciones libres de enzimas.

Principales métodos:

  • Autoensamblaje de los tPNA a través del anclaje covalente reversible de las unidades nucleobásicas en las columnas vertebrales de los oligo-dipeptidos.
  • Demostración de auto-emparejamiento y cruce de emparejamiento específico de tPNA con ARN y ADN a través de las interacciones de Watson-Crick.
  • Investigar la modificación de la secuencia dinámica en respuesta al cambio de moléculas de plantilla en solución.

Principales resultados:

  • Los tPNA se autoensamblan de manera eficiente y exhiben capacidades de modificación dinámica de secuencias.
  • Los tPNA demuestran emparejamiento complementario específico con otros tPNA.
  • Los tPNA muestran apareamiento cruzado con ácidos nucleicos naturales (ARN y ADN) siguiendo las reglas de Watson-Crick para el apareamiento de bases.
  • El sistema funciona eficazmente en condiciones libres de enzimas, lo que permite presiones de selección.

Conclusiones:

  • Los tPNA representan un avance significativo en los polímeros sintéticos informacionales, que combinan el emparejamiento de bases con funcionalidades similares a las de los péptidos.
  • La naturaleza dinámica y adaptativa de los tPNA abre posibilidades para el diseño de nuevas construcciones catalíticas y biomateriales.
  • Las aplicaciones potenciales incluyen sistemas capaces de auto-reparación y adaptación, imitando procesos biológicos.