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Videos de Conceptos Relacionados

RNA Structure01:23

RNA Structure

Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
RNA Interference01:23

RNA Interference

RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
RNA Interference01:23

RNA Interference

RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
siRNA - Small Interfering RNAs02:30

siRNA - Small Interfering RNAs

Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
RNA Structure01:19

RNA Structure

The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
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...

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Nanomanipulation of Single RNA Molecules by Optical Tweezers
06:59

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Published on: August 20, 2014

Los nanocristales de semiconductores con modelo de ARN son nanocristales de semiconductores con modelo de ARN.

Nan Ma1, Chad J Dooley, Shana O Kelley

  • 1Eugene F. Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467, USA.

Journal of the American Chemical Society
|September 28, 2006
PubMed
Resumen
Este resumen es generado por máquina.

El modelado de ARN de transferencia (ARNt) permite la síntesis precisa de nanocristales semiconductores de sulfuro de cadmio (CdS). El control de la estructura del tRNA permite la ingeniería de las propiedades de los nanocristales a nanoescala.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Biotecnología La biotecnología es la biotecnología.
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • Las plantillas biomoleculares ofrecen un control estructural único para la síntesis de nanomateriales.
  • El ARN de transferencia (ARNt) posee una estructura tridimensional definida adecuada como un andamio.
  • Los nanocristales semiconductores como el sulfuro de cadmio (CdS) tienen diversas aplicaciones.

Objetivo del estudio:

  • Investigar el uso del tRNA como plantilla para la síntesis de nanocristales de semiconductores CdS.
  • Explorar cómo la estructura del tRNA influye en las propiedades resultantes del nanocristal.
  • Demostrar el potencial de las biomoléculas en la ingeniería de materiales semiconductores.

Principales métodos:

  • Síntesis acuosa de nanocristales semiconductores CdS utilizando el tRNA como plantilla biomolecular.
  • Utilizando variantes de tRNA plegadas y no estructuradas (a través de mutaciones) para observar los efectos estructurales.
  • Caracterización de las estructuras y propiedades de nanocristales sintetizados.

Principales resultados:

  • Se obtuvo un único producto nanocristalino CdS cuando se utilizó ARNt.t tridimensional plegado.
  • Se observó una gama de productos nanocristalinos de CdS al usar tRNA no estructurado.
  • La estructura y las propiedades de los nanocristales están directamente moduladas por la estructura del ARNt.

Conclusiones:

  • Las biomoléculas, específicamente el tRNA, se pueden emplear sistemáticamente para diseñar estructuras nanocristalinas de semiconductores.
  • El control preciso de las dimensiones y propiedades de los nanocristales se puede lograr a través de la plantillación biomolecular.
  • La sinergia entre las dimensiones de la nanoestructura y la estructura de la biomolécula permite ajustar las propiedades de los materiales a nanoescala.