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RNA Structure

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...

Telomeres and Telomerase

Telomeres and Telomerase

In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.

RNA Structure

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 Structure

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...

Telomeres and Telomerase

Telomeres and Telomerase

In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.

Nucleic Acid Structure

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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Video Experimental Relacionado

Updated: Jul 5, 2026

In vitro Reconstitution of the Active T. castaneum Telomerase

In vitro Reconstitution of the Active T. castaneum Telomerase

Published on: July 14, 2011

Una estructura secundaria conservada para el ARN de la telomerasa.

D P Romero¹, E H Blackburn

¹Department of Microbiology and Immunology, University of California, San Francisco 94143.

|October 18, 1991

Resumen

El ARN de la telomerasa es el ARN telomerasa.

Área de la Ciencia:

Biología Molecular Biología Molecular
Genética La genética.
La bioquímica es la bioquímica.

Sus antecedentes:

La telomerasa es una enzima ribonucleoproteínica esencial para mantener la longitud de los telómeros.
El componente de ARN de la telomerasa sirve como la plantilla para la síntesis del ADN telomérico.
Comprender la estructura del ARN de la telomerasa es crucial para comprender su función.

Objetivo del estudio:

Determinar la estructura secundaria del ARN telomerasa (TER) en varias especies de ciliados.
Identificar los elementos estructurales conservados dentro del TER que son críticos para la síntesis del ADN telomérico.
Para construir un modelo filogenético comparativo de la estructura secundaria TER.

Principales métodos:

Análisis comparativo filogenético de genes TER de siete ciliados tetrahimeninos.

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La clonación y la secuenciación de genes TER de Tetrahymena malaccensis, T. pyriformis, T. hyperangularis, T. pigmentosa, T. hegewishii y Glaucoma chattoni. han sido desarrolladas en el estudio.

Identificación de secuencias complementarias homólogas a través del análisis de covariación de pares de bases putativas.

Principales resultados:

Se identificó una estructura secundaria altamente conservada en todos los ARN de telomerasa analizados, a pesar de la rápida divergencia en las secuencias primarias.
Se encontró un bloque de 22 nucleótidos completamente conservados, que abarca la región de plantilla telomérica.
El análisis de covariación reveló secuencias complementarias homólogas, apoyando el modelo de estructura secundaria propuesto.

Conclusiones:

La estructura secundaria del ARN de la telomerasa se conserva notablemente en diversas especies de ciliados.
La estructura conservada, particularmente la región de plantilla, es vital para la función de la telomerasa en la síntesis del ADN telomérico.
Este estudio proporciona un modelo de estructura secundaria robusto para el ARN de la telomerasa.