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Related Concept Videos

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 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 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...
Structural Protein Function01:56

Structural Protein Function

Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity.  In bones and teeth, it mineralizes to form...
Structural Protein Function01:56

Structural Protein Function

Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity.  In bones and teeth, it mineralizes to form...

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Related Experiment Video

Updated: Jun 27, 2026

Comparative RNA Structure Analysis of Nascent and Mature Transcripts in Saccharomyces cerevisiae
09:12

Comparative RNA Structure Analysis of Nascent and Mature Transcripts in Saccharomyces cerevisiae

Published on: February 27, 2026

[Progress of studies on Dicer structure and function].

Jie-Jun Peng1, Fei Yan, Hai-Ru Chen

  • 1Plant Protection College, Yunnan Agricultural University, Kunming 650201, China. pengjiejun@yeah.net

Yi Chuan = Hereditas
|December 17, 2008
PubMed
Summary
This summary is machine-generated.

Dicer enzymes produce small RNAs crucial for RNA interference. This review explores Dicer

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Last Updated: Jun 27, 2026

Comparative RNA Structure Analysis of Nascent and Mature Transcripts in Saccharomyces cerevisiae
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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Context:

  • Dicer protein is a key enzyme in RNA interference (RNAi).
  • It produces small interfering RNA (siRNA) and microRNA (miRNA).
  • Dicer's structure, including RNA HELICs, PAZ, RNase, and dsRNA binding domains, dictates small RNA characteristics.

Purpose:

  • To review the structural and functional characteristics of Dicer.
  • To enhance understanding of RNAi mechanisms and evolution.
  • To explore the varying Dicer numbers and functions across organisms.

Summary:

  • Dicer's structure determines the nature of siRNA and miRNA.
  • Organisms exhibit diverse Dicer numbers with overlapping functions.
  • Evolution shows a decrease in Dicer quantity but an increase in functional importance.

Impact:

  • Provides insights into the mechanism and evolution of RNAi pathways.
  • Highlights the critical and multifaceted roles of Dicer.
  • Facilitates further research into Dicer's structure-function relationships.