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Related Concept Videos

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...
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...
Ribosomal RNA Synthesis02:53

Ribosomal RNA Synthesis

Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
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...
RNA Stability01:53

RNA Stability

Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...

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Related Experiment Videos

Canonical RNA pseudoknot structures.

Gang Ma1, Christian M Reidys

  • 1Center for Combinatorics, Nankai University, Tianjin, PR China.

Journal of Computational Biology : a Journal of Computational Molecular Cell Biology
|December 2, 2008
PubMed
Summary
This summary is machine-generated.

This study enumerates specific RNA pseudoknot structures, finding that biologically relevant ones are surprisingly few. This suggests focusing prediction algorithms on a narrower class of RNA structures.

Related Experiment Videos

Area of Science:

  • Computational Biology
  • Bioinformatics
  • RNA Structure Analysis

Background:

  • RNA pseudoknots are crucial for biological function but are complex to analyze.
  • Previous studies have focused on simpler RNA structures, leaving pseudoknots under-explored.
  • Understanding the diversity of RNA pseudoknots is key to deciphering their roles.

Purpose of the Study:

  • To enumerate and characterize k-noncrossing, sigma-canonical RNA pseudoknot structures with minimum arc-length >= 4.
  • To determine the prevalence of specific RNA pseudoknot configurations.
  • To identify potential targets for RNA structure prediction algorithms.

Main Methods:

  • Exact enumeration of RNA pseudoknot structures using generating functions.
  • Derivation of asymptotic formulas for structure counts.
  • Analysis of T(k, sigma)([4])(n) for k=3 to 9.

Main Results:

  • Exact enumeration results for T(k, sigma)([4])(n) were computed.
  • Asymptotic formulas were derived, e.g., T(3, 3)([4])(n) approximately c(3)n(-5)2.0348(n).
  • The set of biophysically relevant RNA pseudoknot structures was found to be surprisingly small.

Conclusions:

  • The combinatorial analysis reveals a limited repertoire of functionally significant RNA pseudoknots.
  • This finding guides the development of more efficient and accurate RNA structure prediction tools.
  • Suggests a new, smaller class of RNA structures for targeted computational prediction.