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Chapitre 8
Qu'est-ce que l'expression génétique ?
Gene expression is the process in which DNA directs the synthesis of functional products, such as proteins. Cells can regulate gene expression…
Structure de l'ARN
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…
Stabilité de l'ARN
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural…
ARN polymérase bactérienne et Transcription
During the course of evolution, as organisms transitioned from an RNA genome into a DNA genome, two immediate requirements needed to be fulfilled.…
Types d'ARN
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform…
Transcription
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene…
Facteurs de transcription
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component…
ARN Polymérases dans les eucaryotes
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal and eukaryotic RNAPs sharing significant sequence, structural, and…
Protéines accessoires de l'ARN polymérase II
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by…
Transcription des facteurs d'élongation
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not…
Modification post-transcriptionnelle
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor…
Épissage d'ARN
The process in which eukaryotic RNA is edited prior to protein translation is called splicing. It removes regions that do not code for proteins and…
La structure de la chromatine régule la maturation du pré-ARNm
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into…
Exportation nucléaire d'ARNm
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several…
Synthèse de l'ARN ribosomal
Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal…
Synthèse d'ARN de transfert
One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the…
Le nucléole
The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that…
Structures subnucléaires supplémentaires
The eukaryotic nucleus is a double membrane-bound organelle that contains nearly all of the cell’s genetic material in the form of chromosomes.…
RNA Secondary Structure Prediction Using High-throughput SHAPE
Understanding the function of RNA involved in biological processes requires a thorough knowledge of RNA structure. Toward this end, the methodology…
Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events
Eukaryotic mRNA synthesis is a complex biochemical process requiring transcription of a DNA template into a precursor RNA by the multi-subunit enzyme…
Rapid Synthesis and Screening of Chemically Activated Transcription Factors with GFP-based Reporters
Synthetic biology aims to rationally design and build synthetic circuits with desired quantitative properties, as well as provide tools to…

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