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Related Concept Videos

Transcription in Prokaryotes01:28

Transcription in Prokaryotes

Transcription is a highly regulated process that converts genetic information into RNA molecules. The transcription cycle is divided into three key stages: initiation, elongation, and termination, each driven by specific molecular mechanisms.Initiation of TranscriptionIn bacteria, transcription begins when the RNA polymerase core enzyme associates with a sigma factor to form a holoenzyme. For example, the E. coli sigma factor called σ70 forms a holoenzyme, which recognizes the -10 (Pribnow box)...
Translation in Prokaryotes01:29

Translation in Prokaryotes

Prokaryote translation is a complex, highly coordinated process that converts genetic information from mRNA into functional proteins. It involves three stages: initiation, elongation, and termination, each facilitated by specific molecular components.Initiation of TranslationThe process begins with the assembly of the ribosomal subunits and initiation factors on the mRNA. In bacteria, the 30S ribosomal subunit recognizes the Shine-Dalgarno sequence in the mRNA, a conserved region upstream of...
Translational Regulation01:29

Translational Regulation

Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
Prokaryotic Gene Structure and Organization01:28

Prokaryotic Gene Structure and Organization

Prokaryotic genomes exhibit a streamlined organization of coding and non-coding regions essential for gene expression and protein synthesis. While coding regions contain the genetic instructions for proteins or functional RNAs, non-coding regions regulate the precise transcription and translation of these genes.Coding Regions: Proteins and RNAsThe primary coding regions, known as structural genes, include sequences transcribed into messenger RNA (mRNA) and ultimately translated into...
Initiation of Translation02:33

Initiation of Translation

Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
Leaky Scanning02:28

Leaky Scanning

During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...

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Translational recoding in archaea.

Beatrice Cobucci-Ponzano1, Mosè Rossi, Marco Moracci

  • 1Institute of Protein Biochemistry, Consiglio Nazionale delle Ricerche, Via P. Castellino 111, 80131, Naples, Italy.

Extremophiles : Life Under Extreme Conditions
|September 28, 2012
PubMed
Summary
This summary is machine-generated.

Translational recoding, including frameshifting, regulates protein expression across life. This review focuses on archaea, exploring its role in extreme environments and the origin of life.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Translational recoding encompasses events like stop codon readthrough and frameshifting, modifying protein expression.
  • These mechanisms challenge the traditional DNA→RNA→protein central dogma by allowing non-co-linear information flow.
  • In Archaea, recoding regulates selenocysteine and pyrrolysine incorporation, but programmed -1 frameshifting is rare.

Purpose of the Study:

  • To review the current understanding of translational recoding in Archaea.
  • To highlight the implications of recoding for extremophiles and the origins of life.

Main Methods:

  • Literature review and synthesis of existing research on translational recoding in Archaea.

Main Results:

  • Only one instance of programmed -1 frameshifting has been documented in Archaea.
  • Further potential cases of frameshifting in Archaea require additional confirmation.

Conclusions:

  • Translational recoding plays a significant role in Archaea, impacting their unique physiology.
  • Understanding recoding in Archaea offers insights into life's origins and adaptation to extreme environments.