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Related Concept Videos

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...
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)...
Termination of Translation01:44

Termination of Translation

The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
Termination of Translation01:44

Termination of Translation

The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
Transcription Attenuation in Prokaryotes02:42

Transcription Attenuation in Prokaryotes

Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
Diversity of Archaea IV01:29

Diversity of Archaea IV

Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist thermal...

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Site Specific Lysine Acetylation of Histones for Nucleosome Reconstitution using Genetic Code Expansion in Escherichia coli
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Translation termination in pyrrolysine-utilizing archaea.

Elena Alkalaeva1, Boris Eliseev, Alexandre Ambrogelly

  • 1Engelhardt Institute of Molecular Biology, the Russian Academy of Sciences, Vavilov str. 32, Moscow 119991, Russia.

FEBS Letters
|October 3, 2009
PubMed
Summary
This summary is machine-generated.

Archaea protein synthesis is unclear. Researchers found only one of two Methanosarcina barkeri release factors recognizes stop codons, suggesting a specialized role for the second factor in pyrrolysine incorporation.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Protein synthesis mechanisms in Archaea are not fully understood.
  • Archaea and eukaryotes share some translation similarities, including single release factors (aRF1 and eRF1) that recognize stop codons.
  • The archaeal genus Methanosarcinaceae utilizes the UAG stop codon for pyrrolysine, the 22nd amino acid.

Purpose of the Study:

  • To investigate the final stage of protein translation in pyrrolysine-utilizing archaea.
  • To analyze the function of the two aRF1 homologs in Methanosarcinaceae.
  • To elucidate the mechanism of pyrrolysine incorporation.

Main Methods:

  • Analysis of archaeal translation termination.
  • Biochemical assays to determine aRF1 homolog activity.
  • Comparative genomics and functional analysis of release factors.

Main Results:

  • Only one of the two Methanosarcina barkeri aRF1 homologs is active and recognizes all three stop codons.
  • The second aRF1 homolog's function remains unknown, suggesting a specialized role.
  • Evidence points to a unique mechanism for pyrrolysine incorporation in Methanosarcinaceae.

Conclusions:

  • The study clarifies the role of aRF1 homologs in Methanosarcinaceae translation.
  • Identifies a specific active release factor and an uncharacterized homolog.
  • Provides insights into the distinct mechanism of pyrrolysine incorporation in archaea.