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Translation in Prokaryotes01:29

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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...
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DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
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The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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Translation in Prokaryotes.

Marina V Rodnina1

  • 1Department of Physical Biochemistry, Max Planck Institute for Biophysical Chemistry, Goettingen 37077, Germany.

Cold Spring Harbor Perspectives in Biology
|April 18, 2018
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Summary
This summary is machine-generated.

This review details prokaryotic translation, covering initiation, elongation, termination, and ribosome recycling. It links ribosome structure and dynamics to function, explaining key mechanistic and structural aspects.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Prokaryotic translation is a fundamental biological process involving the synthesis of proteins from messenger RNA (mRNA).
  • The ribosome, a complex molecular machine, orchestrates translation through distinct phases: initiation, elongation, termination, and recycling.

Purpose of the Study:

  • To provide a comprehensive summary of the current understanding of translation in prokaryotes.
  • To elucidate the mechanistic and structural underpinnings of each translation phase.
  • To highlight the intricate relationship between ribosome structure, dynamics, and function.

Main Methods:

  • Review of existing literature on prokaryotic translation.
  • Analysis of structural and mechanistic data related to ribosome function.
  • Integration of information on initiation complex assembly, decoding, peptide bond formation, translocation, and termination.

Main Results:

  • Initiation involves checkpoints for mRNA and start-site selection.
  • Elongation features codon-anticodon interactions, GTP hydrolysis, and requires elongation factor P (EF-P) for proline-rich sequences.
  • Translation termination releases nascent proteins, followed by ribosome dissociation and recycling.

Conclusions:

  • The ribosome exhibits dynamic conformational fluctuations throughout translation.
  • Understanding tRNA and mRNA movements is crucial for mapping translocation intermediates.
  • Nascent proteins begin folding within the ribosome's polypeptide exit tunnel.