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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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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Rapid Isolation of the Mitoribosome from HEK Cells
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Evolution: Mitochondrial Ribosomes Across Species.

Rajendra K Agrawal1,2, Soneya Majumdar3

  • 1Division of Translational Medicine, Wadsworth Center, New York State Department of Health Empire State Plaza, Albany, NY, USA. rajendra.agrawal@health.ny.gov.

Methods in Molecular Biology (Clifton, N.J.)
|May 11, 2023
PubMed
Summary
This summary is machine-generated.

Mitochondrial ribosomes (mitoribosomes) show significant structural diversity across eukaryotes, reflecting their evolutionary journey from an endosymbiotic ancestor. These complex molecular machines are crucial for protein synthesis within mitochondria.

Keywords:
Cryo-EM structuresEvolutionMRPsMitochondrial rRNAsMitochondrial ribosomes

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Area of Science:

  • Cell Biology
  • Evolutionary Biology
  • Structural Biology

Background:

  • Ribosomes are essential for protein biosynthesis in all cells, including within eukaryotic organelles like mitochondria.
  • Mitochondria originated from an endosymbiotic event involving an alpha-proteobacterium and an early eukaryotic cell.
  • Understanding mitochondrial ribosome (mitoribosome) evolution provides insights into early eukaryotic evolution.

Purpose of the Study:

  • To provide an overview of existing mitoribosomal structures.
  • To analyze the diversification of mitoribosomes within the context of the eukaryotic evolutionary tree.
  • To highlight novel insights into mitoribosome evolution and function.

Main Methods:

  • High-resolution cryo-electron microscopy (cryo-EM) structure determination.
  • Comparative structural analysis of mitoribosomes from various species.
  • Phylogenetic analysis within the eukaryotic evolutionary tree.

Main Results:

  • Recent cryo-EM studies have revealed significant architectural diversity among mitoribosomes.
  • These structural variations offer insights into the evolutionary trajectory of mitoribosomes.
  • Diversification patterns are observed from the last common ancestor of mitoribosomes.

Conclusions:

  • Mitoribosomal structures exhibit remarkable diversity, reflecting their evolutionary history.
  • Structural data aids in understanding the adaptation and diversification of mitochondria.
  • The study provides a framework for further research into mitoribosome evolution and function.