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Archaeal nucleosomes

S L Pereira1, R A Grayling, R Lurz

  • 1Department of Microbiology, The Ohio State University, Columbus, OH 43210, USA.

Proceedings of the National Academy of Sciences of the United States of America
|November 14, 1997
PubMed
Summary
This summary is machine-generated.

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Archaea possess histones that form nucleosome-like structures, compacting DNA similarly to eukaryotes. These archaeal nucleosomes protect DNA and associate with genomic sequences in vivo.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Archaea possess histones with sequence similarities to eukaryal histones.
  • Archaea histones share a conserved histone fold structure.

Purpose of the Study:

  • To investigate the in vivo DNA compaction by archaeal histones.
  • To characterize the structure and DNA association of archaeal nucleosomes.

Main Methods:

  • In vivo formaldehyde cross-linking.
  • Electron microscopy visualization.
  • Immunogold labeling, SDS/PAGE, and immunoblotting.
  • Micrococcal nuclease digestion and DNA protection assays.
  • Immunoprecipitation of DNA-associated histones.

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Main Results:

  • Archaeal histones form tetramers in vivo, similar to eukaryal histone (H3+H4)2 tetramers.
  • Archaeal nucleosomes compact DNA into structures resembling eukaryal nucleosomes.
  • These archaeal nucleosomes protect approximately 60 bp of DNA.
  • Most, but not all, genomic DNA in Methanothermus fervidus is associated with archaeal histones in vivo.

Conclusions:

  • Archaeal histones play a crucial role in DNA compaction, forming nucleosome-like structures.
  • These findings highlight conserved mechanisms of DNA organization across archaea and eukaryotes.
  • Archaeal nucleosomes represent a fundamental unit of genome organization in archaea.