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Related Concept Videos

Proteomics01:33

Proteomics

A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...
Nucleoid01:24

Nucleoid

The nucleoid represents a structurally and functionally distinct region within prokaryotic cells, where the cell's DNA and associated proteins are housed. Unlike eukaryotic cells, prokaryotes lack a membrane-bound nucleus, and the nucleoid facilitates the organization and accessibility of the genetic material within this constraint. The DNA in most bacteria and archaea exists as a single, circular, double-stranded molecule that is highly compacted through supercoiling and interactions with...
Genomic DNA in Prokaryotes00:46

Genomic DNA in Prokaryotes

The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
Genomic Diversity in Bacteria
Although bacterial genomes are much...

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Related Experiment Video

Updated: May 23, 2026

A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry
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A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry

Published on: March 13, 2014

A comparative proteomic approach to better define Deinococcus nucleoid specificities.

Magali Toueille1, Boris Mirabella, Philippe Guérin

  • 1Univ. Paris-Sud 11, CNRS UMR 8621, CEA LRC 42V, Institut de Génétique et Microbiologie, Bâtiment 409, Université Paris Sud, F-91405 Orsay Cedex, France.

Journal of Proteomics
|March 27, 2012
PubMed
Summary
This summary is machine-generated.

Radiation-resistant bacteria like Deinococcus have highly compacted nucleoids. The histone-like DNA-binding protein HU and DNA gyrase are key proteins organizing these structures, contributing to radiation resistance.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genomics

Background:

  • Radiation-resistant bacteria, such as Deinococcus species, exhibit highly compacted nucleoids compared to radiation-sensitive bacteria.
  • This nucleoid condensation is hypothesized to limit DNA fragment dispersion, enhancing radiation resistance.
  • Comparative genomics suggests limited homologs of known nucleoid-associated proteins (NAPs) in Deinococcus.

Purpose of the Study:

  • To identify novel proteins involved in nucleoid organization in Deinococcus radiodurans and Deinococcus deserti using a proteomic approach.
  • To investigate the roles of specific proteins, such as HU and DNA gyrase, in Deinococcus nucleoid structure.

Main Methods:

  • Comparative proteomic analysis of nucleoid-enriched fractions from D. radiodurans and D. deserti.
  • Shotgun proteomics for protein identification and semi-quantification.
  • Immunofluorescence microscopy to determine the cellular localization of key proteins.

Main Results:

  • The histone-like DNA-binding protein HU was identified as the most abundant candidate NAP in both species.
  • DNA gyrase subunits were also found to be significant components of the nucleoid.
  • Immunofluorescence confirmed HU and DNA gyrase are localized within the nucleoid, not the cytoplasm.

Conclusions:

  • Deinococcus species possess a limited diversity of NAPs.
  • HU and DNA gyrase are the primary proteins responsible for organizing the Deinococcus nucleoid.
  • These proteins likely contribute to the extreme radiation resistance observed in Deinococcus.