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Related Experiment Videos

HU-GFP and DAPI co-localize on the Escherichia coli nucleoid.

M Wery1, C L Woldringh, J Rouviere-Yaniv

  • 1Laboratoire de Physiologie bactérienne, CNRS UPR 9073, Institut de Biologie Physico-Chimique, 13, rue Pierre-et-Marie-Curie, 75005, Paris, France.

Biochimie
|March 30, 2001
PubMed
Summary

The bacterial HU protein, crucial for DNA maintenance, acts as a DNA tracer. HU-GFP fusion proteins colocalize with DNA in Escherichia coli, revealing its location within living cells.

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Massive parallel analysis of the binding specificity of histone-like protein HU to single- and double-stranded DNA with generic oligodeoxyribonucleotide microchips.

Nucleic acids research·2001

Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • The HU protein is a highly abundant, pleiotropic DNA-binding protein in bacteria.
  • HU influences DNA superhelical density and shares characteristics with histones and HMG proteins.
  • Emerging evidence suggests HU acts as a DNA damage sensor due to its binding to recombination and repair intermediates.

Purpose of the Study:

  • To investigate the intracellular localization of the HU protein in living bacterial cells.
  • To determine if HU can serve as a marker for DNA within the bacterial nucleoid.

Main Methods:

  • Construction of HU-GFP fusion proteins in Escherichia coli.
  • Microscopic imaging comparing GFP fluorescence with DAPI-stained nucleoids.
  • Colocalization analysis of HU-GFP and DAPI signals.

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Main Results:

  • HU-GFP fusion proteins were successfully constructed and expressed in E. coli.
  • Microscopy revealed that GFP fluorescence from HU-GFP colocalizes with the DAPI-stained nucleoid.
  • This colocalization indicates that HU is found wherever DNA is located within the cell.

Conclusions:

  • HU protein is distributed throughout the bacterial nucleoid.
  • HU can be considered a natural tracer for DNA in living bacterial cells.
  • This finding aids in understanding bacterial DNA organization and dynamics.