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Visual and Microscopic Evaluation of Streptomyces Developmental Mutants
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Streptomyces IHF uses multiple interfaces to bind DNA.

Tamiza Nanji1, Emma J Gehrke2, Yao Shen3

  • 1Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, ON, Canada.

Biochimica Et Biophysica Acta. General Subjects
|August 4, 2019
PubMed
Summary
This summary is machine-generated.

Streptomyces coelicolor IHF (sIHF) uses multiple DNA-binding surfaces for chromosome condensation, development, and antibiotic production, independent of oligomerization. This reveals novel mechanisms for bacterial nucleoid-associated proteins (NAPs).

Keywords:
DNA binding proteinDNA structureNucleoid-associated proteinsProtein-nucleic acids interactionsSmall-angle X-ray scatteringStreptomyces

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Area of Science:

  • Structural biology
  • Bacterial genetics
  • Molecular mechanisms

Background:

  • Nucleoid-associated proteins (NAPs) are crucial for bacterial chromosome condensation.
  • Oligomeric state of NAPs is vital for DNA condensation.
  • Streptomyces coelicolor IHF (sIHF) is an actinobacterial NAP distinct from E. coli IHF, essential for development and antibiotic production.

Purpose of the Study:

  • To elucidate the DNA-binding and remodeling mechanisms of sIHF.
  • To understand the role of sIHF's structure in its function.
  • To investigate how sIHF contributes to chromosome condensation, development, and antibiotic production.

Main Methods:

  • Crystallography
  • Small-angle X-ray scattering (SAXS)
  • Electron microscopy
  • Structure-guided functional assays

Main Results:

  • sIHF possesses two DNA-binding elements on opposite helix bundle surfaces and an additional DNA-binding surface.
  • All identified DNA-binding elements are essential for in vivo development and antibiotic production.
  • In vitro, these elements collectively restrain negative supercoils, stabilizing DNA binding and remodeling.

Conclusions:

  • Multiple DNA-binding surfaces of sIHF stabilize DNA interaction and remodel DNA, crucial for antibiotic production.
  • A model is proposed where multiple DNA-binding elements facilitate oligomerization-independent nucleoid condensation.
  • This study expands the known mechanisms of bacterial NAPs and demonstrates the utility of integrated structural biology approaches.