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Structure analysis of the global metabolic regulator Crc from Pseudomonas aeruginosa

Yong Wei1, Heng Zhang, Zeng-Qiang Gao

  • 1School of Life Sciences, University of Science and Technology of China, Hefei, People's Republic of China.

IUBMB Life
|January 3, 2013
PubMed

Insights

The crystal structure of Pseudomonas aeruginosa catabolite repression control (Crc) was determined. This reveals its potential as a novel antimicrobial target by understanding its RNA-binding properties.

Area of Science:

  • Microbiology
  • Structural Biology
  • Biochemistry

Background:

  • Catabolite repression control (Crc) regulates antibiotic susceptibility and virulence in Pseudomonas aeruginosa.
  • Crc functions with CrcZ small RNA in a post-transcriptional regulatory system.
  • Crc is a potential nonlethal target for novel antimicrobial development.

Purpose of the Study:

  • To determine the crystal structure of Crc from Pseudomonas aeruginosa.
  • To elucidate the structural basis for Crc's function and substrate specificity.
  • To provide a foundation for developing Crc-targeted antimicrobials.

Main Methods:

  • X-ray crystallography (2.20 Å resolution)
  • Circular dichroism spectroscopy
  • Structural analysis and homology comparison

Main Results:

  • The crystal structure of P. aeruginosa Crc was determined, revealing a four-layered α/β-sandwich structure.
  • Circular dichroism confirmed Crc's thermostability in solution.
  • Structural comparisons suggest Crc is an exodeoxyribonuclease III family member with a preference for RNA substrates, featuring five flexible loops for RNA recognition.

Conclusions:

  • The determined crystal structure provides critical insights into Crc's molecular architecture.
  • Crc exhibits distinct RNA substrate specificity compared to DNA endonucleases.
  • This structural information supports the future development of Crc as a target for novel antibiotics against P. aeruginosa.

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