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Structural insights into urocanate reductase using room-temperature X-ray crystallography.

Swati Aggarwal1, Nitisha Gurav2, Esko Oksanen1

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Summary

Urocanate reductase (UrdA) enzyme dynamics were studied using X-ray crystallography. Room-temperature data revealed cryocooling effects on the Arg411 residue, crucial for enzyme function.

Keywords:
active-site anion interactionsroom-temperature crystallographyurocanate reductase

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Urocanate reductase (UrdA) is a bacterial enzyme catalyzing the conversion of urocanic acid to imidazole propionate.
  • The enzyme's active site features a catalytic residue, Arg411, which exhibits significant conformational changes between substrate-bound and product-bound states.
  • Previous studies primarily utilized cryogenic conditions, potentially masking dynamic aspects of the enzyme's active site.

Purpose of the Study:

  • To investigate the conformational dynamics of Urocanate reductase (UrdA) at room temperature.
  • To understand the influence of cryocooling on the enzyme's active site structure, particularly the Arg411 residue.
  • To explore the role of phosphate ions in stabilizing UrdA complexes and influencing Arg411 conformation.

Main Methods:

  • X-ray crystallography was employed to collect data at both room temperature and cryogenic conditions.
  • Analysis of X-ray datasets focused on the occupancy distribution and conformational states of the Arg411 residue.
  • Biochemical assays were used to assess the stabilizing effect of phosphate ions on substrate complexes.

Main Results:

  • Room-temperature X-ray data demonstrated that crystal cryocooling impacts the occupancy distribution of the catalytic Arg411 residue.
  • Phosphate ions were shown to stabilize the substrate complex of UrdA.
  • Phosphate ions can influence and bias the conformation of Arg411.
  • Distinct conformational states of the UrdA active site were observed at room temperature versus cryogenic conditions.

Conclusions:

  • Collecting X-ray data at both room temperature and cryogenic temperatures is essential for a comprehensive understanding of UrdA's dynamic active site.
  • Cryocooling can alter the observed conformational landscape of enzymes, necessitating room-temperature studies.
  • Phosphate ions play a significant role in modulating UrdA's active site conformation and substrate binding.