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Cholesterol oxidase: ultrahigh-resolution crystal structure and multipolar atom model-based analysis.

Bartosz Zarychta1, Artem Lyubimov2, Maqsood Ahmed1

  • 1Laboratoire de Cristallographie, Résonance Magnétique et Modélisations (CRM2), CNRS, UMR 7036, Institut Jean Barriol, Faculté des Sciences et Technologies, Université de Lorraine, BP 70239, 54506 Vandoeuvre-lès-Nancy CEDEX, France.

Acta Crystallographica. Section D, Biological Crystallography
|April 8, 2015
PubMed
Summary

High-resolution X-ray diffraction reveals subatomic details of cholesterol oxidase, showing electron density in bonds and analyzing protein-cofactor interactions with flavin adenine dinucleotide (FAD). This improves understanding of enzymatic function.

Keywords:
cholesterol oxidase

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Crystallography

Background:

  • Understanding enzymatic function requires detailed protein structure analysis.
  • Subatomic resolution is crucial for elucidating molecular mechanisms.

Purpose of the Study:

  • To examine the subatomic structure of cholesterol oxidase.
  • To analyze the interactions between cholesterol oxidase and its flavin adenine dinucleotide (FAD) cofactor.
  • To investigate the stereochemistry of bonds and hydrogen bonds within the protein structure.

Main Methods:

  • Collected X-ray diffraction data from cholesterol oxidase crystals at 100 K using synchrotron radiation to 0.94 Å resolution.
  • Refined the structure using a spherical atom model and analyzed Fourier residual electron density.
  • Modeled multipolar electron density using the ELMAM2 charge-density database.
  • Averaged maps to observe bond density in the peptide plane.

Main Results:

  • Detected non-modelled bonding peaks in the residual electron density.
  • Observed well-defined bond density in the peptide plane for low-motion residues.
  • Investigated the topology of intermolecular interactions between the protein and FAD.
  • Analyzed the stereochemistry of main-chain bond lengths and hydrogen bonds in relation to secondary structures.

Conclusions:

  • The study provides unprecedented subatomic detail of cholesterol oxidase.
  • The findings enhance the understanding of protein-cofactor interactions and their role in enzymatic function.
  • High-resolution analysis reveals stereochemical details critical for enzyme mechanisms.