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  • 1Department of Computational Chemistry, Lund University, Chemical Centre, P.O. Box 124, 221 00 Lund, Sweden; European Spallation Source ESS ERIC, P.O. Box 176, 221 00 Lund, Sweden.

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Neutron crystallography reveals precise protonation states and hydrogen bonding in the lysozyme active site. This atomic-level detail resolves long-standing questions about enzyme mechanisms.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Crystallography

Background:

  • Lysozyme is a widely studied enzyme and a standard model system in crystallography.
  • Understanding the active site's protonation and hydrogen bonding is crucial for elucidating enzyme mechanisms.
  • Decades of research have sought to clarify these details, with ongoing debate.

Purpose of the Study:

  • To determine the precise protonation states of the lysozyme active site using neutron diffraction.
  • To visualize the hydrogen-bonding network within the lysozyme active site at atomic resolution.
  • To resolve long-standing mechanistic questions regarding lysozyme function.

Main Methods:

  • Atomic resolution neutron crystallography was employed.
  • High-quality neutron diffraction data were collected for lysozyme crystals.
  • The data were analyzed to determine atomic positions and hydrogen atom locations.

Main Results:

  • Unambiguous determination of protonation states within the lysozyme active site.
  • Detailed visualization of the hydrogen-bonding network surrounding the catalytic residues.
  • Atomic resolution structural data providing unprecedented detail of the active site environment.

Conclusions:

  • The study provides definitive structural evidence clarifying lysozyme's active site chemistry.
  • The findings resolve decades-old mechanistic debates concerning lysozyme function.
  • This work offers a unique atomic-level perspective on protein structure and mechanism.