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Updated: May 14, 2025

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Effect of Mutations on Smlt1473 Binding to Various Substrates Using Molecular Dynamics Simulations

Kinjal Mondal1, Samantha Felton2, Bryan W Berger3

  • 1Institute for Physical Science and Technology, Biophysics Program, University of Maryland, College Park, Maryland 20742, United States.

The Journal of Physical Chemistry. B
|April 11, 2025
PubMed

Insights

This study reveals key amino acid residues in Smlt1473, a polysaccharide lyase, crucial for binding substrates like hyaluronic acid. Mutations in these residues significantly impact enzyme activity, aiding in understanding enzyme function.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Smlt1473 is a polysaccharide lyase from Stenotrophomonas maltophilia.
  • Its crystal structure has been determined using X-ray crystallography.
  • Understanding substrate binding and the impact of mutations is crucial for enzyme engineering.

Purpose of the Study:

  • To investigate the binding of hyaluronic acid (HA) and mannuronic acid (ManA) to Smlt1473 and its mutants (H221F, R312L).
  • To analyze the stability and dynamics of substrate binding using computational methods.
  • To identify key residues involved in substrate recognition and activity.

Main Methods:

  • Molecular docking and molecular dynamics simulations were employed.
  • Machine learning-based clustering algorithms analyzed simulation trajectories.
  • Molecular interactions were calculated, and wet lab mutagenesis studies confirmed residue importance.

Main Results:

  • Residue R218 is critical for substrate binding and activity, particularly in the H221F mutant.
  • Residue R312 (and its mutation to L312) plays a significant role in binding.
  • Residues K56, R107, and R164 were identified as important for substrate binding.

Conclusions:

  • Specific residues, including R218, R312, K56, R107, and R164, are vital for Smlt1473's substrate binding and activity.
  • Computational simulations combined with experimental validation provide insights into enzyme-substrate interactions.
  • This research aids in understanding and potentially engineering polysaccharide lyase function.

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