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Enhancing human spermine synthase activity by engineered mutations.

Zhe Zhang1, Yueli Zheng, Margo Petukh

  • 1Computational Biophysics and Bioinformatics, Department of Physics, Clemson University, Clemson, South Carolina, United States of America.

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This summary is machine-generated.

Engineered spermine synthase (SMS) shows increased activity, unlike disease-causing mutations. This suggests human SMS function is precisely tuned, with deviations leading to Snyder-Robinson syndrome.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Spermine synthase (SMS) catalyzes spermidine to spermine conversion.
  • SMS gene defects cause Snyder-Robinson syndrome, a mild-to-moderate intellectual disability with distinct physical features.
  • Disease-causing mutations destabilize SMS or impair its active site.

Purpose of the Study:

  • To engineer a more catalytically active SMS variant.
  • To investigate the structural and functional basis of SMS efficiency.
  • To understand the evolutionary optimization of human SMS.

Main Methods:

  • Artificial engineering of SMS by interspecies sequence transfer.
  • In vitro experimental validation of the engineered variant's activity.
  • In silico and in vitro analysis of mutation effects on enzyme stability and active site function.

Main Results:

  • An engineered SMS variant with four amino acid substitutions demonstrated higher catalytic activity than wild-type SMS.
  • Enhanced monomer stability, optimized active site electrostatics, and altered mechanical vibrations contributed to increased functionality.
  • Wild-type SMS appears not to be evolutionarily optimized for its reaction.

Conclusions:

  • Enzyme engineering can significantly enhance SMS catalytic efficiency.
  • The precise tuning of wild-type human SMS suggests limited tolerance for functional deviations.
  • SMS dysfunction, even minor, is linked to disease, highlighting the importance of precise enzyme function.