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Elucidating nitric oxide synthase domain interactions by molecular dynamics.

Scott A Hollingsworth1,2,3, Jeffrey K Holden1,2,3, Huiying Li1,2,3

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Protein Science : a Publication of the Protein Society
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Summary

This study models the final electron transfer step in nitric oxide synthase (NOS) enzyme function. The molecular dynamics simulation reveals stable interdomain contacts crucial for nitric oxide (NO) biosynthesis.

Keywords:
electron transfermolecular dynamicsnitric oxide synthaseprotein complexredox partners

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Enzymology

Background:

  • Nitric oxide synthase (NOS) is a crucial enzyme for nitric oxide (NO) production.
  • NO biosynthesis involves electron transfer between NOS enzyme domains: reductase (FAD, FMN) and oxygenase (heme).
  • Atomic-level structures of NOS domain interactions, particularly for FMN-to-heme transfer, are lacking.

Purpose of the Study:

  • To model the final FMN-to-heme electron transfer step in the NOS enzyme complex.
  • To predict interdomain contacts essential for stabilizing the NOS output state.
  • To provide a structural basis for understanding NO biosynthesis.

Main Methods:

  • Utilized a 105-nanosecond molecular dynamics (MD) trajectory.
  • Evaluated a model of the heme-FMN-calmodulin NOS complex.
  • Analyzed biophysical data and structural stability.

Main Results:

  • Generated a stable, equilibrated complex structure of the NOS enzyme.
  • Identified specific interdomain contacts critical for the final electron transfer.
  • The model aligns with existing experimental findings.

Conclusions:

  • The study provides a detailed working model for the final electron transfer step in NOS.
  • This model elucidates key interactions required for NO biosynthesis.
  • Further structural insights into NOS function are provided.