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Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure...
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzyme kinetics

Background:

  • Nitric oxide synthase (NOS) produces nitric oxide (NO) via electron transfer.
  • Calmodulin (CaM) regulates NOS activity by binding to a specific domain.
  • Electron transfer in NOS is thought to be conformationally gated.

Purpose of the Study:

  • To investigate the conformational states of NOS during electron transfer.
  • To understand the role of CaM in regulating NOS conformational dynamics.
  • To correlate enzyme conformations with electron transfer efficiency.

Main Methods:

  • Utilized fluorescence-labeled CaM and time-resolved fluorescence detection.
  • Employed Förster Resonance Energy Transfer (FRET) to monitor CaM-heme proximity.
  • Analyzed fluorescence decays from site-directed mutants of NOS and CaM.

Main Results:

  • Identified multiple conformational states of NOS using fluorescence techniques.
  • Demonstrated that FRET efficiency is dependent on the enzyme's conformational state.
  • Mutational analysis assigned specific conformations to interactions between enzyme domains and CaM.

Conclusions:

  • NOS exists in distinct conformational states that gate electron transfer.
  • CaM binding to the oxygenase domain is critical for productive FMN-heme interaction.
  • These findings elucidate the mechanism of conformationally controlled electron transfer in NOS.