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Structure-function aspects in the nitric oxide synthases

D J Stuehr1

  • 1Department of Immunology, Cleveland Clinic, Ohio 44195, USA.

Annual Review of Pharmacology and Toxicology
|January 1, 1997
PubMed
Summary
This summary is machine-generated.

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Nitric oxide synthases (NOSs) are crucial enzymes synthesizing nitric oxide (NO) from L-arginine. This research details NOS structure, prosthetic group binding, and assembly for cellular function.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Physiology

Background:

  • Nitric oxide (NO) acts as a vital signaling and effector molecule in physiological and pathological processes.
  • Enzymatic synthesis of NO in animals occurs via nitric oxide synthases (NOSs), utilizing L-arginine as a substrate.

Purpose of the Study:

  • To summarize the structure-function relationships of the three known NOS isoforms.
  • To elucidate the composition of NOS domains and their roles in prosthetic group binding and catalysis.
  • To present a general model for NOS structure and cellular assembly.

Main Methods:

  • Review and synthesis of existing research on NOS structure and function.
  • Analysis of protein domains, prosthetic group binding sites, and catalytic properties.

Related Experiment Videos

  • Examination of factors influencing NOS assembly within cells.

    • Main Results:

    • NOS isoforms are dimeric, bi-domain enzymes requiring specific prosthetic groups (heme, FAD, FMN, BH4).
    • Detailed understanding of domain composition, prosthetic group binding regions, and catalytic mechanisms.
    • Insights into the relationship between dimeric structure, prosthetic group function, and enzyme assembly.

    Conclusions:

    • The structure and assembly of NOS enzymes are critical for their biological roles in NO synthesis.
    • A comprehensive model for NOS structure and assembly provides a framework for understanding enzyme regulation and function.