Purification of the inducible murine macrophage nitric oxide synthase. Identification as a flavoprotein.

The synthesis of nitric oxide (.NO) from L-arginine has been demonstrated in a number of cell types and functions either as a cell signaling agent or as a key component of the cell-mediated immune response. Both constitutive and inducible activities have been described. Herein we report the purification of inducible .NO synthase (EC 1.14.23) from activated murine macrophages using a two-column procedure. Crude 100,000 x g supernatant was passed through a 2'-5'-ADP-Sepharose 4B affinity column followed by a DEAE-Bio-Gel A anion exchange column. The .NO synthase ran as a band of Mr = 130,000 on sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Gel filtration experiments using a Superose 6 HR 10/30 column estimated the native molecular weight to be 260 +/- 30 kDa, indicating that the native enzyme exists as a dimer. Activity was dependent upon L-arginine (Km = 16 +/- 1 microM at 37 degrees C and pH 7.5) and NADPH. Both (6R)-tetrahydro-L-biopterin and FAD enhanced activity, whereas Mg2+ and FMN had no effect on activity. Fluorescence studies demonstrated the presence of one bound FAD and one bound FMN per subunit.

• Publication year

  1991

• Venue

  Journal of Biological Chemistry

• Publication date

  1991-12-05

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1016/s0021-9258(18)54421-5PMID 1720773
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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