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Brain Nitric Oxide Synthase is a Haemoprotein

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Journal Biochem J
Specialty Biochemistry
Date 1992 Nov 15
PMID 1280109
Citations 23
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Abstract

Brain nitric oxide (NO) synthase showed pyridine haemochrome spectra typical of ferroprotoporphyrin IX-containing enzymes. The haem content of purified NO synthase was in the range 0.7-0.9 mol/mol of 160 kDa subunit. In the presence of CO, NO, KCN and miconazole, the L-citrulline-forming activity of NO synthase was markedly diminished, demonstrating that enzyme-bound haem is involved in enzymic NO synthesis.

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