Molecular cloning and characterization of Ca2+-dependent inducible nitric oxide synthase from guinea-pig lung

We have isolated a full-length cDNA for an inducible nitric oxide synthase (iNOS) from guinea-pig lung. The cDNA has a 3447 bp open reading frame encoding 1149 amino acid residues. The deduced amino acid sequence is approx. 80% identical with iNOS of human epithelial cells and murine macrophages. Co...

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Bibliographic Details
Published in:Biochemical journal 1998-08, Vol.333 ( Pt 3) (3), p.795-799
Main Authors: Shirato, M, Sakamoto, T, Uchida, Y, Nomura, A, Ishii, Y, Iijima, H, Goto, Y, Hasegawa, S
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Animals
Base Sequence
Blotting, Northern
Calcium - metabolism
Cloning, Molecular
COS Cells - enzymology
DNA, Complementary - genetics
DNA, Complementary - metabolism
Guinea Pigs
Humans
Lung - enzymology
Mice
Molecular Sequence Data
Nitric Oxide Synthase - genetics
Nitric Oxide Synthase - metabolism
Nitric Oxide Synthase Type II
Recombinant Proteins - biosynthesis
Sequence Homology, Amino Acid
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Summary:We have isolated a full-length cDNA for an inducible nitric oxide synthase (iNOS) from guinea-pig lung. The cDNA has a 3447 bp open reading frame encoding 1149 amino acid residues. The deduced amino acid sequence is approx. 80% identical with iNOS of human epithelial cells and murine macrophages. Consensus recognition sites for cofactors are highly conserved. COS cell lysate transfected with the guinea-pig iNOS shows significant levels of nitric oxide synthase (NOS) activity, and this is inhibited by 79% by chelation of Ca2+ ions. The NOS activity is restored in a concentration-dependent manner by increasing the free Ca2+ level. The NOS activity is also inhibited by trifluoperazine, a calmodulin antagonist, which suggests that the Ca2+ dependence is due to Ca2+-dependent calmodulin binding to the enzyme. Northern blot analysis reveals that the cloned iNOS mRNA is expressed in the lung and the colon in normal guinea pigs. Stimulation in vivo by lipopolysaccharide induces the expression of iNOS in the kidney, the spleen and the colon, but in the lung the same stimulation decreases its expression. These results suggest that the cloned guinea-pig iNOS is distinct in characteristics and expression from previously described iNOS forms.
ISSN:0264-6021
1470-8728
DOI:10.1042/bj3330795