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Matches in SemOpenAlex for { <https://semopenalex.org/work/W1978304885> ?p ?o ?g. }

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• W1978304885 abstract "Although nitric oxide synthase (NOS) is widely considered as the major source of NO in biological cells and tissues, direct evidence demonstrating NO formation from the purified enzyme has been lacking. It was recently reported that NOS does not synthesize NO, but rather generates nitroxyl anion (NO-) that is subsequently converted to NO by superoxide dismutase (SOD). To determine if NOS synthesizes NO, electron paramagnetic resonance (EPR) spectroscopy was applied to directly measure NO formation from purified neuronal NOS. In the presence of the NO trap Fe2+-N-methyl-D-glucamine dithiocarbamate, NO gives rise to characteristic EPR signals with g = 2.04 and aN = 12.7 G, whereas NO- is undetectable. In the presence of L-arginine (L-Arg) and cofactors, NOS generated prominent NO signals. This NO generation did not require SOD, and it was blocked by the specific NOS inhibitor N-nitro-L-arginine methyl ester. Isotope-labeling experiments with L-[15N]Arg further demonstrated that NOS-catalyzed NO arose from the guanidino nitrogen of L-Arg. Measurement of the time course of NO formation demonstrated that it paralleled that of L-citrulline. The conditions used in the prior study were shown to result in potent superoxide generation, and this may explain the failure to measure NO formation in the absence of SOD. These experiments provide unequivocal evidence that NOS does directly synthesize NO from L-Arg." @default.
• W1978304885 created "2016-06-24" @default.
• W1978304885 creator A5034513446 @default.
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• W1978304885 date "1997-11-11" @default.
• W1978304885 modified "2023-10-14" @default.
• W1978304885 title "Direct measurement of nitric oxide generation from nitric oxide synthase" @default.
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• W1978304885 doi "https://doi.org/10.1073/pnas.94.23.12705" @default.
• W1978304885 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/25093" @default.
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