ArticleFEBS open bio2018
Importance of Val567 on heme environment and substrate recognition of neuronal nitric oxide synthase.
Article in FEBS open bio, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Nitric oxide (NO) produced by mammalian nitric oxide synthases (mNOSs) is an important mediator in a variety of physiological functions. Crystal structures of mNOSs have shown strong conservation of the active-site residue Val567 (numbering for rat neuronal NOS, nNOS). NOS-like proteins have been identified in several bacterial pathogens, and these display striking sequence identity to the oxygenase domain of mNOS (NOSoxy), with the exception of a Val to Ile mutation at the active site. Preliminary studies have highlighted the importance of this Val residue in NO-binding, substrate recognition, and oxidation in mNOSs. To further elucidate the role of this valine in substrate and substrate analogue recognition, we generated five Val567 mutants of the oxygenase domain of the neuronal NOS (nNOSoxy) and used UV-visible and EPR spectroscopy to investigate the effects of these mutations on the heme distal environment, the stability of the heme-Fe
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