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Nitric oxide signaling: Classical, less classical, and nonclassical mechanisms

AuthorsMartínez-Ruiz, Antonio ; Cadenas, Susana; Lamas Peláez, Santiago
KeywordsNitric oxide
Posttranslational modifications
Redox regulation
cGMP-dependent kinases
Tyrosine nitration
Cytochrome c oxidase
Signal transduction
Free radicals
Issue Date2011
CitationFree Radical Biology and Medicine 51(1):17-29 (2011)
AbstractAlthough nitric oxide (NO) was identified more than 150 years ago and its effects were clinically tested in the form of nitroglycerine, it was not until the decades of 1970–1990 that it was described as a gaseous signal transducer. Since then, a canonical pathway linked to cyclic GMP (cGMP) as its quintessential effector has been established, but other modes of action have emerged and are now part of the common body of knowledge within the field. Classical (or canonical) signaling involves the selective activation of soluble guanylate cyclase, the generation of cGMP, and the activation of specific kinases (cGMP-dependent protein kinases) by this cyclic nucleotide. Nonclassical signaling alludes to the formation of NO-induced posttranslational modifications (PTMs), especially S-nitrosylation, S-glutathionylation, and tyrosine nitration. These PTMs are governed by specific biochemical mechanisms as well as by enzymatic systems. In addition, a less classical but equally important pathway is related to the interaction between NO and mitochondrial cytochrome c oxidase, which might have important implications for cell respiration and intermediary metabolism. Cross talk trespassing these necessarily artificial conceptual boundaries is progressively being identified and hence an integrated systems biology approach to the comprehension of NO function will probably emerge in the near future.
Publisher version (URL)http://dx.doi.org/10.1016/j.freeradbiomed.2011.04.010
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