Different NO sources, such as SNP (sodium nitroprusside), GSNO
(S-nitrosoglutathione) and CysNO are used to investigate the role of NO in plant signaling pathways.
Since a number of studies showed that nitrite mediates its effects through its conversion to NO, the changes in S-nitrosylation of nitrite-treated rat heart were compared with those induced by the NO donor GSNO
. As shown in Figure 1(a), the analysis of S-nitrosylated proteins revealed that both nitrite and GSNO
increased the degree of S-nitrosylation of a broad range of proteins which precipitate with the membrane fraction.
In vascular smooth muscle cell, S-nitrosoglutathione (GSNO
) exposure revealed that the 20S catalytic core of the 26S proteasome contains 10 cysteines which undergo S-nitrosation, thus resulting in the inhibition of all three catalytic activities of the complex (chymotrypsin-, trypsin-, and caspase-like)  (Figure 2).
is a compound found naturally in the body and it has no known side effects or toxicity.
Another mobile signal that activates SAR is S-nitroso-l-glutathione (GSNO
; Dumer & Klessig, 1999).
After the amperometric responses from blood samples reached steady state, an aliquot of GSNO
calibrator was added to calibrate the sensor response in situ.
The compound, nitrosoglutathione (GSNO
), is deficient in people with the disease.
Forty-eight hours following transfection, cells were untreated or exposed to hydrogen peroxide ([H.sub.2][O.sub.2]) a combination of nitric oxide donors [Sodium nitroprusside (SNP) and a S-nitroso derivative of glotathione (GSNO
)], or with a combination of [[H.sub.2][O.sub.2] and SNP/GSNO for 24 hours.
It has also been reported that S-nitrosoglutathione (GSNO
) treatment, also protective against I/R injury, leads to S-nitrosylation of the a subunit and this results in decreased ATP hydrolytic activity .
A member of class II HDACs, Sirt1, was shown to be sensitive to oxidation, especially S-glutathionylation on the Cys67 residue by S-nitrosoglutathione (GSNO
There is some evidence that HOCbl can discriminate between exogenous *NO donors and the natural endogenous donor, S-nitrosoglutathione, GSNO
, actually prolonging only GSNO-induced, gastric fundus relaxations .