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Adachi, T. et al.

Adachi, Weisbrod, Pimentel, Ying, Sharov, Schöneich, Cohen,

S-Glutathiolation by peroxynitrite activates SERCA during arterial relaxation by nitric oxide.

Nitric oxide (NO) physiologically stimulates the sarco/endoplasmic reticulum calcium (Ca(2+)) ATPase ( SERCA) to decrease intracellular Ca(2+) concentration and relax cardiac, skeletal and vascular smooth muscle. Here, we show that NO-derived peroxynitrite (ONOO(-)) directly increases SERCA activity by S-glutathiolation and that this modification of SERCA is blocked by irreversible oxidation of the relevant cysteine thiols during atherosclerosis. Purified SERCA was S-glutathiolated by ONOO(-) and the increase in Ca(2+)-uptake activity of SERCA reconstituted in phospholipid vesicles required the presence of glutathione. Mutation of the SERCA-reactive Cys674 to serine abolished these effects. Because superoxide scavengers decreased S-glutathiolation of SERCA and arterial relaxation by NO, ONOO(-) is implicated as the intracellular mediator. NO-dependent relaxation as well as S-glutathiolation and activation of SERCA were decreased by atherosclerosis and Cys674 was found to be oxidized to sulfonic acid. Thus, irreversible oxidation of key thiol(s) in disease impairs NO-induced relaxation by preventing reversible S-glutathiolation and activation of SERCA by NO/ONOO(-).[1]

References

S-Glutathiolation by peroxynitrite activates SERCA during arterial relaxation by nitric oxide. Adachi, T., Weisbrod, R.M., Pimentel, D.R., Ying, J., Sharov, V.S., Schöneich, C., Cohen, R.A. Nat. Med. (2004) [Pubmed]

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