Abstract:
:We previously reported that Ca2+/calmodulin-dependent protein kinase II (CaMKII) is inhibited by S-nitrosylation of Cys6 in cells. Herein, we show that polysulfidation of CaMKII at Cys6 limits its enzyme activity following reactive sulfur species (RSS) stimulus. In vitro incubation of CaMKII with the RSS donor, Na2S4, induced the inhibition of the enzyme via its polysulfidation. Treatment with dithiothreitol reversed the polysulfidation and the subsequent inhibition. The inhibition of CaMKII by Na2S4 is competitive with ATP but not with the peptide substrate Syntide-2. In transfected cells expressing CaMKII, the enzyme activity decreased upon treatment with Na2S4, whereas cells expressing mutant CaMKII (C6A) were resistant to this treatment. In addition, the endogenous CaMKII was inhibited by treatment with Na2S4 in RAW264.7 murine macrophage cells. These results suggest a novel regulation of CaMKII by RSS via its Cys6 polysulfidation in cells.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Araki S,Takata T,Tsuchiya Y,Watanabe Ydoi
10.1016/j.bbrc.2018.11.134subject
Has Abstractpub_date
2019-01-08 00:00:00pages
550-555issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(18)32566-Xjournal_volume
508pub_type
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