NDLI: Inhibitor analysis of protein phosphorylation/dephosphorylation in maize mitochondria in relation to redox conditions

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Inhibitor analysis of protein phosphorylation/dephosphorylation in maize mitochondria in relation to redox conditions

Content Provider	Springer Nature Link
Author	Subota, I. Yu. Arziev, A. Sh. Senzhenko, L. P. Tarasenko, V. I. Konstantiv, Yu. M.
Copyright Year	2007
Abstract	The role of protein phosphorylation/ dephosphorylation in the redox regulation of mitochondrial functioning was investigated. Incubation of isolated mitochondria of maize (Zea mays L.) in the presence of γ-$^{32}$P-ATP revealed phosphorylation of polypeptides with mol wt of 66, 60, 55, 48/50 doublet, 45, 29, 22, and 19 kD. The presence in the incubation medium of oxidized glutathione significantly reduced the level of protein phosphorylation. The addition of reduced glutathione diminished phosphorylation of proteins with mol wt of 60 and 48/50 kD and slightly increased phosphorylation of proteins with mol wt of 66, 55, and 45 kD. The reducing agent, sodium dithionite decreased phosphorylation of proteins with mol wt of 60, 45, 29, 22, and 19 kD but increased phosphorylation of 55 kD protein. The inhibitors of protein kinases and protein phosphatases significantly modified the effects of redox agents. For example, simultaneous action of an oxidant K$_{3}$[Fe(CN)$_{6}$] and NaF enhanced phosphorylation level compared to separate treatments with these agents. The combined application of sodium dithionite and NaF elevated phosphorylation level of 55 kD protein. Phosphoprotein with mol wt of about 66 kD was identified immunochemically as a heat shock protein (HSP 60). The results indicate the presence in mitochondria of redox-sensitive protein kinases and protein phosphatases. Differential changes in the pattern of mitochondrial phosphoproteins under the action of various redox agents suggest that phosphorylation is probably involved in the transduction of redox signal in plant mitochondria.
Starting Page	343
Ending Page	349
Page Count	7
File Format	PDF
ISSN	10214437
Journal	Russian Journal of Plant Physiology
Volume Number	54
Issue Number	3
e-ISSN	16083407
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2007-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Zea mays mitochondria redox regulation glutathione protein phosphorylation protein kinases Plant Physiology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science

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