Phosphorylation/dephosphorylation of maize mitochondrial proteins with different localization

Phosphorylation/dephosphorylation of maize mitochondrial proteins with different localization Phosphorylation and dephosphorylation of the proteins residing in the outer mitochondrial membrane, mitoplasts and whole mitochondria of maize (Zea mays L.) were investigated in order to reveal the possible participation of these processes in mitochondrial signaling. A mitochondrial protein of around 57 kD was identified by immunocytochemistry as α-subunit of the F1-ATPase complex. In isolated mitochondria of maize, phosphorylation of this protein could be visualized only after treating mitochondria with endotholl, an inhibitor of the PP1a and PP2A protein phosphatases. A phosphorylated protein of 46.6 kD was identified as β-subunit of the F1-ATPase complex. Ca2+ is the most common second messenger participating in mitochondrial signaling. We conclude that the transmission of the Ca2+ signal to the plant mitochondria occurs via proteins of the outer mitochondrial membrane. The systems perceiving this signal could include the protein phosphatases residing in the outer mitochondrial membrane, which preferentially dephosphorylate the proteins in the inner membrane. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Phosphorylation/dephosphorylation of maize mitochondrial proteins with different localization

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Publisher
Springer Journals
Copyright
Copyright © 2011 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Plant Physiology; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1134/S1021443711040194
Publisher site
See Article on Publisher Site

Abstract

Phosphorylation and dephosphorylation of the proteins residing in the outer mitochondrial membrane, mitoplasts and whole mitochondria of maize (Zea mays L.) were investigated in order to reveal the possible participation of these processes in mitochondrial signaling. A mitochondrial protein of around 57 kD was identified by immunocytochemistry as α-subunit of the F1-ATPase complex. In isolated mitochondria of maize, phosphorylation of this protein could be visualized only after treating mitochondria with endotholl, an inhibitor of the PP1a and PP2A protein phosphatases. A phosphorylated protein of 46.6 kD was identified as β-subunit of the F1-ATPase complex. Ca2+ is the most common second messenger participating in mitochondrial signaling. We conclude that the transmission of the Ca2+ signal to the plant mitochondria occurs via proteins of the outer mitochondrial membrane. The systems perceiving this signal could include the protein phosphatases residing in the outer mitochondrial membrane, which preferentially dephosphorylate the proteins in the inner membrane.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Jun 19, 2011

References

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