Actin in Pumpkin Phloem Exudate

Actin in Pumpkin Phloem Exudate When analyzing cytoskeletal proteins in Cucurbita pepo phloem exudate by immunoblotting, we detected actin in an amount comparable to that in some plant tissues and a small amount of α-tubulin. Electron-microscopic examination of the exudate permitted us to observe filaments that were capable of interacting with the myosin subfragment S1 from rabbit skeletal muscle and with phalloidin conjugated with colloidal gold. The addition of 0.5 mM phalloidin to the exudate in the medium containing 20 mM dithiothreitol (DTT) resulted in an increased number of filaments. Since high DTT concentrations induce a breakdown of filaments of the phloem protein PP1, it seems likely that the produced filaments were composed of actin. The addition of 50 mM MgCl2 to the exudate resulted in the formation of dense bundles and paracrystals, which resembled those produced by muscle actin under similar conditions. Our results demonstrated that actin in phloem sap was capable of polymerization with filament formation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Actin in Pumpkin Phloem Exudate

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Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2002 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/A:1013708210811
Publisher site
See Article on Publisher Site

Abstract

When analyzing cytoskeletal proteins in Cucurbita pepo phloem exudate by immunoblotting, we detected actin in an amount comparable to that in some plant tissues and a small amount of α-tubulin. Electron-microscopic examination of the exudate permitted us to observe filaments that were capable of interacting with the myosin subfragment S1 from rabbit skeletal muscle and with phalloidin conjugated with colloidal gold. The addition of 0.5 mM phalloidin to the exudate in the medium containing 20 mM dithiothreitol (DTT) resulted in an increased number of filaments. Since high DTT concentrations induce a breakdown of filaments of the phloem protein PP1, it seems likely that the produced filaments were composed of actin. The addition of 50 mM MgCl2 to the exudate resulted in the formation of dense bundles and paracrystals, which resembled those produced by muscle actin under similar conditions. Our results demonstrated that actin in phloem sap was capable of polymerization with filament formation.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 13, 2004

References

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