Plant Physiol. Drug Metab Dispos
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Plant Physiology 75:534-538 (1984)
© 1984 American Society of Plant Biologists

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Tunicamycin Prevents Cellulose Microfibril Formation in Oocystis solitaria1

Hartmut Quader2

Pflanzenphysiologisches Institut der Universität, Abt. Cytologie, Untere Karspüle 2, D-3400 Göttingen, Federal Republic of Germany

The effect of tunicamycin (TM) on the development of the cell wall in Oocystis solitaria has been investigated. It was found that 10 micromolar TM completely stops the assembly of new microfibrils as observed at the ultrastructural level. During cell wall formation, freeze fracture replicas of the E-face of the plasma membrane reveal two major substructures: the terminal complexes (TC), paired and unpaired, and the microfibril imprints extending from unpaired TCs. In cells treated for 3 hours or longer with TM, the TCs are no longer visible, whereas microfibril imprints are still present. Because of the reported highly selective mode of action of TM, our results implicate a role for lipid-intermediates in cellulose synthesis in O. solitaria. It is assumed that TM prevents the formation of a glycoprotein which probably is a fundamental part of the TCs and may act as a primer for the assembly of the microfibrils.

2 Present address: Zellenlehre, Universität Heidelberg, Im Neuenheimer Feld 230, D-6900 Heidelberg, Federal Republic of Germany.

1 Supported by the Deutsche Forschungsgemeinschaft.




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[Abstract] [Full Text] [PDF]


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Copyright © 1984 by the American Society of Plant Biologists