Evidence for the Occurrence of, and Possible Physiological Role for, Cyanobacterial Calmodulin
- 1 May 1984
- journal article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 75 (1) , 222-224
- https://doi.org/10.1104/pp.75.1.222
Abstract
Phosphate uptake by the blue-green alga Oscillatoria limnetica Lemmerman is stimulated by micromolar concentrations of Ca2+. The calmodulin antagonists 4-(3-[2(trifluoromethyl)phenylthiazin-10-yl]propyl)-1-piperazine ethanol-HCl and its monofluoro-analog inhibit orthophosphate uptake of Oscillatoria limnetica by over 97% implying involvement of calmodulin in this process. A calmodulin-like protein was quantitated in cell-free extracts from O. limnetica by radioimmunoassay.Keywords
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