The development of Phytophthora cactorum as a model system for the study of sterol metabolism Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/m039k754v

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  • Phytophthora cactorum lacks sterol synthesis capability. Nevertheless, it exhibits vegetative growth in the total absence of sterol. Supplementation of the growth medium with sterol, however, resulted in a three-fold increase in cell yield. This increase was shown by whole cell and cell free experiments to be the consequence of altered energy transformation. A specific change in efficiency of oxidative phosphorylation was suggested. Uptake of sterols by Phytophthora cactorum is by simple adsorption. The kinetics of adsorption were determined, yielding an apparent Km of 18.0 μM and Vmax of 4.81 x 10⁻⁵ μmoles per minute per mg dry weight. The absence of specificity in initial uptake, esterification, and membrane deposition with respect to sterol structure was demonstrated.
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