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J Bacteriol. Sep 1986; 167(3): 981–985.
PMCID: PMC215968

Characteristics of sterol uptake in Saccharomyces cerevisiae.


A Saccharomyces cerevisiae sterol auxotroph, FY3 (alpha hem1 erg7 ura), was used to probe the characteristics of sterol uptake in S. cerevisiae. The steady-state cellular concentration of free sterol at the late exponential phase of growth could be adjusted within a 10-fold range by varying the concentration of exogenously supplied sterol. When cultured on 1 microgram of sterol ml-1, the cells contained a minimal cellular free-cholesterol concentration of 0.85 nmol/mg (dry weight) and were termed sterol depleted. When cultured on 11 micrograms of sterol ml-1 or more, the cells contained a maximal cellular free-cholesterol concentration of 6.8 nmol/mg (dry weight) and were termed free sterol saturated. Cells with free-sterol concentrations below the maximal level were capable of accumulating free sterol from the medium. The capacity of the cells for cholesterol uptake was inversely proportional to the initial intracellular concentration. The uptake of sterol was shown to be a nonactive process that is independent of cellular energy sources or viability. The intracellular transport of sterol for esterification is not sensitive to anti-microtubule agents.

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Selected References

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