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* Department of Chemistry and Biochemistry, University of California at Los Angeles, Los Angeles, California 90095-1569; We expressed the human anti-apoptotic protein, Bcl-2, in Saccharomyces cerevisiae to investigate
its effects on antioxidant protection and stationary
phase survival. Yeast lacking copper-zinc superoxide
dismutase (sod1
Program on Aging, The Burnham Institute, La Jolla, California 92037; and § Neuroscience Department, University of California
at San Diego, La Jolla, California 92093
) show a profound defect in entry
into and survival during stationary phase even under
conditions optimal for survival of wild-type strains (incubation in water after stationary phase is reached).
Expression of Bcl-2 in the sod1
strain caused a large
improvement in viability at entry into stationary phase, as well as increased resistance to 100% oxygen and increased catalase activity. In addition, Bcl-2 expression
reduced mutation frequency in both wild-type and
sod1
strains. In another set of experiments, wild-type
yeast incubated in expired minimal medium instead of water lost viability quickly; expression of Bcl-2 significantly delayed this stationary phase death. Our results
demonstrate that Bcl-2 has activities in yeast that are
similar to activities it is known to possess in mammalian
cells: (a) stimulation of antioxidant protection and (b)
delay of processes leading to cell death.
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