Adenosine utilization in cordycepin-sensitive mutants of Saccharomyces cerevisiae.
A purine-requiring, wild-type yeast strain was cordycepin resistant and failed to grow in medium containing adenosine; in contrast, a cordycepin-sensitive mutant (also purine requiring) grew well in medium containing adenosine. The cordycepin-sensitive mutant incorporated [8-14C]adenosine at nine times the wild-type rate, and adenosine completely fulfilled the purine requirement of the cells. Exogenous adenosine rapidly entered the mutant cells, apparently as free nucleoside, and was phosphorylated; uptake displayed concentration-dependent saturation kinetics (Km, 6 mM). Within 10 min 14C radioactivity was being incorporated into nucleic acids.
D000225:Adenine / Q000378:metabolism; D000241:Adenosine / Q000378:metabolism*; D001693:Biological Transport, Active; D003839:Deoxyadenosines / Q000494:pharmacology*; D009154:Mutation; D012441:Saccharomyces cerevisiae / Q000187:drug effects / Q000378:metabolism*; D014498:Uracil / Q000378:metabolism
D003839:Deoxyadenosines; D014498:Uracil; D000225:Adenine; D000241:Adenosine