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J Bacteriol. 1976 November; 128(2): 689-691

Adenosine utilization in cordycepin-sensitive mutants of Saccharomyces cerevisiae.

ABSTRACT

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.

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