Abstract
A temperature-sensitive mutant of Saccharomyces cerevisiae was identified which at the restrictive temperature of 37 degrees C is unable to secrete a number of cell wall-associated proteins and thus resembles previously reported sec mutants. In contrast to other sec mutants, however, both the temperature-sensitive growth and the secretion defects can be repaired by the addition of D-mannose to growth media. We show that the mutant possesses a single, apparently recessive mutation which leads to the production of a thermolabile phosphomannose isomerase.
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