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. 1972 Oct;112(1):519–526. doi: 10.1128/jb.112.1.519-526.1972

Effect of pH on Adenine and Amino Acid Uptake During Sporulation in Saccharomyces cerevisiae

Dallice Mills a,1
PMCID: PMC251439  PMID: 4562406

Abstract

During the early stages of sporulation in Saccharomyces cerevisiae, the pH of the acetate sporulation medium rises to values of 8.0 or higher. Associated with this rise in pH is a reduced cell permeability to certain precursors of ribonucleic acid (RNA), deoxyribonucleic acid or protein. Uptake of adenine, alanine, and leucine was optimal at pH 5.6 to 6.0, but sporulation was inhibited when the sporulation medium was buffered below pH 7.0. Cellular impermeability can be largely overcome by adjusting the acetate sporulation medium to pH 6.0 for optimal uptake of 14 C-adenine during short pulses without any apparent effect on sporulation. Sporulating cells pulse-labeled 20 min at pH 6.0 incorporated 40 times more 14C-adenine into RNA than sporulating cells pulse-labeled at pH 8.0. This increased incorporation can be attributed to a 100-fold increase in labeled adenosine triphosphate in cells pulse-labeled at pH 6.0 where maximum uptake occurs.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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