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. 1973 Aug 1;58(2):401–409. doi: 10.1083/jcb.58.2.401

PERIODIC CHANGES IN RATE OF AMINO ACID UPTAKE DURING YEAST CELL CYCLE

B L A Carter 1, H O Halvorson 1
PMCID: PMC2109040  PMID: 4580902

Abstract

Uptake of amino acids is a complex process but in cells growing with ammonia as sole nitrogen source the initial uptake rate of amino acids is a measure of the transport capacity of the uptake system (permease). In synchronous cultures of Saccharomyces cerevisiae amino acids were transported at all stages of the cell cycle. However, for any one amino acid the initial uptake rate was constant for most of the cycle and doubled during a discrete part of the cycle. Thus, for a variety of amino acids the functioning amino acid transport capacity of the membrane doubles once per cycle at a characteristic stage of the cycle. Arginine, valine, and phenylalanine exhibit periodic doubling of uptake rate at different stages of the cell cycle indicating that the transport of these amino acids is mediated by three different systems. Serine, phenylalanine, and leucine exhibit periodic doubling of the uptake rate at the same stage of the cycle. However, it is unlikely that serine and phenylalanine share the same transport system since the uptake of one is not inhibited by the other amino acid. This phenomenon is analogous to the periodic synthesis of soluble enzymes observed in S. cerevisiae.

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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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