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. 1979 Dec;140(3):971–979. doi: 10.1128/jb.140.3.971-979.1979

Allantoate transport in Saccharomyces cerevisiae.

V Turoscy, T G Cooper
PMCID: PMC216741  PMID: 42640

Abstract

Allantoate uptake appears to be mediated by an energy-dependent active transport system with an apparent Michaelis constant of about 50 microM. Cells were able to accumulate allantoate to greater than 3,000 times the extracellular concentration. The rate of accumulation was maximum at pH 5.7 to 5.8. The energy source for allantoate uptake is probably different from that for uptake of the other allantoin pathway intermediates. The latter systems are inhibited by arsenate, fluoride, dinitrophenol, and carboxyl cyanide-m-chlorophenyl hydrazone, whereas allantoate accumulation was sensitive to only dinitrophenol and carboxyl cyanide-m-chlorophenyl hydrazone. Efflux of preloaded allanotate did not occur at detectable levels. However, exchange of intra- and extracellular allantoate was found to occur very slowly. The latter two characteristics are shared with the allantoin uptake system and may result from the sequestering of intracellular allantoate within the cell vacuole. During the course of these studies, we found that, contrary to earlier reports, the reaction catalyzed by allantoinase is freely reversible.

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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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