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. 1969 Nov;100(2):557–564. doi: 10.1128/jb.100.2.557-564.1969

Characterization of the Biotin Transport System in Saccharomyces cerevisiae1

Thomas O Rogers a, Herman C Lichstein a
PMCID: PMC250127  PMID: 5354931

Abstract

The characteristics of the biotin transport mechanism of Saccharomyces cerevisiae were investigated in nonproliferating cells. Microbiological and radioisotope assays were employed to measure biotin uptake. The vitamin existed intracellularly in both free and bound forms. Free biotin was extracted by boiling water. Chromatography of the free extract showed it to consist entirely of d-biotin. Cellular bound biotin was released by treating cells with 6 n H2SO4. The rate of biotin uptake was linear with time for 10 min, reaching a maximum at about 20 min followed by a gradual loss of accumulated free vitamin from the cells. Biotin was not degraded or converted to vitamers during uptake. Transport was temperature- and pH-dependent, optimum conditions for uptake being 30 C and pH 4.0. Glucose markedly stimulated biotin transport. In its presence, large intracellular free-biotin concentration gradients were established. Iodoacetate inhibited the glucose stimulation of biotin uptake. The rate of vitamin transport increased in a linear fashion with increasing cell mass. The transport system was saturated with increasing concentrations of the vitamin. The apparent Km for uptake was 3.23 × 10−7m. Uptake of radioactive biotin was inhibited by unlabeled biotin and a number of analogues including homobiotin, desthiobiotin, oxybiotin, norbiotin, and biotin sulfone. Proline, hydroxyproline, and 7,8-diaminopelargonic acid did not inhibit uptake. Unlabeled biotin and desthiobiotin exchanged with accumulated intracellular 14C-biotin, whereas hydroxyproline did not.

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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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