Abstract
Schizosaccharomyces pombe showed maximum pyridoxine uptake activity around 10 h after starting cultivation. High concentrations of thiamine and pyridoxine in the medium did not affect the activity or the time but changed intracellular levels of vitamin B6 compounds. Pyridoxine was taken up by a saturable mechanism with two kinds of affinity (K(m) 22.4 microM and 118 microM). The uptake depended on the energy produced anaerobically with an optimum pH of 4.5. The uptake was completely inhibited by amiloride, sodium azide or 2,4-dinitrophenol. The uptake system of the fission yeast was different in various respects from that of a budding yeast.
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