Evidence for rapid uptake of d-galacturonic acid in the yeast Saccharomyces cerevisiae by a channel-type transport system

► Although not metabolized, d-galacturonic acid is rapidly taken up by yeast cells. ► Uptake does not show saturation and strongly increases at lower pH. ► Uptake characteristics are consistent with a channel-type transport system. ► d-Galacturonic acid could be trapped intracellularly in the anionic form. ► The channel-type uptake system is likely encoded by several genes.