期刊
BIOCHEMICAL JOURNAL
卷 376, 期 -, 页码 43-48出版社
PORTLAND PRESS
DOI: 10.1042/BJ20031220
关键词
folate; polarity; thiamine; transport; vitamin
Humans lack biochemical pathways for the synthesis of the micro-nutrients thiamine and folate. Cellular requirements are met through membrane transport activity, which is mediated by proteins of the SLC19A gene family. By using live-cell confocal imaging methods to resolve the localization of all SLC19A family members, we show that the two human thiamine transporters are differentially targeted in polarized cells, establishing a vectorial transport system. Such polarization decreases functional redundancy between transporter isoforms and allows for independent regulation of thiamine import and export pathways in cells.
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