GLUT1 is a highly efficient L-fucose transporter.

GLUT1 is a highly efficient L-fucose transporter.
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DOI:
10.1016/j.jbc.2022.102738
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发表时间:
2023-01
影响因子:
4.8
通讯作者:
Freeze, Hudson H.
Freeze, Hudson H.
中科院分区:
生物学2区
文献类型:
--
作者:
Ng, Bobby G.;Sosicka, Paulina;Xia, Zhijie;Freeze, Hudson H.

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Understanding L-fucose metabolism is important because it is used as a therapy for several congenital disorders of glycosylation. Exogenous L-fucose can be activated and incorporated directly into multiple N- and O-glycans via the fucose salvage/recycling pathway. However, unlike for other monosaccharides, no mammalian L-fucose transporter has been identified. Here, we functionally screened nearly 140 annotated transporters and identified GLUT1 (SLC2A1) as an L-fucose transporter. We confirmed this assignment using multiple approaches to alter GLUT1 function, including chemical inhibition, siRNA knockdown, and gene KO. Collectively, all methods demonstrate that GLUT1 contributes significantly to L-fucose uptake and its utilization at low micromolar levels. Surprisingly, millimolar levels of D-glucose do not compete with L-fucose uptake. We also show macropinocytosis, but not other endocytic pathways, can contribute to L-fucose uptake and utilization. In conclusion, we determined that GLUT1 functions as the previously missing transporter component in mammalian L-fucose metabolism.
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