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MicroPubl Biol ; 20222022.
Artículo en Inglés | MEDLINE | ID: mdl-35903773

RESUMEN

Borate is an essential micronutrient in plants regulated by borate transporters, which also protect both yeast and plants from toxically high levels of borate and share homology with the human SLC4 transporters. SLC4A11 is linked to congenital hereditary endothelial dystrophy and was initially reported to transport borate before subsequent studies rebutted this conclusion. To better understand the transport activities of purported borate transporters, we tested the ability of SLC4A11 and eleven borate transporters from A. thaliana and O. sativa to complement a BOR1 deletion in S. cerevisiae . We show that AtBOR4 , AtBOR5 , AtBOR7 , OsBOR2 , and OsBOR3 can each complement ScBOR1 , while the rest of the transporters tested do not rescue growth. Additionally, quantification of intracellular borate content demonstrates that SLC4A11 does not export borate in yeast, supporting studies that its transported substrate is not borate.

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