Borate Transporters and SLC4 Bicarbonate Transporters Share Key Functional Properties
Borate transporters are membrane transport proteins that regulate intracellular borate levels. In plants, borate is a micronutrient essential for growth but is toxic in excess, while in yeast, borate is unnecessary for growth and borate export confers tolerance. Borate transporters share structural...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/13/2/235 |
| _version_ | 1827756516848959488 |
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| author | Jean L. Beltran Lila G. McGrath Sophia Caruso Richara K. Bain Claire E. Hendrix Hana Kamran Hartlee G. Johnston Rebecca M. Collings Menkara-Chinua N. Henry Tsega-Ab L. Abera Valeria A. Donoso Erin C. Carriker Bryan H. Thurtle-Schmidt |
| author_facet | Jean L. Beltran Lila G. McGrath Sophia Caruso Richara K. Bain Claire E. Hendrix Hana Kamran Hartlee G. Johnston Rebecca M. Collings Menkara-Chinua N. Henry Tsega-Ab L. Abera Valeria A. Donoso Erin C. Carriker Bryan H. Thurtle-Schmidt |
| author_sort | Jean L. Beltran |
| collection | DOAJ |
| description | Borate transporters are membrane transport proteins that regulate intracellular borate levels. In plants, borate is a micronutrient essential for growth but is toxic in excess, while in yeast, borate is unnecessary for growth and borate export confers tolerance. Borate transporters share structural homology with human bicarbonate transporters in the SLC4 family despite low sequence identity and differences in transported solutes. Here, we characterize the <i>S. cerevisiae</i> borate transporter Bor1p and examine whether key biochemical features of SLC4 transporters extend to borate transporters. We show that borate transporters and SLC4 transporters share multiple properties, including lipid-promoted dimerization, sensitivity to stilbene disulfonate-derived inhibitors, and a requirement for an acidic residue at the solute binding site. We also identify several amino acids critical for Bor1p function and show that disease-causing mutations in human SLC4A1 will eliminate in vivo function when their homologous mutations are introduced in Bor1p. Our data help elucidate mechanistic features of Bor1p and reveal significant functional properties shared between borate transporters and SLC4 transporters. |
| first_indexed | 2024-03-11T08:26:27Z |
| format | Article |
| id | doaj.art-9a4532c27f724cf5aadd6192b2ee41ef |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-11T08:26:27Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-9a4532c27f724cf5aadd6192b2ee41ef2023-11-16T22:03:10ZengMDPI AGMembranes2077-03752023-02-0113223510.3390/membranes13020235Borate Transporters and SLC4 Bicarbonate Transporters Share Key Functional PropertiesJean L. Beltran0Lila G. McGrath1Sophia Caruso2Richara K. Bain3Claire E. Hendrix4Hana Kamran5Hartlee G. Johnston6Rebecca M. Collings7Menkara-Chinua N. Henry8Tsega-Ab L. Abera9Valeria A. Donoso10Erin C. Carriker11Bryan H. Thurtle-Schmidt12Department of Biology, Davidson College, Davidson, NC 28035, USADepartment of Biology, Davidson College, Davidson, NC 28035, USADepartment of Biology, Davidson College, Davidson, NC 28035, USADepartment of Biology, Davidson College, Davidson, NC 28035, USADepartment of Biology, Davidson College, Davidson, NC 28035, USADepartment of Biology, Davidson College, Davidson, NC 28035, USADepartment of Biology, Davidson College, Davidson, NC 28035, USADepartment of Biology, Davidson College, Davidson, NC 28035, USADepartment of Biology, Davidson College, Davidson, NC 28035, USADepartment of Biology, Davidson College, Davidson, NC 28035, USADepartment of Biology, Davidson College, Davidson, NC 28035, USADepartment of Biology, Davidson College, Davidson, NC 28035, USADepartment of Biology, Davidson College, Davidson, NC 28035, USABorate transporters are membrane transport proteins that regulate intracellular borate levels. In plants, borate is a micronutrient essential for growth but is toxic in excess, while in yeast, borate is unnecessary for growth and borate export confers tolerance. Borate transporters share structural homology with human bicarbonate transporters in the SLC4 family despite low sequence identity and differences in transported solutes. Here, we characterize the <i>S. cerevisiae</i> borate transporter Bor1p and examine whether key biochemical features of SLC4 transporters extend to borate transporters. We show that borate transporters and SLC4 transporters share multiple properties, including lipid-promoted dimerization, sensitivity to stilbene disulfonate-derived inhibitors, and a requirement for an acidic residue at the solute binding site. We also identify several amino acids critical for Bor1p function and show that disease-causing mutations in human SLC4A1 will eliminate in vivo function when their homologous mutations are introduced in Bor1p. Our data help elucidate mechanistic features of Bor1p and reveal significant functional properties shared between borate transporters and SLC4 transporters.https://www.mdpi.com/2077-0375/13/2/235membrane transportersprotein–lipid interactionsBor1SLC4A1yeast |
| spellingShingle | Jean L. Beltran Lila G. McGrath Sophia Caruso Richara K. Bain Claire E. Hendrix Hana Kamran Hartlee G. Johnston Rebecca M. Collings Menkara-Chinua N. Henry Tsega-Ab L. Abera Valeria A. Donoso Erin C. Carriker Bryan H. Thurtle-Schmidt Borate Transporters and SLC4 Bicarbonate Transporters Share Key Functional Properties Membranes membrane transporters protein–lipid interactions Bor1 SLC4A1 yeast |
| title | Borate Transporters and SLC4 Bicarbonate Transporters Share Key Functional Properties |
| title_full | Borate Transporters and SLC4 Bicarbonate Transporters Share Key Functional Properties |
| title_fullStr | Borate Transporters and SLC4 Bicarbonate Transporters Share Key Functional Properties |
| title_full_unstemmed | Borate Transporters and SLC4 Bicarbonate Transporters Share Key Functional Properties |
| title_short | Borate Transporters and SLC4 Bicarbonate Transporters Share Key Functional Properties |
| title_sort | borate transporters and slc4 bicarbonate transporters share key functional properties |
| topic | membrane transporters protein–lipid interactions Bor1 SLC4A1 yeast |
| url | https://www.mdpi.com/2077-0375/13/2/235 |
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