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- W2059384909 abstract "The TRPM7 (transient receptor potential melastatin 7) ion channel has been implicated in the uptake of Mg2+ into vertebrate cells, as elimination of TRPM7 expression through gene targeting in DT40 B-lymphocytes renders them unable to grow in the absence of supplemental Mg2+. However, a residual capacity of TRPM7-deficient cells to accumulate Mg2+ and proliferate when provided with supplemental Mg2+ suggests the existence of Mg2+ uptake mechanism(s) other than TRPM7. Evaluation of the expression of several members of the SLC41 (solute carrier family 41) family, which exhibit homology with the MgtE class of prokaryotic putative bivalent-cation transporters, demonstrated that one, SLC41A2 (solute carrier family 41 member 2), is expressed in both wild-type and TRPM7-deficient DT40 cells. Characterization of heterologously expressed SLC41A2 protein indicated that it is a plasma-membrane protein with an N-terminus-outside/C-terminus-inside 11-TM (transmembrane)-span topology, consistent with its functioning as a trans-plasma-membrane transporter. In contrast with a previous report of ion-channel activity associated with SLC41A2 expression in oocytes, investigation of whole cell currents in SLC41A2-expressing DT40 cells revealed no novel currents of any type associated with SLC41A2 expression. However, expression of SLC41A2 in TRPM7-deficient cells under the control of a doxycycline-inducible promoter was able to conditionally enhance their net uptake of 26Mg2+ and conditionally and dose-dependently provide them with the capacity to grow in the absence of supplemental Mg2+, observations strongly supporting a model whereby SLC41A2 directly mediates trans-plasma-membrane Mg2+ transport. Overall, our results suggest that SLC41A2 functions as a plasma-membrane Mg2+ transporter in vertebrate cells." @default.
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- W2059384909 date "2006-12-21" @default.
- W2059384909 modified "2023-10-11" @default.
- W2059384909 title "<i>SLC41A2</i> encodes a plasma-membrane Mg2+ transporter" @default.
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- W2059384909 doi "https://doi.org/10.1042/bj20060673" @default.
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