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Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
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Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Proc+Natl+Acad+Sci+U+S+A 2018 ; 115 (35): E8201-E8210 Nephropedia Template TP
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Structure of the mammalian TRPM7, a magnesium channel required during embryonic development #MMPMID30108148
Duan J; Li Z; Li J; Hulse RE; Santa-Cruz A; Valinsky WC; Abiria SA; Krapivinsky G; Zhang J; Clapham DE
Proc Natl Acad Sci U S A 2018[Aug]; 115 (35): E8201-E8210 PMID30108148show ga
The transient receptor potential ion channel subfamily M, member 7 (TRPM7), is a ubiquitously expressed protein that is required for mouse embryonic development. TRPM7 contains both an ion channel and an alpha-kinase. The channel domain comprises a nonselective cation channel with notable permeability to Mg(2+) and Zn(2+) Here, we report the closed state structures of the mouse TRPM7 channel domain in three different ionic conditions to overall resolutions of 3.3, 3.7, and 4.1 A. The structures reveal key residues for an ion binding site in the selectivity filter, with proposed partially hydrated Mg(2+) ions occupying the center of the conduction pore. In high [Mg(2+)], a prominent external disulfide bond is found in the pore helix, which is essential for ion channel function. Our results provide a structural framework for understanding the TRPM1/3/6/7 subfamily and extend the knowledge base upon which to study the diversity and evolution of TRP channels.