National Institutes of Health/Eunice Kennedy Shriver National Institute of Child Health & Human Development (NIH/NICHD)
ZIA HD008998
米国
National Institutes of Health/Eunice Kennedy Shriver National Institute of Child Health & Human Development (NIH/NICHD)
ZIA HD008855
米国
National Institutes of Health/Eunice Kennedy Shriver National Institute of Child Health & Human Development (NIH/NICHD)
ZIA HD008955
米国
National Institutes of Health/National Library of Medicine (NIH/NLM)
LM594244
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
1FI2GM146628-01
米国
German Research Foundation (DFG)
3542/1-1
ドイツ
引用
ジャーナル: Nat Struct Mol Biol / 年: 2025 タイトル: P-type ATPase magnesium transporter MgtA acts as a dimer. 著者: Rilee Zeinert / Fei Zhou / Pedro Franco / Jonathan Zöller / Zaid K Madni / Henry Lessen / L Aravind / Julian D Langer / Alexander J Sodt / Gisela Storz / Doreen Matthies / 要旨: Magnesium (Mg) uptake systems are present in all domains of life, consistent with the vital role of this ion. P-type ATPase Mg importers are required for bacterial growth when Mg is limiting or ...Magnesium (Mg) uptake systems are present in all domains of life, consistent with the vital role of this ion. P-type ATPase Mg importers are required for bacterial growth when Mg is limiting or during pathogenesis. However, insights into their mechanisms of action are missing. Here we solved the cryo-EM structure of the Mg transporter MgtA from Escherichia coli. We obtained high-resolution structures of both homodimeric (2.9 Å) and monomeric (3.6 Å) forms. The dimer structure is formed by multiple contacts between residues in adjacent soluble N and P subdomains. Our structures revealed an ion, assigned as Mg, in the transmembrane segment. Moreover, we detected two cytoplasmic ion-binding sites and determined the structure of the N-terminal tail. Sequence conservation, mutagenesis and ATPase assays indicate dimerization, the ion-binding sites and the N-terminal tail facilitate cation transport or serve regulatory roles.
フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 撮影したグリッド数: 2 / 実像数: 17152 / 平均露光時間: 4.31 sec. / 平均電子線量: 60.0 e/Å2 詳細: A first dataset was collected with a dose rate of 9.5 A/px/s (~7.5 on the camera through the sample), exposure time 0.0712 s/frame (~1 e-/A2) and total exposure time of 4.31 s per movie (~60 ...詳細: A first dataset was collected with a dose rate of 9.5 A/px/s (~7.5 on the camera through the sample), exposure time 0.0712 s/frame (~1 e-/A2) and total exposure time of 4.31 s per movie (~60 e-/A2), resulting in a total of 10,246 movies with 60 frames each. A second dataset was collected with a dose rate of 10 A/px/s (~7.5 on the camera through the sample), exposure time 0.0668 s/frame (~1 e-/A2) and total exposure time of 3.46 s per movie (~50 e-/A2), resulting in a total of 6906 movies with 50 frames each.
選択した数: 3353940 詳細: 1,578,214 particles were initially selected from dataset 1 (10,164 selected movies from 10,246 total). 1,775,726 particles were initially selected from dataset 2 (5,778 selected movies from 6,906 total).