ATP-dependent modulation of MgtE in Mg(2+) homeostasisTomita, A., Zhang, M., Jin, F., Zhuang, W., Takeda, H., Maruyama, T., Osawa, M., Hashimoto, K.I., Kawasaki, H., Ito, K., Dohmae, N., Ishitani, R., Shimada, I., Yan, Z., Hattori, M., Nureki, O.
(2017) Nat Commun 8: 148-148
- PubMed: 28747715
- DOI: 10.1038/s41467-017-00082-w
- Primary Citation of Related Structures:
- PubMed Abstract:
Magnesium is an essential ion for numerous physiological processes. MgtE is a Mg 2+ selective channel involved in the maintenance of intracellular Mg 2+ homeostasis, whose gating is regulated by intracellular Mg 2+ levels ...
Magnesium is an essential ion for numerous physiological processes. MgtE is a Mg 2+ selective channel involved in the maintenance of intracellular Mg 2+ homeostasis, whose gating is regulated by intracellular Mg 2+ levels. Here, we report that ATP binds to MgtE, regulating its Mg 2+ -dependent gating. Crystal structures of MgtE-ATP complex show that ATP binds to the intracellular CBS domain of MgtE. Functional studies support that ATP binding to MgtE enhances the intracellular domain affinity for Mg 2+ within physiological concentrations of this divalent cation, enabling MgtE to function as an in vivo Mg 2+ sensor. ATP dissociation from MgtE upregulates Mg 2+ influx at both high and low intracellular Mg 2+ concentrations. Using site-directed mutagenesis and structure based-electrophysiological and biochemical analyses, we identify key residues and main structural changes involved in the process. This work provides the molecular basis of ATP-dependent modulation of MgtE in Mg 2+ homeostasis.MgtE is an Mg 2+ transporter involved in Mg 2+ homeostasis. Here, the authors report that ATP regulates the Mg +2 -dependent gating of MgtE and use X-ray crystallography combined with functional studies to propose the molecular mechanisms involved in this process.
Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan. firstname.lastname@example.org.