title: Structural insights on the plant salt-overly-sensitive 1 (SOS1) Na(+)/H(+) antiporter.
abstract: The Arabidopsisthaliana Na(+)/H(+) antiporter salt-overly-sensitive 1 (SOS1) is essential to maintain low intracellular levels of toxic Na(+) under salt stress. Available data show that the plant SOS2 protein kinase and its interacting activator, the SOS3 calcium-binding protein, function together in decoding calcium signals elicited by salt stress and regulating the phosphorylation state and the activity of SOS1. Molecular genetic studies have shown that the activation implies a domain reorganization of the antiporter cytosolic moiety, indicating that there is a clear relationship between function and molecular structure of the antiporter. To provide information on this issue, we have carried out in vivo and in vitro studies on the oligomerization state of SOS1. In addition, we have performed electron microscopy and single-particle reconstruction of negatively stained full-length and active SOS1. Our studies show that the protein is a homodimer that contains a membrane domain similar to that found in other antiporters of the family and an elongated, large, and structured cytosolic domain. Both the transmembrane (TM) and cytosolic moieties contribute to the dimerization of the antiporter. The close contacts between the TM and the cytosolic domains provide a link between regulation and transport activity of the antiporter.
authors.affiliation: BIOPHYM, Departamento de Física Macromolecular, Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Científicas, Serrano 113bis, Madrid E-28006, Spain.
authors.forename: Rafael
authors.initials: R
authors.lastname: Núñez-Ramírez
authors.forename: María José
authors.initials: MJ
authors.lastname: Sánchez-Barrena
authors.forename: Irene
authors.initials: I
authors.lastname: Villalta
authors.forename: Juan F
authors.initials: JF
authors.lastname: Vega
authors.forename: Jose M
authors.initials: JM
authors.lastname: Pardo
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Quintero
authors.forename: Javier
authors.initials: J
authors.lastname: Martinez-Salazar
authors.forename: Armando
authors.initials: A
authors.lastname: Albert
mesh_terms: D017360:Arabidopsis / Q000201:enzymology*; D029681:Arabidopsis Proteins / Q000737:chemistry* / Q000648:ultrastructure; D007091:Image Processing, Computer-Assisted; D008854:Microscopy, Electron; D008954:Models, Biological; D008958:Models, Molecular; D055503:Protein Multimerization; D017434:Protein Structure, Tertiary; D017923:Sodium-Hydrogen Exchangers / Q000737:chemistry* / Q000648:ultrastructure
chemical_list: D029681:Arabidopsis Proteins; C477653:SOS1 protein, Arabidopsis; D017923:Sodium-Hydrogen Exchangers