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Potential regulatory phosphorylation sites in a Medicago truncatula plasma membrane proton pump implicated during early symbiotic signaling in roots
Author(s) -
Nguyen Thao T.,
Volkening Jeremy D.,
Rose Christopher M.,
Venkateshwaran Muthusubramanian,
Westphall Michael S.,
Coon Joshua J.,
Ané Jean-Michel,
Sussman Michael R.
Publication year - 2015
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2015.06.035
Subject(s) - medicago truncatula , phosphorylation , complementation , microbiology and biotechnology , yeast , membrane , biology , nod factor , biochemistry , chemistry , biophysics , gene , genetics , symbiosis , root nodule , bacteria , phenotype
In plants and fungi the plasma membrane proton pump generates a large proton‐motive force that performs essential functions in many processes, including solute transport and the control of cell elongation. Previous studies in yeast and higher plants have indicated that phosphorylation of an auto‐inhibitory domain is involved in regulating pump activity. In this report we examine the Medicago truncatula plasma membrane proton pump gene family, and in particular MtAHA5. Yeast complementation assays with phosphomimetic mutations at six candidate sites support a phosphoregulatory role for two residues, suggesting a molecular model to explain early Nod factor‐induced changes in the plasma membrane proton‐motive force of legume root cells.