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Phosphorylation of highly conservative Thr-551 situated in the catalytic center inhibits pump activity. A, shown is abolishment of yeast growth complementation when mutant in Thr-511 AHA2 was expressed. B, in the crystal structure of AHA2, Thr-511 is situated close to Asp-329, the conserved Asp phosphorylated during catalysis (59). C, shown is a Western blot analysis of expression level of the mutant AHA2 in yeast cells.
