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The receptor Atu2422 is involved in transport of Pro. Uptake (% of total available) of radiolabeled compounds, Pro (A), Glu (B), GABA, Pro, Ala, Leu, Glu, and Arg (C), in cells of A. tumefaciens C58, and its derivatives atu2422, atu2276, braE, and aapQ. In B, uptake of Glu was measured in the absence (-) or presence of GABA (G) or Pro (P) at 1 mM. In C, asterisk indicates a significant decrease in amino acid uptake by mutant aapQ (Student's t test; P < 0.01).
