... was by electrophoretic symport, with K + being the favored cation at pH 10. Counterflow accumulation of proline was elicited by glycine and vice versa , suggesting that the two amino acids are transported by a common symporter, which we designate the pro, gly: K + symporter. L- α -Aminoisobutyric acid was the only other...

...George A. Gerencser; Bruce R. Stevens ABSTRACT Thermodynamic measurements are required to confirm whether cloned transport-associated proteins in a membrane truly constitute a functional transport system. Symport or antiport, catalyzed by native systems or by cloned proteins in membranes, can lead...