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  • Title: Chloride dependence of the sodium-dependent glycine transport in pig kidney cortex brush-border membrane vesicles.
    Author: Scalera V, Corcelli A, Frassanito A, Storelli C.
    Journal: Biochim Biophys Acta; 1987 Sep 18; 903(1):1-10. PubMed ID: 3651446.
    Abstract:
    The Na+-dependent glycine uptake in pig kidney cortex brush-border membrane vesicles is specifically enhanced by the presence of Cl-. The Na+-independent glycine uptake is not affected by Cl-. Various anions tested could not substitute Cl- in the activation of the Na+-dependent glycine transport. Cl- is specifically required on the outer membrane side. The Na+-dependent glycine uptake is higher in the presence of an inwardly directed Cl- gradient than the one measured in the presence of equilibrated Cl-. The Na+-dependent glycine uptake depends on, and is saturable at increasing Cl- concentrations. By studying the activation of glycine uptake by Na+ in the presence and in the absence of Cl-, evidence was found that two different Na+-dependent glycine transport pathways are present in pig kidney cortex brush-border membrane vesicles. The kinetics of the glycine uptake measured in the presence of an inwardly directed NaCl gradient show the presence of two glycine transport systems, a low-affinity, high-capacity one and a high-affinity, low capacity one. In the absence of Cl- the high-affinity, low-capacity transport is almost suppressed, thus indicating the presence of a high-affinity glycine transport system simultaneously dependent on both Na+ and Cl- ions.
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