The cloned canine betaine-GABA cotransporter BGT-1 has been heterologously expressed in Xenopus laevis oocytes in order to characterize its electrophysiological properties. Voltage-clamp experiments on transfected oocytes reveal the presence of three types of membrane current which are absent in non-injected oocytes: (i) an organic substrate-independent current (uncoupled current); (ii) a transport-associated current, seen upon addition of betaine or GABA; (iii) presteady-state currents induced by voltage changes. The three kinds of current are analogous to those reported in structurally similar cotransporters. The transport-associated current is strictly dependent on the presence of Na(+). The good correlation between the amount of charge underlying the presteady-state currents and the transport-associated current indicates that both processes are due to the activity of the transporter.

Three kinds of currents in the canine betaine-GABA transporter BGT-1 expressed in Xenopus laevis oocytes / G. Forlani, E. Bossi, C. Perego, S. Giovannardi, A. Peres. - In: BIOCHIMICA ET BIOPHYSICA ACTA. - ISSN 0006-3002. - 1538:2-3(2001 Apr 23), pp. 172-80-180.

Three kinds of currents in the canine betaine-GABA transporter BGT-1 expressed in Xenopus laevis oocytes

C. Perego;
2001-04-23

Abstract

The cloned canine betaine-GABA cotransporter BGT-1 has been heterologously expressed in Xenopus laevis oocytes in order to characterize its electrophysiological properties. Voltage-clamp experiments on transfected oocytes reveal the presence of three types of membrane current which are absent in non-injected oocytes: (i) an organic substrate-independent current (uncoupled current); (ii) a transport-associated current, seen upon addition of betaine or GABA; (iii) presteady-state currents induced by voltage changes. The three kinds of current are analogous to those reported in structurally similar cotransporters. The transport-associated current is strictly dependent on the presence of Na(+). The good correlation between the amount of charge underlying the presteady-state currents and the transport-associated current indicates that both processes are due to the activity of the transporter.
Amino acid cotransport; Betaine-γ-amino-n-butyric acid transporter-1; Xenopus oocyte
Settore BIO/09 - Fisiologia
BIOCHIMICA ET BIOPHYSICA ACTA
http://www.sciencedirect.com/science/article/pii/S0167488900001440
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/185180
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