The apo outward-facing transporter binds the substrate (blue square) and Na+ ions (pink circles) within the transport domain under the tip of HP2.
Cocaine is a transport inhibitor: it docks to the outward facing conformation of the transporter at a site, which overlaps with the substrate binding site.
The individual amphetamine-derived compounds differ in their affinity for specific transporters but their principal mechanism of action is identical: they bind to the outward facing conformation of the transporter and translocate together with Na+ and Cl− from the extracellular side into the cell interior (Rudnick and Wall, 1992; Sitte et al., 1998; Seidel et al., 2005).
Since the glial GAT-2/3 transporters are facing the extrasynaptic space instead of the synapse [ 26], the potential consequence of a transporter mediated glial GABA release is the activation of extrasynaptic GABAA receptors and the subsequent enhancement of tonic inhibition on neurons.
However, in the case of amphetamines, concentrations of substrate on the cytoplasmic (Sin) and external (Sout) faces of the transporter are both expected to follow a complex time course, if passive diffusion through the membrane is taken into account.
Cocaine binds to and stabilizes the outward- (extracellular-) facing conformation of the dopamine transporter (DAT) protein, while the low abuse potential DAT inhibitor benztropine prefers the inward- (cytoplasmic-) facing conformation.
Transporters face a challenge of milk spoilage since they transport the milk without any cooling facilities.
To demonstrate the refurbishment feasibility operations for the new ITER divertor 2001 cassettes, an experimental machine known as the plasma-facing component transporter (PFCT) has been designed, fabricated and commissioned in the years 2003 2005.
Trans-stimulation has been described as the effect of intracellular glucose binding to the facilitative transporter molecule in the inward facing conformation, stimulating re-orientation to an outward facing conformer, and increasing apparent transport.
Docking calculations and electrostatic potential maps showed that PC could interact with HMA8 with its His facing the Cu-release site of the transporter.
Johnson E, Nguyen P, Rees D.C, 2011, Inward facing conformations of the MetNI methionine ABC transporter: DM crystal form, 3TUJ ; http://dx.doi.org/10.2210/pdb3TUJ/pdb, Publicly available at the RCSB Protein Data Bank.
