Search results
Results from the WOW.Com Content Network
Facilitated diffusion may occur through three mechanisms: uniport, symport, or antiport. The difference between each mechanism depends on the direction of transport, in which uniport is the only transport not coupled to the transport of another solute. [4] Uniporter carrier proteins work by binding to one molecule or substrate at a time ...
The structure of Sl6 family transporters share 20-25% sequence similarity with LeuTA [6] providing an evolutionary relationship between the transporter and the leucine transporter protein. [2] Because of the similarity, the LeuTa protein provides a very close template model for the studying the transporters in greater detail. [ 1 ]
Tiagabine, a drug used as an anticonvulsant, acts by inhibiting the GABA transporter 1. Neurotransmitter transporters inhibitors Vesicular transporters could provide an alternative therapeutic target for the modulation of chemical neurotransmission, as the activity of these transporters could affect the quantity of neurotransmitter released.
Unlike channel proteins which only transport substances through membranes passively, carrier proteins can transport ions and molecules either passively through facilitated diffusion, or via secondary active transport. [11] A carrier protein is required to move particles from areas of low concentration to areas of high concentration.
The difference between passive transport and active transport is that the active transport requires energy, and moves substances against their respective concentration gradient, whereas passive transport requires no cellular energy and moves substances in the direction of their respective concentration gradient. [10]
[10] [11] [12] An analogy is the difference in transport rates between local and express subway trains. Though both types of train travel at similar velocities between stations, the local train takes much longer to reach the end of the line because it stops at every station whereas the express makes only a few stops on the way.
The rate of ion transport through the channel is very high (often 10 6 ions per second or greater). Ions pass through channels down their electrochemical gradient , which is a function of ion concentration and membrane potential, "downhill", without the input (or help) of metabolic energy (e.g. ATP , co-transport mechanisms, or active transport ...
Diagram of a voltage-gated ion channel, showing the three states: closed, open, and inactivated.Ball and chain inactivation can only happen if the channel is open. In neuroscience, ball and chain inactivation is a model to explain the fast inactivation mechanism of voltage-gated ion channels.