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Transport Proteins - Physiology (view source)
Revision as of 14:06, 15 August 2008
, 14:06, 15 August 2008no edit summary
* Some of the proteins bind a small number of differant molecules. These molecules will compete for the proteins and will be transported in similar relative quantites to their original concentrations.
* Some of the proteins bind a small number of differant molecules. These molecules will compete for the proteins and will be transported in similar relative quantites to their original concentrations.
==Co-Transporters==
==ATPases==
These proteins are enzymes which are catalysts for the decomposition of ATP to ADP + Pi. This releases energy which the protein utilises. The transmembrane ATPases are essential for transporting substances across membranes and play vital roles in both primary and secondary [[Active Transport - Physiology| active transport]]. The main types of ATPase transporter are the co-transporters and the pumps. However some of the pumps are also technically co-transporters. If they cause a netflow of charge for example the sodium/potassium pump they are called '''electrogenic''' transporters.
===Co-Transporters===
This family of ATPase membrane proteins are involved in [[Active Transport - Physiology#Secondary Active Transport|Secondary Active Transport]]. They bind two molecules and transport them accross the membrane either in the same direction ('''symporter''') or in opposite directions ('''antiporter'''). The [[Active Transport - Physiology#Development of Potential Energy|potential energy]] derived from forcing one molecule across this allows the other cotransported molecule to be transported against its gradient.
==More Information==
==More Information==
If more information on Facilitated Diffusion is need it can be found [http://en.wikipedia.org/wiki/Passive_diffusion here]
If more information on Facilitated Diffusion is need it can be found [http://en.wikipedia.org/wiki/Passive_diffusion here]