There are also uniporters within this family. There are about 74 different families of active transporter in the Major Facilitator Superfamily (MFS), which is the largest of secondary transporters using symport or antiport mechanisms. Major Facilitator Superfamily (MFS) Transporters In that case, it is not active transport since the relative concentration of the transported species on either side of the pore is less important than the mechanism by which certain species are targeted to move into and out of the nucleus. We will end with another look at the nuclear pore complex and see how it allows the movement of large proteins and RNA molecules through its pore through a very different type of mechanism. All are polytopic with alpha-helical transmembrane domains, which through a series of conformational transitions can move chemical species that are bound to the receptor or channel protein to move through the membrane through the creation of transient openings in the protein. In this chapter section, we will explore examples of several types of active transporters. electroneutral - no net electrical imbalance is generated across the membrane by symport or antiport of charged species.electrogenic - a net electrical imbalance is generated across the membrane by symport or antiport of charged species.If the species moved is charged, two other terms are used: antiport: The sodium-calcium exchanger pumps out one Ca 2 + ion (low to high concentration) driven by the influx of three Na + into the cell.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |