Tuesday, October 12, 2010

How to Make the Most of Your Chemiosmotic Coupling

So the body needs ion pumping across membranes as a necessity. It can be used for segregating macromolecules inside cellular components (often they need to be in a certain environment for optimal activity), to give macromolecules an overall net negative charge (to prevent clumping), and to maintain osmotic balance, or to osmoregulate.

So from pg 497, here are some you can make use (or more appropriate, cells force an organism to make use) of chemiosmotic coupling.

Proton pumping in chloroplasts and bacteria.
Chloroplasts are ATP-generating organelles, which use the free energy of the sunlight they absorb to pump protons across their membrane, and this proton gradient drives the "CF0CF1" complex, similar to the mitochondria complex "F0F1"
Bacteria also find their proton gradient and contain F0F1 synthases.

Flagellar Motor.
The flagella motor converts the electrochemical potential jump of protons into a mechanical torque. (to quote from pg 497 of the text)

Other Pumps.
Pumps such as the calcium ATPase are powered by ATP. There are others known as symports, and antiports.

1 comment:

  1. So do bacteria treat their entire body like our cells treat a mitochondrion? Do the F0F1 proteins function like a F0F1 proteins in a eukaryotic cell?