MICROM 410 Lecture Notes - Lecture 6: Electron Acceptor, Nitrate Reductase, Anaerobic Respiration
Document Summary
Energy lost is used to drive the creation of a protein motive force. Complex i: a dehydrogenase that consists of 14 di erent proteins with a avin and iron sulfur protein, which engage in redox reactions. Complex iii: involves iron sulfur proteins and cytochromes. Complex iv- an oxidase complex that passes the electron to the terminal electron acceptor (reduces the terminal electron acceptor): coli has a very simple etc, that can change according to environmental conditions. Etc can be regulated depending upon environmental conditions. Acidic conditions-high hydrogen ion concentration on the cell"s exterior. Etc, reduce the number of protons it pumps out. Complex 1 is changed so that it kicks out a reduced number of protons. Under low oxygen tension-produce a di erent complex 4 cytochrome (cytochrome o to cytochrome bd complex). This complex is good at oxygen scavenging when it is scarce. However, it doesn"t pump out protons in the last step of the etc.
