Non-Symbiotic Eukaryogenesis
- Membrane Evolution Theory -
Nakamura, H.
Biological Institute, Faculty of Science, Konan University, Kobe 658, JapanAll cells have a plasma membrane. The skeleton of the plasma membrane is a phospholipid bilayer, into which various kinds of organic compounds and proteins are integrated. This integration distributes the cellular life to all kinds of membranous organelles including the plasma membrane. The importance of the bilayer is to compartmentalize according to metabolism. All intracellular membranes are considered to play a role in guaranteeing the "specificity" and "speed" of metabolisms. Membranous organelles tend to progress with an increase of metabolic complexity, with evolution to organize the complexity, and with the activities of metabolism. The cyanobacterium contains complete systems for photosynthetic and respiratory metabolisms. In our Membrane Evolution Theory, we have considered that the ancestral prokaryota is an evolved cyanobacterium. Such a probable candidate cyanobacterium is Chlorogloea fritshii, which has a respiratory metabolism containing of a complete series of EM pathway-TCA cycle-respiratory chain in addition to a photosynthetic metabolism with a complete set of photosystem (I and II)- pentose phosphate cycle. The mitochondrion and chloroplast have small DNAs respectively. The symbiont theory says that this is a result of genetic transfer from the symbionts to the nucleus. However, each of the biological species has a DNA-immunization, in which the respective action by a specific enzyme works to digest other species DNA. In the present symposium, we will show our Membrane Evolution Theory for eukaryogenesis from the particular species of cyanobacterium.
| LOCATION |
DATE |
TIME |
| Lecture Hall I |
Tuesday, April 7 |
02:40 pm |