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E1/E2 type cation transport ATPases: evidence for transient associations between protomers
1Biotechnological Center of M. V. Lomonosov Moscow State University, Russia.
The International Journal of Biochemistry
|December 1, 1994
Summary
E1/E2 type cation transport ATPases exist in different forms. E2 forms associate into complexes, while E1 forms do not, suggesting monomer associations are key to ion transport.
Area of Science:
- Biochemistry
- Membrane Biology
- Enzyme Kinetics
Background:
- E1/E2 type cation transport ATPases are crucial membrane proteins.
- These ATPases are known to exist in distinct conformational states, influencing their function.
- Understanding these states is vital for elucidating ion transport mechanisms.
Purpose of the Study:
- To review recent evidence characterizing E1/E2 ATPase conformers in membrane environments.
- To propose a consensus view on the oligomeric behavior of different ATPase states.
- To suggest the role of transient monomer associations in ion translocation.
Main Methods:
- Literature review of recent experimental evidence.
- Analysis of data characterizing ATPase conformers in membrane.
- Synthesis of findings to propose a consensus model.
Main Results:
- E2 conformers of cation transport ATPases tend to form oligomeric complexes through lateral association of protomers.
- E1 conformers exhibit behavior opposite to E2 conformers, favoring dissociation.
- A consensus view suggests distinct oligomeric behaviors for E1 and E2 states.
Conclusions:
- Transient associations between monomers are likely a common feature of the ion translocation mechanism.
- The conformational state (E1 or E2) dictates the oligomeric behavior of ATPases.
- This dynamic oligomerization is proposed as a key aspect of physiological ion transport.