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Characterization of energetically functional inverted membrane vesicles from Corynebacterium glutamicum
S Schrempp1, N Bayan, E Shechter
1Laboratoire des Biomembranes, Université de Paris Sud, Orsay, France.
FEBS Letters
|December 12, 1994
Summary
Inverted membrane vesicles from Corynebacterium glutamicum generate proton gradients using NADH, indicating a functional respiratory chain. These vesicles are promising for studying protein translocation in Gram-positive bacteria.
Area of Science:
- Microbiology
- Biochemistry
- Cell Biology
Background:
- Corynebacterium glutamicum is a Gram-positive bacterium with biotechnological relevance.
- Understanding protein translocation is crucial for bacterial physiology and function.
- Inverted membrane vesicles offer a model system to study membrane-associated processes.
Purpose of the Study:
- To characterize the functionality of inverted membrane vesicles from Corynebacterium glutamicum.
- To assess the integrity and proton permeability of these vesicles.
- To evaluate their potential for in vitro translocation studies.
Main Methods:
- Isolation of inverted membrane vesicles from Corynebacterium glutamicum.
- Measurement of proton electrochemical gradient generation in response to NADH.
- Assessment of vesicle integrity and proton leak.
Main Results:
- Inverted membrane vesicles successfully generated and maintained an electrochemical proton gradient upon NADH addition.
- The results indicate an intact respiratory chain within the vesicles.
- Vesicles demonstrated reasonable impermeability to protons.
Conclusions:
- The isolated membrane vesicles are functional and suitable for further investigation.
- These vesicles serve as a viable starting point for in vitro protein translocation studies in Gram-positive bacteria.
- This research provides a valuable tool for studying Gram-positive bacterial membrane biology.