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Methyl-accepting taxis proteins in Halobacterium halobium
M Alam1, M Lebert, D Oesterhelt
1Biochemistry/Biophysics Program, Washington State University, Pullman 99164-4660.
The EMBO Journal
|February 1, 1989
Summary
Methyl-accepting proteins in Halobacterium halobium are crucial for both chemotaxis and phototaxis. Methylation and demethylation processes are directly involved in sensory adaptation for these movements.
Area of Science:
- Microbiology
- Biochemistry
- Cellular Biology
Background:
- Halobacterium halobium exhibits both chemotaxis and phototaxis.
- Methyl-accepting taxis proteins (MATPs) are known sensory components in bacterial signaling.
Purpose of the Study:
- To identify and characterize MATPs in Halobacterium halobium.
- To investigate the role of methylation and demethylation in chemotaxis and phototaxis adaptation.
Main Methods:
- Electrophoresis and fluorography to identify and label methyl-accepting species.
- Analysis of radiolabeled methyl group release to measure demethylation rates.
- Comparison of responses in wild-type and taxis-mutant strains.
Main Results:
- Identified methyl-accepting species (90-135 kDa) absent in a taxis-mutant, indicating sensory roles.
- Observed changes in methylation patterns correlating with positive and negative chemostimuli.
- Detected transient demethylation rate changes following chemo- and photostimuli, linked to adaptation times.
Conclusions:
- Methylation and demethylation are directly involved in the adaptation mechanisms of both chemotaxis and phototaxis in Halobacterium halobium.
- Specific methyl-accepting proteins function as sensory components in these taxis pathways.
- Demethylation rates dynamically change in response to stimuli, reflecting adaptation processes.