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Something from almost nothing: carbon dioxide fixation in chemoautotrophs
J M Shively1, G van Keulen, W G Meijer
1Department of Biological Sciences, Clemson University, South Carolina 29634, USA. sjessup@clemson.edu
Annual Review of Microbiology
|January 19, 1999
Summary
Chemoautotrophic bacteria fix CO2 using the Calvin-Benson-Bassham cycle, with key enzymes often localized in carboxysomes. Gene expression is regulated by carbon availability and transcriptional regulators like CbbR.
Area of Science:
- Microbial Physiology
- Bacterial Ecology
- Molecular Biology
Background:
- Chemoautotrophic bacteria are vital for many ecosystems, utilizing CO2 fixation.
- CO2 fixation primarily occurs through the Calvin-Benson-Bassham cycle.
- This cycle involves unique enzymes like ribulose bisphosphate carboxylase/oxygenase.
Purpose of the Study:
- To review recent advances in chemoautotrophic bacteria.
- To discuss the physiology, ecology, and molecular biology of these organisms.
- To detail the mechanisms of CO2 fixation and gene regulation.
Main Methods:
- Review of existing literature on chemoautotrophic bacteria.
- Analysis of the Calvin-Benson-Bassham cycle and its enzymes.
- Examination of carboxysome structure and gene organization.
Main Results:
- Significant progress in understanding chemoautotrophs over the past decade.
- Carboxysomes are key organelles for ribulose bisphosphate carboxylase/oxygenase.
- cbb gene expression is regulated by carbon/substrate availability and CbbR.
Conclusions:
- Chemoautotrophic bacteria play a crucial role in global carbon cycles.
- Carboxysome formation and cbb gene regulation are complex processes.
- Further research continues to elucidate these essential microbial systems.