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Microbial genome analyses: comparative transport capabilities in eighteen prokaryotes
I T Paulsen1, L Nguyen, M K Sliwinski
1The Institute for Genomic Research, 9712 Medical Center Drive, Rockville, MD 20850, USA. ipaulsen@tigr.org
Journal of Molecular Biology
|August 5, 2000
Summary
This study analyzes solute transport systems across 18 prokaryotic genomes, revealing diverse transporter families and their distribution. It highlights variations in transport capabilities among bacteria, archaea, and spirochetes, impacting our understanding of prokaryotic physiology.
Area of Science:
- Genomics
- Molecular Biology
- Biochemistry
Background:
- Solute transport systems are crucial for prokaryotic life.
- Understanding transporter diversity is key to deciphering cellular functions.
Purpose of the Study:
- To comprehensively analyze solute transport systems in 18 prokaryotic genomes.
- To classify and characterize transporter families and their distribution.
Main Methods:
- Genomic analysis of 18 prokaryotic organisms.
- Classification of membrane transport systems into 76 families.
- Analysis of protein topology, substrate specificity, and evolutionary relationships.
Main Results:
- Identified 76 transporter families, including channels, primary/secondary carriers, and group translocators.
- Transport mode correlates with energy generation; secondary transporters are proportional to primary pumps.
- Phosphotransferase system is less common than expected; E. coli has exceptional transport capabilities.
Conclusions:
- Archaea and spirochetes have fewer transmembrane proteins and transporters than most bacteria.
- Transport systems are highly relevant to prokaryotic physiology.
- E. coli is not representative of all sequenced bacteria in terms of transport.