The complete phosphotransferase system in Escherichia coli

Area of Science:

• Microbiology
• Molecular Biology
• Genomics

Background:

• The phosphoenolpyruvate:sugar phosphotransferase system (PTS) is crucial for sugar uptake and metabolism in bacteria.
• Understanding the diversity and function of PTS proteins is essential for comprehending bacterial physiology.

Purpose of the Study:

• To comprehensively tabulate and describe all recognized PTS proteins and their homologues in sequenced E. coli strains.
• To identify and characterize potential regulatory PTS proteins and Enzyme II complexes.
• To present phylogenetic data for major PTS protein families.

Main Methods:

• Bioinformatic analysis of sequenced E. coli genomes.
• Identification and classification of PTS protein families (Enzyme I, HPr, Enzyme II complexes).
• Phylogenetic analysis of major PTS protein families.

Main Results:

• Identified five Enzyme I homologues and six HPr homologues.
• Described a nitrogen-metabolic PTS pathway and a regulatory tri-domain PTS protein.
• Cataloged 21 (possibly 22) recognized Enzyme II complexes, categorized into fructose, glucose, and other families.
• Presented phylogenetic data for key PTS protein families.

Conclusions:

• E. coli possesses a diverse array of PTS proteins, including multiple homologues and regulatory components.
• The identified Enzyme II complexes represent significant diversity within fructose, glucose, and other PTS permease families.
• This comprehensive inventory provides a foundation for further research into PTS function and regulation in E. coli.