Related Experiment Videos
Inorganic polyphosphate is required for motility of bacterial pathogens
M H Rashid1, N N Rao, A Kornberg
1Department of Biochemistry, Stanford University School of Medicine, Stanford, California 94305, USA.
Abstract:
The ppk gene encodes polyphosphate kinase (PPK), the principal enzyme in many bacteria responsible for the synthesis of inorganic polyphosphate (polyP) from ATP. A null mutation in the ppk gene of six bacterial pathogens renders them greatly impaired in motility on semisolid agar plates; this defect can be corrected by the introduction of ppk gene in trans. In view of the fact that the motility of pathogens is essential to invade and establish systemic infections in host cells, this impairment in motility suggests a crucial and essential role of PPK or polyP in bacterial pathogenesis.
Insights
The polyphosphate kinase (PPK) enzyme is crucial for bacterial motility and pathogenesis. Impaired PPK function significantly hinders bacterial movement, suggesting its essential role in disease development.
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- The ppk gene encodes polyphosphate kinase (PPK), a key enzyme in inorganic polyphosphate (polyP) synthesis from ATP in bacteria.
- Bacterial motility is vital for pathogen invasion and establishing infections within host cells.
Purpose of the Study:
- To investigate the role of the ppk gene and its encoded enzyme, polyphosphate kinase (PPK), in bacterial pathogenesis.
- To determine the impact of PPK on bacterial motility.
Main Methods:
- Generating a null mutation in the ppk gene of six bacterial pathogens.
- Assessing bacterial motility on semisolid agar plates.
- Complemented the null mutation by introducing the ppk gene in trans.
Main Results:
- A null mutation in the ppk gene significantly impaired the motility of six bacterial pathogens on semisolid agar.
- The motility defect was fully restored upon reintroduction of the functional ppk gene.
- This indicates a direct link between PPK function and bacterial motility.
Conclusions:
- Polyphosphate kinase (PPK) plays a critical role in bacterial motility.
- The observed impairment in motility suggests that PPK and its product, polyphosphate (polyP), are essential for bacterial pathogenesis.
- Targeting PPK could be a potential strategy to combat bacterial infections.