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Cloning of the pfaP gene of Leptospira borgpetersenii
G A Trueba1, C A Bolin, R L Zuerner
1Leptospirosis/Mycobacteriosis Research Unit, U.S. Department of Agriculture, National Animal Disease Center, Ames, IA 50010, USA.
Abstract:
A lambda gt11 library constructed with Leptospira borgpetersenii DNA was screened with monoclonal antibodies (mAb) recognizing a periplasmic flagella-associated protein. A plaque expressing a fusion protein (lambda F15) which reacted with the mAb was isolated and the nucleotide sequence analyzed. The deduced amino-acid (aa) sequence indicates that the pfaP gene belongs to a group of bacterial genes whose products share aa sequence and possibly functional homologies with sppA, an Escherichia coli signal peptidase-encoding gene.
Insights
Researchers identified a novel gene, pfaP, in Leptospira borgpetersenii. This gene encodes a protein homologous to Escherichia coli signal peptidase, suggesting potential roles in bacterial cell wall maintenance.
Area of Science:
- Microbiology
- Molecular Biology
- Bacteriology
Background:
- Leptospira borgpetersenii is a pathogenic bacterium.
- Periplasmic flagella-associated proteins are crucial for bacterial motility and virulence.
- Understanding bacterial gene function is key to developing novel antimicrobial strategies.
Purpose of the Study:
- To identify and characterize genes encoding periplasmic flagella-associated proteins in Leptospira borgpetersenii.
- To analyze the sequence and potential function of a newly identified gene, pfaP.
Main Methods:
- Construction of a lambda gt11 expression library using Leptospira borgpetersenii DNA.
- Screening the library with monoclonal antibodies against a periplasmic flagella-associated protein.
- Isolation and sequencing of a positive clone expressing a fusion protein (lambda F15).
- Bioinformatic analysis of the deduced amino-acid sequence.
Main Results:
- A specific clone, lambda F15, was isolated, expressing a fusion protein reactive to the monoclonal antibody.
- Nucleotide sequence analysis revealed the pfaP gene.
- The deduced amino-acid sequence of PfaP shows homology to sppA, an Escherichia coli signal peptidase-encoding gene.
- This suggests PfaP belongs to a conserved family of bacterial enzymes.
Conclusions:
- The pfaP gene in Leptospira borgpetersenii encodes a protein with significant sequence and potential functional homology to bacterial signal peptidases.
- This finding provides insights into the molecular mechanisms of Leptospira and potential targets for therapeutic intervention.