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PauA: a novel plasminogen activator from Streptococcus uberis.
E L Rosey1, R A Lincoln, P N Ward
1Institute for Animal Health Compton Laboratory, Compton, Newbury, Berks, UK.
FEMS Microbiology Letters
|September 14, 1999
Summary
Researchers cloned the Streptococcus uberis plasminogen activator gene, finding its protein sequence is distinct from streptokinase. Gene location also differs from other streptococci, suggesting unique evolutionary pathways.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Streptococcus uberis is a significant pathogen.
- Plasminogen activators play roles in bacterial virulence.
- Understanding S. uberis virulence factors is crucial for disease control.
Purpose of the Study:
- To clone and characterize the plasminogen activator from Streptococcus uberis.
- To compare the cloned gene and protein with known streptococcal plasminogen activators.
Main Methods:
- Chromosomal DNA isolation from S. uberis strains.
- Cloning of the plasminogen activator gene into Escherichia coli.
- DNA sequencing and protein analysis.
- Homology searches and gene mapping.
Main Results:
- A functional plasminogen activator gene (pauA) was cloned and expressed.
- The encoded protein (33.4 kDa) is cleaved during secretion.
- The protein showed low homology to streptokinase.
- The pauA gene is located between hexA and hexB homologues, unlike streptokinase.
Conclusions:
- The S. uberis plasminogen activator is a distinct molecule from streptokinase.
- The gene's unique genomic location suggests different evolutionary origins or regulation.
- Further research into pauA function may reveal novel virulence mechanisms.