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Coagulase production by injured Staphylococcus aureus MF-31 during recovery
Abstract:
Suspensions of Staphylococcus aureus MF-31 injured by heat treatment at 54 C for 15 min produced coagulase during recovery in Trypticase Soy Broth. Coagulase also was produced by injured cells during recovery in a medium that did not support growth. Coagulase synthesis during recovery was independent of the molar strength of the buffer in which the cells were injured, the age of the cells, and the degree of injury. Return of salt tolerance and coagulase production required glucose, amino acids, and phosphate in the recovery medium. Vitamins stimulated coagulase production, but did not affect recovery. Although coagulase production was not necessary for repair of thermal injury to S. aureus MF-31, its detection was interpreted as an indicator of protein synthesis.
Insights
Heat-injured Staphylococcus aureus (S. aureus) produced coagulase during recovery, even without growth. Coagulase production indicates protein synthesis and requires specific nutrients for recovery and salt tolerance.
Area of Science:
- Microbiology
- Bacterial Physiology
- Food Safety
Background:
- Staphylococcus aureus (S. aureus) is a common pathogen.
- Bacterial injury can affect virulence factor production.
- Understanding recovery mechanisms is crucial for controlling S. aureus.
Purpose of the Study:
- To investigate coagulase production in heat-injured S. aureus MF-31 during recovery.
- To determine factors influencing coagulase synthesis and salt tolerance.
- To assess coagulase production as an indicator of bacterial repair.
Main Methods:
- Heat treatment of S. aureus MF-31 at 54°C for 15 minutes.
- Incubation of injured cells in various recovery media (Trypticase Soy Broth, non-growth media).
- Analysis of coagulase production, salt tolerance, and nutrient requirements (glucose, amino acids, phosphate, vitamins).
Main Results:
- Heat-injured S. aureus MF-31 produced coagulase during recovery in both growth and non-growth media.
- Coagulase synthesis was independent of buffer strength, cell age, and injury degree.
- Recovery of salt tolerance and coagulase production required glucose, amino acids, and phosphate.
- Vitamins stimulated coagulase production but did not influence thermal injury repair.
Conclusions:
- Coagulase production by heat-injured S. aureus MF-31 is a marker for protein synthesis during the recovery phase.
- Specific nutrients are essential for the restoration of both coagulase production and salt tolerance.
- Coagulase detection can serve as an indirect indicator of cellular repair processes in S. aureus.