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A function of 40 kDa outer membrane protein in Serratia marcescens
1Department of Bacteriology, Kinki University School of Medicine, Osaka, Japan.
Microbiology and Immunology
|January 1, 1994
Summary
A 40 kDa outer membrane protein in Serratia marcescens binds calcium and is crucial for cell wall integrity. Its absence increases spheroplast formation and fragility, indicating a vital structural role.
Area of Science:
- Microbiology
- Bacterial Cell Wall Structure
- Outer Membrane Proteins
Background:
- Serratia marcescens possesses various outer membrane proteins that contribute to its cellular functions.
- The structural integrity of bacterial cell walls is essential for survival under environmental stress.
Purpose of the Study:
- To investigate the specific function of a prominent 40 kDa outer membrane protein in Serratia marcescens.
- To determine the role of this protein in maintaining bacterial cell wall stability.
Main Methods:
- Induction of spheroplast formation in Serratia marcescens under varying conditions.
- Analysis of outer membrane protein content in wild-type and mutant strains.
- Autoradiography to identify calcium-binding proteins within the outer membrane.
Main Results:
- A high rate of spheroplast formation was observed in Serratia marcescens with abundant 40 kDa protein, especially in the presence of calcium.
- Spheroplasts formed were fragile in isotonic environments.
- Mutant strains lacking the 40 kDa protein showed significantly reduced spheroplast induction.
- Autoradiography confirmed the 40 kDa protein as a calcium-binding protein.
Conclusions:
- The 40 kDa outer membrane protein plays a critical role in maintaining the structural integrity of the Serratia marcescens cell wall.
- This protein's calcium-binding ability is linked to its function in preventing osmotic shock-induced cell lysis.