Abnormal autolytic enzyme in a pneumococus with altered teichoic acid composition.

Area of Science:

• Microbiology
• Biochemistry

Background:

• Pneumococci bacteria possess cell walls containing teichoic acid, a polymer crucial for cell integrity.
• Teichoic acid typically includes a choline component, influencing bacterial autolytic enzymes.

Purpose of the Study:

• To investigate the properties of autolytic enzymes in pneumococci with modified cell wall composition.
• To understand the impact of replacing choline with ethanolamine on autolysin activity and structure.

Main Methods:

• Culturing pneumococci with cell walls where choline is replaced by ethanolamine.
• Characterizing the molecular weight and activity of the resulting autolytic enzyme.
• In vitro incubation of the abnormal autolysin with choline-containing cell walls.

Main Results:

• Pneumococci with ethanolamine instead of choline in their teichoic acid produced an autolytic enzyme with low molecular weight and low activity.
• The typical autolytic enzyme from choline-containing bacteria exhibits high molecular weight and high activity.
• Incubation with choline-containing cell walls converted the abnormal (ethanolamine-type) autolysin to the normal (choline-type) enzyme.

Conclusions:

• The choline component of cell wall teichoic acid is essential for the production of a high-molecular-weight, high-activity autolytic enzyme in pneumococci.
• Autolysin activity and structure are directly influenced by the specific components of the bacterial cell wall.
• The abnormal autolysin can be functionally restored by providing the necessary choline component in vitro.