Tween 80 effect on glucosyltransferase synthesis by Streptococcus salivarius

Area of Science:

• Microbiology
• Enzymology
• Biochemistry

Background:

• Streptococcus salivarius produces extracellular glucosyltransferase (GTase).
• GTase production is typically low in chemically defined media.
• Understanding factors that enhance GTase production is crucial for biotechnological applications.

Purpose of the Study:

• To investigate the effect of Tween 80 on glucosyltransferase (GTase) production by Streptococcus salivarius.
• To determine the mechanism by which Tween 80 influences GTase levels.

Main Methods:

• Culturing Streptococcus salivarius in a chemically defined medium with and without Tween 80.
• Measuring extracellular GTase activity.
• Assessing the effect of Tween 80 on cell-free enzyme activity.
• Investigating GTase production in non-growing cell suspensions with chloramphenicol treatment.

Main Results:

• Tween 80 markedly enhanced extracellular GTase production.
• Other tested substances (oleic acid, sucrose) did not substitute for Tween 80.
• Tween 80 did not directly activate pre-formed GTase.
• Tween 80 stimulated GTase synthesis even in non-growing cells, an effect inhibited by chloramphenicol.

Conclusions:

• Tween 80 significantly stimulates the production of extracellular glucosyltransferase (GTase) by Streptococcus salivarius.
• The mechanism involves enhancing enzyme synthesis, not direct enzyme activation.
• The effect is linked to the synthesis process, as indicated by chloramphenicol's inhibitory action.