[Differential proteomics on synthetic antimicrobial decapeptide against Streptococcus mutans]

Area of Science:

• Microbiology
• Proteomics
• Biochemistry

Background:

• Streptococcus mutans is a primary cause of dental caries.
• Decapeptide (KKVVFKVKFK-NH2) exhibits preferential antibacterial activity against S. mutans and inhibits biofilm formation.
• Understanding decapeptide's molecular targets is crucial for developing novel anti-caries strategies.

Purpose of the Study:

• To compare protein expression profiles between decapeptide-treated and untreated planktonic S. mutans cells.
• To identify key proteins affected by decapeptide treatment using differential proteomic analysis.
• To verify changes in specific protein expression, such as enolase.

Main Methods:

• Synthesis of decapeptide.
• Differential proteomic analysis of S. mutans using two-dimensional gel electrophoresis (2D-PAGE).
• Identification of proteins using matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS).
• Verification of enolase protein expression levels via Western blot.

Main Results:

• Decapeptide treatment significantly altered the protein expression profile of planktonic S. mutans.
• Affected proteins are involved in diverse cellular functions including glycolysis, protein folding, transport, and gene regulation.
• Western blot analysis confirmed a significant decrease in enolase protein expression in decapeptide-treated S. mutans cells.

Conclusions:

• Synthetic antimicrobial decapeptide significantly impacts S. mutans protein expression.
• Decapeptide's effect on key proteins like enolase suggests a potential mechanism for combating oral caries.
• Decapeptide represents a promising therapeutic agent for targeting S. mutans and preventing dental caries.