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[Complementation and function of methyl-metabolic pathway in Streptococcus mutans luxS null strain].

Yu-xia Wang1, Li Gao, Wen-xin Jiang

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Researchers complemented the activated methyl cycle (AMC) pathway in Streptococcus mutans (S. mutans) by introducing the sahH gene into a luxS null strain, restoring AI-2 production.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Streptococcus mutans (S. mutans) is a key cariogenic bacterium.
  • The luxS gene is essential for quorum sensing and AI-2 production in S. mutans.
  • Disrupting the activated methyl cycle (AMC) pathway affects bacterial metabolism and communication.

Purpose of the Study:

  • To complement the AMC pathway in an S. mutans luxS null strain with an AI-2 defect.
  • To investigate the functional expression of a heterologous gene within the S. mutans AMC pathway.

Main Methods:

  • Amplification and introduction of the Pseudomonas aeruginosa sahH gene into the S. mutans luxS null strain.
  • Confirmation of SahH heterologous expression using Western blot and reverse-transcription PCR.
  • AI-2 bioassay to assess the complementation of the AI-2 defect.

Main Results:

  • Successful transcription of sahH mRNA was confirmed in the S. mutans luxS null strain.
  • SahH protein expression was detected, indicating successful heterologous gene expression.
  • AI-2 production was restored in the complemented strain, while the luxS null and control strains showed no AI-2 production.

Conclusions:

  • The sahH gene from P. aeruginosa can functionally complement the AI-2 defect in S. mutans.
  • A new S. mutans derivative with a complemented AMC pathway was successfully constructed.
  • This study provides a method for manipulating the AMC pathway in S. mutans.