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Preferential utilization of dipeptides by Porphyromonas gingivalis
1Department of Oral Biology, Tohoku University Graduate School of Dentistry, Sendai, Japan. nobu-t@mail.cc.tohoku.ac.jp
Journal of Dental Research
|July 5, 2001
Summary
Porphyromonas gingivalis bacteria preferentially use dipeptides over longer peptides or amino acids for energy. This study shows dipeptides are the key metabolic substrates for this bacterium.
Area of Science:
- Microbiology
- Bacterial Metabolism
- Oral Microbiology
Background:
- Porphyromonas gingivalis utilizes peptides for energy and cell material.
- Limited information exists on the preferred peptide sizes and types utilized by P. gingivalis.
Purpose of the Study:
- To investigate the preferential utilization of specific peptide sizes by P. gingivalis.
- To determine the metabolic fate of various peptide lengths as substrates for P. gingivalis.
Main Methods:
- Testing aspartate or glutamate monopolymers (2-100 amino acids) as metabolic substrates.
- Analyzing end-products (ammonia, organic acids) from P. gingivalis cell metabolism.
- Evaluating the metabolism of specific dipeptides (valylvaline, leucylleucine) in conjunction with aspartylaspartate or glutamylglutamate.
Main Results:
- P. gingivalis consumed aspartylaspartate and glutamylglutamate, producing significant ammonia, propionate, and butyrate.
- Metabolism of free amino acids (aspartate, glutamate) and longer peptides yielded minimal end-products.
- Valylvaline and leucylleucine metabolism occurred only when aspartylaspartate or glutamylglutamate were present, indicating a metabolic linkage.
Conclusions:
- P. gingivalis preferentially utilizes dipeptides as its primary metabolic substrates.
- Dipeptide utilization is crucial for the energy and cell material needs of P. gingivalis.
- A metabolic link exists between certain dipeptides and aspartate/glutamate-based peptides.