Role of glutathione metabolism of Treponema denticola in bacterial growth and virulence expression

Lianrui Chu, Zheng Dong, Xiaoping Xu, David L. Cochran, Jefferey L. Ebersole

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Hydrogen sulfide (H2S) is a major metabolic end product detected in deep periodontal pockets that is produced by resident periodontopathic microbiota associated with the progression of periodontitis. Treponema denticola, a member of the subgingival biofilm at disease sites, produces cystalysin, an enzyme that catabolizes cysteine, releasing H2S. The metabolic pathway leading to H2S formation in periodontal pockets has not been determined. We used a variety of thiol compounds as substrates for T. denticola to produce H2S. Our results indicate that glutathione, a readily available thiol source in periodontal pockets, is a suitable substrate for H2S production by this microorganism. In addition to H2S, glutamate, glycine, ammonia, and pyruvate were metabolic end products of metabolism of glutathione. Cysteinyl glycine (Cys-Gly) was also catabolized by the bacteria, yielding glycine, H2S, ammonia, and pyruvate. However, purified cystalysin could not catalyze glutathione and Cys-Gly degradation in vitro. Moreover, the enzymatic activity(ies) in T. denticola responsible for glutathione breakdown was inactivated by trypsin or proteinase K, by heating (56°C) and freezing (-20°C), by sonication, and by exposure to Nα-p-tosyl-L-lysine chloromethyl ketone (TLCK). These treatments had no effect on degradation of cysteine by the purified enzyme. In this study we delineated an enzymatic pathway for glutathione metabolism in the oral spirochete T. denticola; our results suggest that glutathione metabolism plays a role in bacterial nutrition and potential virulence expression.

Original languageEnglish (US)
Pages (from-to)1113-1120
Number of pages8
JournalInfection and Immunity
Volume70
Issue number3
DOIs
StatePublished - Mar 4 2002

Fingerprint

Treponema denticola
Glutathione
Virulence
Periodontal Pocket
cysteinylglycine
Growth
Pyruvic Acid
Ammonia
Sulfhydryl Compounds
Glycine
Cysteine
Endopeptidase K
Spirochaetales
Hydrogen Sulfide
Sonication
Periodontitis
Microbiota
Enzymes
Biofilms
Metabolic Networks and Pathways

ASJC Scopus subject areas

  • Parasitology
  • Microbiology
  • Immunology
  • Infectious Diseases

Cite this

Role of glutathione metabolism of Treponema denticola in bacterial growth and virulence expression. / Chu, Lianrui; Dong, Zheng; Xu, Xiaoping; Cochran, David L.; Ebersole, Jefferey L.

In: Infection and Immunity, Vol. 70, No. 3, 04.03.2002, p. 1113-1120.

Research output: Contribution to journalArticle

Chu, Lianrui ; Dong, Zheng ; Xu, Xiaoping ; Cochran, David L. ; Ebersole, Jefferey L. / Role of glutathione metabolism of Treponema denticola in bacterial growth and virulence expression. In: Infection and Immunity. 2002 ; Vol. 70, No. 3. pp. 1113-1120.
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