title: Metabolome variations in the Porphyromonas gingivalis vimA mutant during hydrogen peroxide-induced oxidative stress.
abstract: The adaptability and survival of Porphyromonas gingivalis in the oxidative microenvironment of the periodontal pocket are indispensable for survival and virulence, and are modulated by multiple systems. Among the various genes involved in P. gingivalis oxidative stress resistance, vimA gene is a part of the 6.15-kb locus. To elucidate the role of a P. gingivalis vimA-defective mutant in oxidative stress resistance, we used a global approach to assess the transcriptional profile, to study the unique metabolome variations affecting survival and virulence in an environment typical of the periodontal pocket. A multilayered protection strategy against oxidative stress was noted in P. gingivalis FLL92 with upregulation of detoxifying genes. The duration of oxidative stress was shown to differentially modulate transcription with 94 (87%) genes upregulated twofold during 10 min and 55 (83.3%) in 15 min. Most of the upregulated genes (55%), fell in the hypothetical/unknown/unassigned functional class. Metabolome variation showed reduction in fumarate and formaldehyde, hence resorting to alternative energy generation and maintenance of a reduced metabolic state. There was upregulation of transposases, genes encoding for the metal ion binding protein transport and secretion system.
authors: Division of Microbiology and Molecular Genetics, School of Medicine, Loma Linda University, Loma Linda, CA, USA; Center for Dental Research, School of Dentistry, Loma Linda University, Loma Linda, CA, USA.
authors: R M E
authors: RM
authors: McKenzie
authors: W
authors: W
authors: Aruni
authors: N A
authors: NA
authors: Johnson
authors: A
authors: A
authors: Robles
authors: Y
authors: Y
authors: Dou
authors: L
authors: L
authors: Henry
authors: D S
authors: DS
authors: Boskovic
authors: H M
authors: HM
authors: Fletcher
mesh_terms: D018829:Adhesins, Bacterial / Q000235:genetics*; D058947:Bacterial Secretion Systems; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D055442:Metabolome; D009154:Mutation; D018384:Oxidative Stress / Q000235:genetics*; D016966:Porphyromonas gingivalis / Q000235:genetics* / Q000472:pathogenicity; D059467:Transcriptome; D014774:Virulence / Q000235:genetics
chemical_list: D018829:Adhesins, Bacterial; D058947:Bacterial Secretion Systems; D006861:Hydrogen Peroxide
keywords: molecular; oral microbiology; porphyromonas