BB-norm@ldeleger:BB-norm-11395453 JSONTXT

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Id Subject Object Predicate Lexical cue
T1 0-69 Title denotes Signaling system in Porphyromonas gingivalis based on a LuxS protein.
T3 20-44 Microorganism denotes Porphyromonas gingivalis
T2 70-1079 Paragraph denotes The luxS gene of quorum-sensing Vibrio harveyi is required for type 2 autoinducer production. We identified a Porphyromonas gingivalis open reading frame encoding a predicted peptide of 161 aa that shares 29% identity with the amino acid sequence of the LuxS protein of V. harveyi. Conditioned medium from a late-log-phase P. gingivalis culture induced the luciferase operon of V. harveyi, but that from a luxS insertional mutant did not. In P. gingivalis, the expression of luxS mRNA was environmentally controlled and varied according to the cell density and the osmolarity of the culture medium. In addition, differential display PCR showed that the inactivation of P. gingivalis luxS resulted in up-regulation of a hemin acquisition protein and an arginine-specific protease and reduced expression of a hemin-regulated protein, a TonB homologue, and an excinuclease. The data suggest that the luxS gene in P. gingivalis may function to control the expression of genes involved in the acquisition of hemin.
T4 87-101 Phenotype denotes quorum-sensing
T5 102-116 Microorganism denotes Vibrio harveyi
T6 180-204 Microorganism denotes Porphyromonas gingivalis
T7 340-350 Microorganism denotes V. harveyi
T8 352-414 Habitat denotes Conditioned medium from a late-log-phase P. gingivalis culture
T9 393-406 Microorganism denotes P. gingivalis
T10 448-458 Microorganism denotes V. harveyi
T11 476-499 Phenotype denotes luxS insertional mutant
T12 512-525 Microorganism denotes P. gingivalis
T13 653-667 Habitat denotes culture medium
T14 739-752 Microorganism denotes P. gingivalis
T15 980-993 Microorganism denotes P. gingivalis