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• W2091266125 abstract "Several reports have supported the association of Porphyromonas gingivalis with periodontal disease. Genetic studies are vital for understanding the relative importance of virulence factors in this organism. Thus, gene reporters may prove useful for the study of gene expression in this organism. We have investigated the use of the green fluorescent protein (GFP), bacterial luciferase, and bifunctional xylosidase/arabinosidase enzyme (XA) as reporters of gene expression in P. gingivalis. Fusion cassettes containing the promoterless tetracycline resistant gene [tetA(A)Q2] and the promoterless gfp,luxAB, or xa gene were placed under the control of the rgpA promoter in P. gingivalis W83 using recombinational allelic exchange. The rgpA gene encodes for an arginine-specific protease in P. gingivalis. No GFP activity was detected in P. gingivalis isogenic mutants carrying the rgpA::gfp–tetA(Q)2 fusion construct. Luciferase activity in P. gingivalis mutants carrying the rgpA::luxAB–tetA(Q)2 fusion was only detected in the presence of exogenous FMNH2. xa gene expression in P. gingivalis with the rgpA::xa–tetA(Q)2 fusion construct was detected in crude extracts using ρ-nitrophenol derivatives as substrate and on agar plates with methylumbelliferyl derivatives under long-wave ultraviolet light. This indicates that both luxAB and xa genes can be used as reporters of gene expression in P. gingivalis. However, only the xa gene can be used as a noninvasive reporter gene." @default.
• W2091266125 created "2016-06-24" @default.
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• W2091266125 date "2000-11-01" @default.
• W2091266125 modified "2023-10-18" @default.
• W2091266125 title "Development of a Noninvasive Reporter System for Gene Expression in Porphyromonas gingivalis" @default.
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• W2091266125 doi "https://doi.org/10.1006/plas.2000.1486" @default.
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