NDLI: Leafy Gall Formation Is Controlled by fasR, an AraC-Type Regulatory Gene in Rhodococcus fascians

Content Provider	PubMed Central
Author	Temmerman, Wim Danny, Vereecke Dreesen, Rozemarijn Montagu, Marc Van Marcelle, Holsters Goethals, Koen
Copyright Year	2000
Abstract	Rhodococcus fascians can interact with many plant species and induce the formation of either leafy galls or fasciations. To provoke symptoms, R. fascians strain D188 requires pathogenicity genes that are located on a linear plasmid, pFiD188. The fas genes are essential for virulence and constitute an operon that encodes, among other functions, a cytokinin synthase gene. Expression of the fas genes is induced by extracts of infected plant tissue only. We have isolated an AraC-type regulatory gene, fasR, located on pFiD188, which is indispensable for pathogenesis and for fas gene expression. The combined results of our experiments show that in vitro expression of the fas genes in a defined medium is strictly regulated and that several environmental factors (pH, carbon and nitrogen sources, phosphate and oxygen content, and cell density) and regulatory proteins are involved. We further show that expression of the fas genes is controlled at both the transcriptional and the translational levels. The complex expression pattern probably reflects the necessity of integrating a multitude of signals and underlines the importance of the fas operon in the pathogenicity of R. fascians.
Starting Page	5832
File Format	PDF
ISSN	10985530
e-ISSN	10985530
Journal	Journal of Bacteriology
Issue Number	20
Volume Number	182
Language	English
Publisher	American Society for Microbiology
Publisher Date	2000-10-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Molecular Biology Microbiology

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