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Author Trefault, N.; Guzman, L.; Perez, H.; Godoy, M.; Gonzalez, B.
Title Involvement of several transcriptional regulators in the differential expression of tfd genes in Cupriavidus necator JMP134 Type
Year 2009 Publication International Microbiology Abbreviated Journal Int. Microbiol.
Volume 12 Issue 2 Pages 97-106
Keywords Cupriavidus necator; LysR transcriptional regulators; pJP4 catabolic plasmid; tfd catabolic genes
Abstract Cupriavidus necator JMP134 has been extensively studied because of its ability to degrade chloroaromatic compounds, including the herbicides 2,4-dichlorophenoxyacetic acid (2,4-D) and 3-chlorobenzoic acid (3-CB), which is achieved through the pJP4-encoded chlorocatechol degradation gene clusters: tfdC(I)D(I)E(I)F(I), and tfdD(II)C(II)E(II)F(II). The present work describes a different tfd-genes expression profile depending on whether C. necator cells were induced with 2,4-D or 3-CB. By contrast, in vitro binding assays of the Purified transcriptional activator TfdR showed similar binding to both tfd intergenic regions; these results were confirmed by in Vivo Studies of the expression of transcriptional lacZ fusions for these intergenic regions. Experiments aimed at investigating whether other pJP4 plasmid or chromosomal regulatory proteins could contribute to the differences in the response of both tfd promoters to induction by 2,4-D and 3-CB showed that the transcriptional regulators from the benzoate degradation pathway, CatR I and CatR2, affected 3-CB- and 2,4-D-related growth capabilities. It was also determined that the ISJP4-interrupted protein TfdT decreased growth on 3-CB. In addition, an ORF with 34% amino acid identity to IcIR-type transcriptional regulator members and located near the tfd(II) gene cluster module was shown to modulate the 2,4-D growth capability. Taken together, these results Suggest that tfd transcriptional regulation in C. necator JMP134 is far more complex than previously thought and that it involves proteins from different transcriptional regulator families. [Int Microbiol 2009; 12(2):97-106]
Address [Gonzalez, Bernardo] Univ Adolfo Ibanez, Fac Ingn & Ciencia, Santiago 7941169, Chile, Email: bernardo.gonzalez@uai.cl
Corporate Author Thesis
Publisher Viguera Editores, S L Place of Publication Editor
Language English Summary Language Original Title (up)
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1139-6709 ISBN Medium
Area Expedition Conference
Notes WOS:000269753900003 Approved
Call Number UAI @ eduardo.moreno @ Serial 57
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