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Title of Journal: Appl Microbiol Biotechnol

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Abbravation: Applied Microbiology and Biotechnology

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Springer Berlin Heidelberg

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DOI

10.1007/BFb0096829

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ISSN

1432-0614

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Metabolic responses of Emphasis Type="Italic"Rho

Authors: Krisztián Laczi Ágnes Kis Balázs Horváth Gergely Maróti Botond Hegedüs Katalin Perei Gábor Rákhely
Publish Date: 2015/09/08
Volume: 99, Issue: 22, Pages: 9745-9759
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Abstract

Rhodococcus erythropolis PR4 is able to degrade diesel oil normal iso and cycloparaffins and aromatic compounds The complete DNA content of the strain was previously sequenced and numerous oxygenase genes were identified In order to identify the key elements participating in biodegradation of various hydrocarbons we performed a comparative whole transcriptome analysis of cells grown on hexadecane diesel oil and acetate The transcriptomic data for the most prominent genes were validated by RTqPCR The expression of two genes coding for alkane1monooxygenase enzymes was highly upregulated in the presence of hydrocarbon substrates The transcription of eight phylogenetically diverse cytochrome P450 cyp genes was upregulated in the presence of diesel oil The transcript levels of various oxygenase genes were determined in cells grown in an artificial mixture containing hexadecane cycloparaffin and aromatic compounds and six cyp genes were induced by this hydrocarbon mixture Five of them were not upregulated by linear and branched hydrocarbons The expression of fatty acid synthase I genes was downregulated by hydrocarbon substrates indicating the utilization of external alkanes for fatty acid synthesis Moreover the transcription of genes involved in siderophore synthesis iron transport and exopolysaccharide biosynthesis was also upregulated indicating their important role in hydrocarbon metabolism Based on the results complex metabolic response profiles were established for cells grown on various hydrocarbons Our results represent a functional annotation of a rhodococcal genome provide deeper insight into molecular events in diesel/hydrocarbon utilization and suggest novel target genes for environmental monitoring projectsThis research was supported by the European Union and cofinanced by the European Social Fund grant agreement no TÁMOP424A/ 211/120120001 ‘National Excellence Program’ TÁMOP411C12/1/KONV20120012 and by the Norway Grant grant agreement no HU090044A12013This study was funded by the European Union and cofinanced by the European Social Fund grant agreement no TÁMOP424A/ 211/120120001 ‘National Excellence Program’ Krisztián Laczi and TÁMOP411C12/1/KONV20120012 and by the Norway Grant grant agreement no HU090044A12013

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