1887

Abstract

The transcriptional regulator GlxR has been characterized as a global hub within the gene-regulatory network of . Chromatin immunoprecipitation with a specific anti-GlxR antibody and subsequent high-throughput sequencing (ChIP-seq) was applied to to get new insights into the gene composition of the GlxR regulon. In a comparative approach, cells were grown with either glucose or acetate as the sole carbon source prior to immunoprecipitation. High-throughput sequencing resulted in 69 million reads and 2.6 Gb of genomic information. After mapping of these data on the genome sequence of , 107 enriched DNA fragments were detected from cells grown with glucose as carbon source. GlxR binding sites were identified in the sequence of 79 enriched DNA fragments, of which 21 sites were not previously reported. Electrophoretic mobility shift assays with 40-mer oligomers covering the GlxR binding sites were performed for validation of the results. The detection of new binding sites confirmed the role of GlxR as a regulator of carbon source metabolism and energy conversion, but additionally revealed binding of GlxR in front of the 6C non-coding RNA gene and to non-canonical DNA binding sites within protein-coding regions. The present study underlines the dynamics within the GlxR regulon by identifying targets during growth on glucose and contributes to the expansion of knowledge of this important transcriptional regulator.

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2013-01-01
2019-08-20
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