Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

RNA-Seq analysis reveals a six-gene SoxR regulon in Streptomyces coelicolor

ABSTRACT: We report 6 genes that were found to be regulated by SoxR in stationary phase when the bacteria produce the antibiotic actinorhodin. Five of these genes are previously confirmed SoxR targets; the sixth is a novel SoxR-target. RNA was obtained from 1-day or 3-day old wild type or soxR null mutant strains grown on R2YE agar complex medium. Biological replicates were obtained for 3 day-old samples. RNA was sequenced in an Illumina HiSeq 2000 sequencer for single reads of 100 bp and mapped to the S. coelicolor M145 genome.

ORGANISM(S): Streptomyces coelicolor

SUBMITTER: Joshua Shapiro

PROVIDER: E-GEOD-57268 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

RNA-Seq analysis reveals a six-gene SoxR regulon in Streptomyces coelicolor.

Naseer Nawar N Shapiro Joshua A JA Chander Monica M

PloS one 20140827 8

The redox-regulated transcription factor SoxR is conserved in diverse bacteria, but emerging studies suggest that this protein plays distinct physiological roles in different bacteria. SoxR regulates a global oxidative stress response (involving > 100 genes) against exogenous redox-cycling drugs in Escherichia coli and related enterics. In the antibiotic producers Streptomyces coelicolor and Pseudomonas aeruginosa, however, SoxR regulates a smaller number of genes that encode membrane transporte ...[more]

PMID: 25162599

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Project description:In actinomycetes, antibiotic production is often associated with a morpho-physiological differentiation program that is regulated by complex molecular and metabolic networks. Many aspects of these regulatory circuits have been already elucidated and many others still deserve further investigations. In this regard, the possible role of many small open-reading frames(smORFs) in actinomycete morpho-physiological differentiation is still elusive. In Streptomyces coelicolor, inactivation of the smORF trpM (SCO2038) - whose product modulates L-tryptophan metabolism - impairs production of antibiotics and morphological differentiation. Indeed, it was demonstrated that TrpM is able to interact with PepA (SCO2179), a putative cytosol aminopeptidase playing a key role in antibiotic production and sporulation. In this work, a S. coelicolor trpM knock-in (Sco-trpMKI) mutant strain was generated by cloning trpM into overexpressing vector to further investigate the role of trpM in actinomycete growth and morpho-physiological differentiation. Results highlighted that trpM: i) stimulates growth and actinorhodin production; ii) decreases calcium-dependent antibiotic production; iii) has no effect on undecylprodigiosin production. Metabolic pathways influenced by trpM knock-in were investigated by combining two-difference in gel electrophoresis/nanoliquid chromatography coupled to electrospray linear ion trap tandem mass spectrometry (2D-DIGE/nanoLC-ESI-LIT- MS/MS) and by LC-ESI-MS/MS procedures, respectively. These analyses demonstrated that over-expression of trpM causes an over-representation of factors involved in protein synthesis and nucleotide metabolism as well as a down-representation of proteins involved in central carbon and amino acid metabolism. At the metabolic level, this corresponded to a differential accumulation pattern of different amino acids - including aromatic ones but tryptophan – and central carbon intermediates. PepA was also down-represented in Sco-trpMKI. The latter was produced as recombinant His- tagged protein and was originally proven having the predicted aminopeptidase activity. Altogether, these results highlight the stimulatory effect of trpM in S. coelicolor growth and actinorhodin biosynthesis, which are elicited through the modulation of various metabolic pathways and PepA representation, further confirming the complexity of regulatory networks that control antibiotic production in actinomycetes.

Dataset Information

RNA-Seq analysis reveals a six-gene SoxR regulon in Streptomyces coelicolor

Publications

RNA-Seq analysis reveals a six-gene SoxR regulon in Streptomyces coelicolor.

Similar Datasets

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