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Genome-wide analyses of C. glutamicum SigD

ABSTRACT: Genome-wide analyses of C. glutamicum SigD

PROVIDER: PRJNA397428 | ENA |

REPOSITORIES: ENA

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Project description:Genome-wide analyses of C. glutamicum SigC

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Project description:In this study, disruption and overexpression of sigD were performed in Corynebacterium glutamicum and analyzed by transcriptome sequencing (RNA-seq) to understand the SigD regulon in C. glutamicum. For the effect of sigD overexpression, the relative abundance of mRNA was compared in WT(pVWEx1-sigD) without IPTG or with 50 M of IPTG. For the effect of sigD disruption, the abundance was compared between the sigD disrupted mutant and the wild type strain.

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Project description:(Coryno)mycolate is a α-branched, β-hydroxylated long-chain fatty acid specifically synthesized in bacteria in the suborder Corynebacterineae of the phylum Actinobacteria. It forms an outer membrane and functions as a permeability barrier conferring pathogenic mycobacteria to resistance to antibiotics. Whereas mycolate biosynthetic pathway has been intensively studied, the studies on the transcriptional regulation of genes involved in the pathway are limited. Here, we report that the previously uncharacterized extracytoplasmic function σ factor, σD, is a key regulator of the mycolate synthetic genes in Corynebacterium glutamicum in the suborder. Chromatin immunoprecipitation with microarray analysis detected σD-binding regions in the genome, establishing a consensus promoter sequence for σD recognition. The σD regulon comprises acyl-CoA carboxylase subunits, acyl-AMP ligase, polyketide synthase, and mycolyltransferases, all of which are involved in mycolate synthesis. Actually, deletion or overexpression of sigD encoding σD modified the amount of extractable mycolate. Immediately downstream of sigD, rsdA encoded anti-σD and was under the control of a σD-dependent promoter. Another σD regulon member, L,D-transpeptidase, conferred lysozyme resistance. Thus, σD modifies cell wall composition and enhances mycolate synthesis to provide resistance to environmental stress.

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Project description:To identify genes which are differentially expressed in Corynebacterium glutamicum in the cg2699 deletion strain, we performed DNA microarray analyses of C. glutamicum Δcg2699 compared to the WT.

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Genome-wide analyses of C. glutamicum SigD

Project description:This SuperSeries is composed of the SubSeries listed below.

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