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Hapsidospora chrysogena

ABSTRACT: Acremonium chrysogenum mRNA-seq

PROVIDER: PRJNA353580 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR5020671.fastq.gz	Fastqsanger.gz
	SRR5020672.fastq.gz	Fastqsanger.gz
	SRR5020673.fastq.gz	Fastqsanger.gz
	SRR5020674.fastq.gz	Fastqsanger.gz
	SRR5020675.fastq.gz	Fastqsanger.gz

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A novel Myb transcription factor represses conidiation and cephalosporin production in Acremonium chrysogenum

Project description:Acremonium chrysogenum is the industrial producer of cephalosporin C. We isolated a mutant (AC554) from a T-DNA inserted library of A. chrysogenum. AC554 exhibited reduced conidiation and lack of cephalosporin C production. In consistent, the transcription of cephalosporin biosynthetic genes pcbC and cefEF was obviously decreased in AC554. TAIL-PCR and sequence analysis indicated that a T-DNA was inserted in the upstream of an open reading frame (ORF) which was designated AcmybA. Sequence analysis indicated that AcmybA encodes a novel Myb domain containing transcriptional factor. Observation of red fluorescence protein (RFP) tagged AcMybA showed that AcMybA is naturally located in the nuclear of A. chrysogenum. Transcription analysis demonstrated that AcmybA was overexpressed in AC554. In contrast with AC554, the AcmybA deleted mutant (DAcmybA) overproduced conidia in LPE medium and increased cephalosporin production during fermentation. To determine the genes under the influence of AcmybA, we sequenced and compared the transcriptome of DAcmybA, AC554 and the wild-type strain at different developmental stages. Results confirmed the repression of AcMybA on the key conidiation regulatory gene AcbrlA and the cephalosporin biosynthetic genes. Among the targets of AcMybA, 10 putative regulatory genes were selected and overexpressed in A. chrysogenum. Taken together, our results indicate that AcMybA negatively regulates conidiation and cephalosporin production in A. chrysogenum.

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Penicillium chrysogenum

Project description:Penicillium chrysogenum mRNA-seq

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Engineering of Penicillium chrysogenum for fermentative production of a novel carbamoylated cephem antibiotic precursor

Project description:Penicillium chrysogenum was successfully engineered to produce a novel carbamoylated cephalosporin that can be used as a synthon for semi-synthetic cephalosporins. To this end, structural genes for Acremonium chrysogenum expandase/hydroxylase and Streptomyces clavuligerus carbamoyltransferase were expressed in a penicillinG high-producing strain of P. chrysogenum. Growth of the engineered strain in the presence of the side-chain precursor adipic acid resulted in production of adipoyl-7-amino-3-carbamoyloxymethyl-3-cephem-4-carboxylic acid (ad7-ACCCA) and of several adipoylated pathway intermediates. A combinatorial chemostat-based transcriptome study, in which the ad7-ACCCA- producing strain and a strain lacking key genes in β-lactam synthesis were grown in the presence and absence of adipic acid, enabled the dissection of transcriptional responses to adipic acid per se and to ad7-ACCCA production. In chemostat cultures of both strains, adipic acid served as an additional carbon source. Transcriptome analysis supported an earlier proposal, based on 13C-labelling studies, that adipic acid catabolism in P. chrysogenum occurs via β-oxidation and enabled the identification of putative genes for enzymes involved in mitochondrial and peroxisomal β-oxidation pathways. Several of the genes that showed a specifically altered transcript level in ad7-ACCCA-producing cultures were previously implicated in oxidative stress responses. As strain improvement programmes lead to increased specific productivity and yields, a deeper understanding of these stress responses is likely to be important to also achieve high ad7-ACCCA titers with engineered strains of P. chrysogenum.

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