Unknown,Transcriptomics,Genomics,Proteomics

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Whole track RNAseq of two vector integration mutants of Actinoplanes sp. SE50/110 (pSET152::acbB and pSETT4::acbB).

ABSTRACT: The whole coding RNA of Actinoplanes sp. SE50/110 mutants containing two different integrative vectors (pSET152::acbB and pSETT4::acbB) were sequenced. Both vectors are integrated via a phiC31 integrase (Bierman et al. 1992) into the genetic locus ACSP50_6589 (former: acpl_6602) (Gren et al. 2016). The novel expression vector pSETT4 is excelled by an easy cloning mechanism allowing the integration of different promoters. By this, the system can be quickly adapted to further species of the order Actinomycetales. Additionally, T4-terminators were introduced before and after the expression cassette, since they are able to block the transcription efficiently and prevent antisense formation and read-through from the integrase gene into the gene of interest.

INSTRUMENT(S): Illumina MiSeq

ORGANISM(S): Actinoplanes sp. SE50/110

SUBMITTER: Schaffert, Lena

PROVIDER: E-MTAB-8967 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Actinoplanes sp. SE50/110 is the wild type of industrial production strains of the fine-chemical acarbose (acarviosyl-maltose), which is used as α-glucosidase inhibitor in the treatment of type II diabetes. Although maltose is an important building block of acarbose, the maltose/maltodextrin metabolism has not been studied in Actinoplanes sp. SE50/110 yet. A PurR/LacI-type transcriptional regulator gene, named amlR (ACSP50_2475), is localized upstream of the maltase gene amlE (ACSP50_2474), which is organized in an operon with and a gene downstream (ACSP50_2473) encoding a GGDEF-EAL-domain-containing protein putatively involved in c-di-GMP signaling. A targeted gene deletion mutant of amlR was constructed by use of CRISPR/Cas9 technology. The transcription of the aml operon is significantly repressed in the wild type when growing on glucose and repression is absent in an ∆amlR deletion mutant. Although AmlR apparently is a local transcriptional regulator of the aml operon, the ∆amlR strain shows severe growth inhibitions on glucose and – concomitantly – differential transcription of several genes of various functional classes, which was shown by RNAseq. We used a pooled library for RNAseq for global pre-screening and validated these results for a total of 25 genes by RT-qPCR. RNA of triplicates of the wildtype and the deletion mutant was isolated from growing cultures and pooled equimolar separately for the wildtype and the deletion mutant (total amount of 2.5 µg RNA each in 26 µL RNase-free water). rRNA was depleted using the Ribo-Zero rRNA Removal Kit for bacteria (Illumina, San Diego, USA). Successful depletion of rRNA was verified by an Agilent RNA 6000 Pico chip in the Bioanalyzer (Agilent, Böblingen, Germany). cDNA libraries were prepared following protocols from Pfeifer-Sancar et al. (2013) and Irla et al. (2015) by use of the TruSeq stranded mRNA kit (Illumina, San Diego, CA, USA). The libraries were quantified by a DNA High Sensitivity Assay chip in the Bioanalyzer (Agilent, Böblingen, Germany) and sequenced on a 2 x 75 nt HiSeq 1500 run (Illumina, San Diego, CA, USA). Sequencing yielded about 10.7 million read pairs for the wildtype library and 10.2 million read pairs for the deletion mutant library, respectively. Raw reads were quality-trimmed using Trimmomatic v0.3.5 (Bolger et al., 2014). Trimmed reads were mapped to the respective reference sequence (GenBank: LT827010.1) using bowtie2 in the paired-end mode (Langmead and Salzberg, 2012), resulting in 20.7 and 19.5 million mappings. ReadXplorer was used for visualization and differential gene expression analysis (Hilker et al., 2016).

Project description:Actinosynnema mirum cells were grown in 3 biological replicates and harvested in exponential growth phase either grown in terrific broth (TB) or in glucose-yeast-malt (GYM) medium to analyse the differential gene expression under different grwoth media. A preculture of A. mirum was grown in 20 mL NL148 medium in 100 mL shake flasks for 3 days at 28 °C and 180 rpm (2.5 cm shaking diameter). 1 mL of the preculture was transferred to 60 mL terrific broth (TB) or 60 mL glucose-yeast-malt (GYM) medium in 500 mL shake flasks cultivated for 20 h at 28 °C and 180 rpm (2.5 cm shaking diameter). Pre and main culture were cultivated in triplicates. 495 µL of cultures was transferred to 96 well plates and 5 µL ritonavir in a final concentration of 0.1 mg mL-1 was added. Samples were incubated at 28 °C, 200 rpm for 44 h. Samples were centrifuged at maximum speed for 30 s, the supernatant was removed, and samples were flash frozen in liquid nitrogen. Cells were mechanically homogenized in 1X DNA/RNA Shield™ using Bead Tubes Type B (Macherey-Nagel, Düren, Germany) in a Bead Tube Holder at maximum speed for 20 min. RNA isolation was performed using the Quick-RNA Miniprep Plus (ZYMO research, Freiburg, Germany). An additional in-column DNase I treatment was performed. RNA pellets were eluted in 100 µL DNase/RNase-free water. The purified RNA was quantified with a NanoDrop (Thermo Scientific™, Waltham, USA). RNA quality was checked by Trinean Xpose (Gentbrugge, Belgium) and Agilent RNA Nano 6000 kit on Agilent 2100 Bioanalyzer (Agilent Technologies, Böblingen, Germany). RNA was stored at -80 °C. Total-RNA with an RNA integrity number (RIN) > 9 was used to prepare cDNA libraries. Ribo-Zero rRNA Removal Kit (Bacteria) from Illumina (San Diego, CA, USA) was used to remove the ribosomal RNA molecules from the isolated total RNA. Removal of rRNA was checked by Agilent RNA Pico 6000 kit on Agilent 2100 Bioanalyzer (Agilent Technologies, Böblingen, Germany). RNA was free of detectable rRNA. Preparation of cDNA libraries were performed according to the manufacturer’s instructions of TruSeq stranded mRNA Kit (Illumina, San Diego, USA). Subsequently, each cDNA library was sequenced on a HiSeq1500 (2 x 75nt PE rapid v2) Sequencer system (Illumina, San Diego, USA).

Dataset Information

Whole track RNAseq of two vector integration mutants of Actinoplanes sp. SE50/110 (pSET152::acbB and pSETT4::acbB).

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