U.S. flag

An official website of the United States government

Format

Send to:

Choose Destination

Links from BioSample

SRX17683233: GSM6598762: WT_2; Actinobacillus pleuropneumoniae; RNA-Seq
1 ILLUMINA (Illumina NovaSeq 6000) run: 6.6M spots, 2G bases, 584.6Mb downloads

External Id: GSM6598762_r1
Submitted by: State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University
Study: CpxAR of Actinobacillus pleuropneumoniae Contributes to Heat Stress Response by Repressing Expression of Type IV Pilus Gene apfA
show Abstracthide Abstract
Acute pleuropneumonia in swine, caused by Actinobacillus pleuropneumoniae (APP), is characterized by a high and sustained fever. Fever creates an adverse environment for many bacteria leading to reduced bacterial proliferation; however, most pathogenic bacteria can tolerate higher temperatures. CpxAR is a two-component regulation system, ubiquitous among Gram-negative bacteria, which senses and responds to envelope alterations that are mostly associated with protein misfolding in the periplasm. Our previous study showed that CpxAR is necessary for the optimal growth of Actinobacillus pleuropneumoniae (APP) under heat stress. Here, we showed that mutation of the type IV pilin gene apfA rescued the growth defect of the cpxAR deletion strain under heat stress. RNA-seq analyses revealed that 265 genes were differentially expressed in the ?cpxAR strains grown at 42°C, including genes involved in type IV pilus biosynthesis. We also demonstrated direct binding of the CpxR protein to the promoter of the apf operon by an electrophoretic mobility shift assay, and identified the binding site by a DNase I footprinting assay. In conclusion, our results revealed the important role of CpxAR in APP resistance to heat stress by directly suppressing the expression of ApfA. Overall design: To investigate the role of CpxAR in the fever-like temperature-resistance of APP, we performed RNA-seq analysis to compare the transcriptome of the cpxAR mutant with that of the wild-type (WT) strain grown under heat stress.
Sample: WT_2
SAMN30988582 • SRS15214873 • All experiments • All runs
Library:
Name: GSM6598762
Instrument: Illumina NovaSeq 6000
Strategy: RNA-Seq
Source: TRANSCRIPTOMIC
Selection: cDNA
Layout: PAIRED
Construction protocol: The WT (S4074) and ∆cpxAR mutant strains were grown in TSB overnight, then transferred (at a 1:1000 dilution) into fresh medium and grown to an OD600 of 0.6 at 37°C or 42°C. Total RNA was extracted from the bacterial solution using a Bacteria Total RNA Isolation Kit (Sangon Biotech, China) following the manufacturer's protocol. Total RNA was used as input material for the RNA sample preparations. For prokaryotic samples, mRNA was purified from total RNA using probes to remove rRNA. Fragmentation was carried out using divalent cations under elevated temperature in First Strand Synthesis Reaction Buffer(5X). First strand cDNA was synthesized using random hexamer primer and M-MuLV Reverse Transcriptase, then use RNaseH to degrade the RNA. And in the DNA polymerase I system, use dUTP to replace the dNTP of dTTP as the raw material to synthesize the second strand of cDNA. Remaining overhangs were converted into blunt ends via exonuclease/polymerase activities. After adenylation of 3' ends of DNA fragments, Adaptor with hairpin loop structure were ligated to prepare for hybridization. Then USER Enzyme was used to degrade the second strand of cDNA containing U, In order to select cDNA fragments of preferentially 370~420 bp in length, the library fragments were purified with AMPure XP system (Beckman Coulter, Beverly, USA). Then PCR was performed with Phusion High-Fidelity DNA polymerase, Universal PCR primers and Index (X) Primer. At last, PCR products were purified (AMPure XP system) and library quality was assessed on the Agilent Bioanalyzer 2100 system.
Runs: 1 run, 6.6M spots, 2G bases, 584.6Mb
Run# of Spots# of BasesSizePublished
SRR216854696,637,1912G584.6Mb2022-09-28

ID:
24583266

Supplemental Content

Recent activity

Your browsing activity is empty.

Activity recording is turned off.

Turn recording back on

See more...