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SRX23772447: GSM8114836: Glucose Rep 2; Novosphingobium aromaticivorans DSM 12444; RNA-Seq
1 ILLUMINA (Illumina NovaSeq 6000) run: 8.5M spots, 2.6G bases, 743.3Mb downloads

External Id: GSM8114836_r1
Submitted by: Great Lakes Bioenergy Research Center, University of Wisconsin - Madison
Study: Catabolism of b-5 linked aromatics by Novosphingobium aromaticivorans
show Abstracthide Abstract
Aromatic compounds are an important renewable source of commodity chemicals traditionally produced from fossil fuels. Aromatics derived from plant lignin can potentially be converted into commodity chemicals through depolymerization followed by microbial funneling of monomers and low molecular weight oligomers. This study investigates the catabolism of the b-5 linked aromatic dimer dehydrodiconiferyl alcohol (DC-A) by the bacterium Novosphingobium aromaticivorans. We used genome wide screens to identify candidate genes involved in DC-A catabolism. Subsequent in vivo and in vitro analyses of these candidates elucidated a catabolic pathway composed of four required gene products and several partially redundant dehydrogenases that convert DC-A to aromatic monomers that can be funneled into the central aromatic metabolic pathway of N. aromaticivorans. Specifically, a newly identified ?-formaldehyde lyase, PcfL, opens the phenylcoumaran ring to form a stilbene and formaldehyde. A lignostilbene dioxygenase, LsdD, then cleaves the stilbene to generate the aromatic monomers, vanillin and 5-formylferulate (5-FF). We also show that an aldehyde dehydrogenase FerD oxidizes 5-FF before it is decarboxylated by LigW, yielding ferulic acid. We found that some enzymes involved in b-5 catabolism pathway can act on multiple substrates and that some steps in the pathway can be mediated by multiple enzymes, providing new insights into the robust flexibility of aromatic catabolism in N. aromaticivorans. We performed a comparative genomic analysis to predict that key enzymes in the newly discovered b-5 aromatic catabolic pathway are common among Sphingomonads. Overall design: RNA-seq comparison of transcript abundance in a PDC-producing N. aromaticivorans strain (12444PDC) grown in the presence of dehydrodiconiferyl alcohol (DC-A) and glucose, vanillin and glucose, ferulic acid and glucose, or glucose alone
Sample: Glucose Rep 2
SAMN40180188 • SRS20597878 • All experiments • All runs
Library:
Name: GSM8114836
Instrument: Illumina NovaSeq 6000
Strategy: RNA-Seq
Source: TRANSCRIPTOMIC
Selection: cDNA
Layout: PAIRED
Construction protocol: The cells were pelleted by centrifugation (4,300 x g for 10 minutes) at 4°C and stored at -80°C. Cell pellets were resuspended in 2 mL of lysis solution (2% sodium dodecyl sulfate, 16mM EDTA, RNase-free water) and heated at 65°C for 5 minutes. Nucleic acids were extracted using 2 mL of acidic phenol:chloroform heated to 65°C, mixed by inversion, incubated at 65°C for 5 minutes, and centrifuged at room temperature for 7 minutes at 20,000 x g. The aqueous phase was removed, extracted twice more, before addition of 2 mL of chloroform, mixed, and centrifuged once more at room temperature for 7 minutes at 20,000 x g. The aqueous layer was removed and mixed with 1/10 volume of 3M sodium acetate and equal volume of isopropanol, and incubated at -20°C for >1 hour to precipitate nucleic acids that were collected by centrifugation at 4°C for 30 minutes at 16,000 x g. The pellet was washed twice with 1 mL of 75% EtOH (prepared with RNase-free water). Once residual ethanol was removed by evaporation, the pellet was resuspended in 85 μL of RNase-free water. Samples were treated with RNase-free DNase (10 μL 10x DNase buffer, 2 μL DNase, 3 μL RNasin (Promega)) and purified using RNeasy kit (Qiagen). RNA-seq library preparation and sequencing was performed by the Joint Genome Institute (JGI) using default parameters. rRNA in the samples was depleted using the QIAseq FastSelect kit (Qiagen, Germantown, MD). Libraries were constructed using the TruSeq stranded mRNA kit (Illumina) following standard JGI protocols.
Runs: 1 run, 8.5M spots, 2.6G bases, 743.3Mb
Run# of Spots# of BasesSizePublished
SRR281288818,504,4002.6G743.3Mb2024-02-29

ID:
32065215

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