Dataset Information

Genome Sequence of Lignin-Degrading Arthrobacter sp. Strain RT-1, Isolated from Termite Gut and Rumen Fluid.

ABSTRACT: Here, we report the genome sequence of Arthrobacter sp. strain RT-1, isolated from a cocktail of termite gut and rumen fluid. Strain RT-1 degrades a variety of lignin monomers and dimers as the growth substrates. The genome annotation predicted the genes necessary for the catabolism of lignin-derived aromatic compounds.

SUBMITTER: Couger MB

PROVIDER: S-EPMC6965588 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature

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Genome Sequence of Lignin-Degrading Arthrobacter sp. Strain RT-1, Isolated from Termite Gut and Rumen Fluid.

Couger Matthew B MB Graham Caroline C Fathepure Babu Z BZ

Microbiology resource announcements 20200116 3

Here, we report the genome sequence of <i>Arthrobacter</i> sp. strain RT-1, isolated from a cocktail of termite gut and rumen fluid. Strain RT-1 degrades a variety of lignin monomers and dimers as the growth substrates. The genome annotation predicted the genes necessary for the catabolism of lignin-derived aromatic compounds. ...[more]

PMID: 31948970

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Project description:In the cold regions of China, lignin-rich corn straw accumulates at high levels due to low temperatures. The application of psychrotrophic lignin-degrading bacteria should be an effective means of overcoming the low-temperature limit for lignin degradation and promoting the utilization of corn straw. However, this application is limited by the lack of suitable strains for decomposition of lignin; furthermore, the metabolic mechanism of psychrotrophic lignin-degrading bacteria is unclear. Here, the whole genome of the psychrotrophic lignin-degrading bacterium Arthrobacter sp. C2, isolated in our previous work, was sequenced. Comparative genomics revealed that C2 contained unique genes related to lignin degradation and low-temperature adaptability. DyP may participate in lignin degradation and may be a cold-adapted enzyme. Moreover, DyP was proven to catalyze lignin Cα-Cβ bond cleavage. Deletion and complementation of the DyP gene verified its ability to catalyze the first-step reaction of lignin degradation. Comparative transcriptomic analysis revealed that the transcriptional expression of the DyP gene was upregulated, and the genetic compensation mechanism allowed C2ΔDyP to degrade lignin, which provided novel insights into the survival strategy of the psychrotrophic mutant strain C2ΔdyP. This study improved our understanding of the metabolic mechanism of psychrotrophic lignin-degrading bacteria and provided potential application options for energy-saving production using cold-adapted lignin-degrading enzymes. Graphical Abstract The psychrotrophic lignin-degrading Arthrobacter sp. C2 strain exhibited lignin degradation ability and low temperature adaptability. The cold-adapted DyP enzyme of C2 was involved in the catalytic cleavage of lignin Cα-Cβ bonds as a key lignin-degrading enzyme. Comparative transcriptomic analysis showed that the induced transcriptional expression of DyP genes increased on lignin medium, and the mechanism of genetic compensation explained the survival strategy of the mutant strain C2ΔDyP.

Project description:BACKGROUND: Bacteria of the genus Arthrobacter are ubiquitous in soil environments and can be considered as true survivalists. Arthrobacter sp. strain Rue61a is an isolate from sewage sludge able to utilize quinaldine (2-methylquinoline) as sole carbon and energy source. The genome provides insight into the molecular basis of the versatility and robustness of this environmental Arthrobacter strain. RESULTS: The genome of Arthrobacter sp. Rue61a consists of a single circular chromosome of 4,736,495?bp with an average G + C content of 62.32%, the circular 231,551-bp plasmid pARUE232, and the linear 112,992-bp plasmid pARUE113 that was already published. Plasmid pARUE232 is proposed to contribute to the resistance of Arthrobacter sp. Rue61a to arsenate and Pb2+, whereas the linear plasmid confers the ability to convert quinaldine to anthranilate. Remarkably, degradation of anthranilate exclusively proceeds via a CoA-thioester pathway. Apart from quinaldine utilization, strain Rue61a has a limited set of aromatic degradation pathways, enabling the utilization of 4-hydroxy-substituted aromatic carboxylic acids, which are characteristic products of lignin depolymerization, via ortho cleavage of protocatechuate. However, 4-hydroxyphenylacetate degradation likely proceeds via meta cleavage of homoprotocatechuate. The genome of strain Rue61a contains numerous genes associated with osmoprotection, and a high number of genes coding for transporters. It encodes a broad spectrum of enzymes for the uptake and utilization of various sugars and organic nitrogen compounds. A. aurescens TC-1 is the closest sequenced relative of strain Rue61a. CONCLUSIONS: The genome of Arthrobacter sp. Rue61a reflects the saprophytic lifestyle and nutritional versatility of the organism and a strong adaptive potential to environmental stress. The circular plasmid pARUE232 and the linear plasmid pARUE113 contribute to heavy metal resistance and to the ability to degrade quinaldine, respectively.

Project description:Novel bacterial isolates with the capabilities of lignin depolymerization, catabolism, or both, could be pertinent to lignocellulosic biofuel applications. In this study, we aimed to identify anaerobic bacteria that could address the economic challenges faced with microbial-mediated biotechnologies, such as the need for aeration and mixing. Using a consortium seeded from temperate forest soil and enriched under anoxic conditions with organosolv lignin as the sole carbon source, we successfully isolated a novel bacterium, designated 159R. Based on the 16S rRNA gene, the isolate belongs to the genus Sodalis in the family Bruguierivoracaceae. Whole-genome sequencing revealed a genome size of 6.38 Mbp and a GC content of 55 mol%. To resolve the phylogenetic position of 159R, its phylogeny was reconstructed using (i) 16S rRNA genes of its closest relatives, (ii) multilocus sequence analysis (MLSA) of 100 genes, (iii) 49 clusters of orthologous groups (COG) domains, and (iv) 400 conserved proteins. Isolate 159R was closely related to the deadwood associated Sodalis guild rather than the tsetse fly and other insect endosymbiont guilds. Estimated genome-sequence-based digital DNA-DNA hybridization (dDDH), genome percentage of conserved proteins (POCP), and an alignment analysis between 159R and the Sodalis clade species further supported that isolate 159R was part of the Sodalis genus and a strain of Sodalis ligni. We proposed the name Sodalis ligni str. 159R (=DSM 110549 = ATCC TSD-177). IMPORTANCE Currently, in the paper industry, paper mill pulping relies on unsustainable and costly processes to remove lignin from lignocellulosic material. A greener approach is biopulping, which uses microbes and their enzymes to break down lignin. However, there are limitations to biopulping that prevent it from outcompeting other pulping processes, such as requiring constant aeration and mixing. Anaerobic bacteria are a promising alternative source for consolidated depolymerization of lignin and its conversion to valuable by-products. We presented Sodalis ligni str. 159R and its characteristics as another example of potential mechanisms that can be developed for lignocellulosic applications.

Dataset Information

Genome Sequence of Lignin-Degrading Arthrobacter sp. Strain RT-1, Isolated from Termite Gut and Rumen Fluid.

Publications

Genome Sequence of Lignin-Degrading Arthrobacter sp. Strain RT-1, Isolated from Termite Gut and Rumen Fluid.

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