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Title: Physiological and Comparative Genomic Analysis of Arthrobacter sp. SRS-W-1-2016 Provides Insights on Niche Adaptation for Survival in Uraniferous Soils

Abstract

Arthrobacter sp. strain SRS-W-1-2016 was isolated on high concentrations of uranium (U) from the Savannah River Site (SRS) that remains co-contaminated by radionuclides, heavy metals, and organics. SRS is located on the northeast bank of the Savannah River (South Carolina, USA), which is a U.S. Department of Energy (DOE) managed ecosystem left historically contaminated from decades of nuclear weapons production activities. Predominant contaminants within the impacted SRS environment include U and Nickel (Ni), both of which can be transformed microbially into less toxic forms via metal complexation mechanisms. Strain SRS-W-1-2016 was isolated from the uraniferous SRS soils on high concentrations of U (4200 μM) and Ni (8500 μM), but rapid growth was observed at much lower concentrations of 500 μM U and 1000 μM Ni, respectively. Microcosm studies established with strain SRS-W-1-2016 revealed a rapid decline in the concentration of spiked U such that it was almost undetectable in the supernatant by 72 h of incubation. Conversely, Ni concentrations remained unchanged, suggesting that the strain removed U but not Ni under the tested conditions. To obtain a deeper understanding of the metabolic potential, a draft genome sequence of strain SRS-W-1-2016 was obtained at a coverage of 90×, assembling into 93more » contigs with an N50 contig length of 92,788 bases. The genomic size of strain SRS-W-1-2016 was found to be 4,564,701 bases with a total number of 4327 putative genes. An in-depth, genome-wide comparison between strain SRS-W-1-2016 and its four closest taxonomic relatives revealed 1159 distinct genes, representing 26.7% of its total genome; many associating with metal resistance proteins (e.g., for cadmium, cobalt, and zinc), transporter proteins, stress proteins, cytochromes, and drug resistance functions. Additionally, several gene homologues coding for resistance to metals were identified in the strain, such as outer membrane efflux pump proteins, peptide/nickel transport substrate and ATP-binding proteins, a high-affinity nickel-transport protein, and the spoT gene, which was recently implicated in bacterial resistance towards U. Detailed genome mining analysis of strain SRS-W-1-2016 also revealed the presence of a plethora of secondary metabolite biosynthetic gene clusters likely facilitating resistance to antibiotics, biocides, and metals. Additionally, several gene homologous for the well-known oxygenase enzyme system were also identified, potentially functioning to generate energy via the breakdown of organic compounds and thus enabling the successful colonization and natural attenuation of contaminants by Arthrobacter sp. SRS-W-1-2016 at the SRS site.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [3];  [4];  [5];  [6]
  1. Florida A&M Univ., Tallahassee, FL (United States). Environmental Biotechnology and Genomics Lab., School of the Environment
  2. Florida A&M Univ., Tallahassee, FL (United States). Dept. of Biology, College of Science and Technology
  3. Alabama State Univ., Montgomery, AL (United States). Dept. of Biological Sciences
  4. Arizona State Univ., Tempe, AZ (United States). School of Life Sciences, College of Liberal Arts and Sciences
  5. Univ. of Alberta, Edmonton, AB (Canada). Dept. of Agricultural, Food and Nutritional Science
  6. Univ. of Georgia, Athens, GA (United States); Savannah River Site (SRS), Aiken, SC (United States). Savannah River Ecology Lab. (SREL)
Publication Date:
Research Org.:
Univ. of Georgia, Athens, GA (United States); Savannah River Nuclear Solutions (SRNS), Aiken, SC (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1510970
Grant/Contract Number:  
EM0004391; AC09-08SR22470
Resource Type:
Accepted Manuscript
Journal Name:
Genes
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2073-4425
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; bioremediation; uranium; nickel; whole genome sequencing; resistome; comparative genomics; Arthrobacter

Citation Formats

Chauhan, Ashvini, Pathak, Ashish, Jaswal, Rajneesh, Edwards III, Bobby, Chappell, Demario, Ball, Christopher, Garcia-Sillas, Reyna, Stothard, Paul, and Seaman, John. Physiological and Comparative Genomic Analysis of Arthrobacter sp. SRS-W-1-2016 Provides Insights on Niche Adaptation for Survival in Uraniferous Soils. United States: N. p., 2018. Web. doi:10.3390/genes9010031.
Chauhan, Ashvini, Pathak, Ashish, Jaswal, Rajneesh, Edwards III, Bobby, Chappell, Demario, Ball, Christopher, Garcia-Sillas, Reyna, Stothard, Paul, & Seaman, John. Physiological and Comparative Genomic Analysis of Arthrobacter sp. SRS-W-1-2016 Provides Insights on Niche Adaptation for Survival in Uraniferous Soils. United States. https://doi.org/10.3390/genes9010031
Chauhan, Ashvini, Pathak, Ashish, Jaswal, Rajneesh, Edwards III, Bobby, Chappell, Demario, Ball, Christopher, Garcia-Sillas, Reyna, Stothard, Paul, and Seaman, John. Thu . "Physiological and Comparative Genomic Analysis of Arthrobacter sp. SRS-W-1-2016 Provides Insights on Niche Adaptation for Survival in Uraniferous Soils". United States. https://doi.org/10.3390/genes9010031. https://www.osti.gov/servlets/purl/1510970.
@article{osti_1510970,
title = {Physiological and Comparative Genomic Analysis of Arthrobacter sp. SRS-W-1-2016 Provides Insights on Niche Adaptation for Survival in Uraniferous Soils},
author = {Chauhan, Ashvini and Pathak, Ashish and Jaswal, Rajneesh and Edwards III, Bobby and Chappell, Demario and Ball, Christopher and Garcia-Sillas, Reyna and Stothard, Paul and Seaman, John},
abstractNote = {Arthrobacter sp. strain SRS-W-1-2016 was isolated on high concentrations of uranium (U) from the Savannah River Site (SRS) that remains co-contaminated by radionuclides, heavy metals, and organics. SRS is located on the northeast bank of the Savannah River (South Carolina, USA), which is a U.S. Department of Energy (DOE) managed ecosystem left historically contaminated from decades of nuclear weapons production activities. Predominant contaminants within the impacted SRS environment include U and Nickel (Ni), both of which can be transformed microbially into less toxic forms via metal complexation mechanisms. Strain SRS-W-1-2016 was isolated from the uraniferous SRS soils on high concentrations of U (4200 μM) and Ni (8500 μM), but rapid growth was observed at much lower concentrations of 500 μM U and 1000 μM Ni, respectively. Microcosm studies established with strain SRS-W-1-2016 revealed a rapid decline in the concentration of spiked U such that it was almost undetectable in the supernatant by 72 h of incubation. Conversely, Ni concentrations remained unchanged, suggesting that the strain removed U but not Ni under the tested conditions. To obtain a deeper understanding of the metabolic potential, a draft genome sequence of strain SRS-W-1-2016 was obtained at a coverage of 90×, assembling into 93 contigs with an N50 contig length of 92,788 bases. The genomic size of strain SRS-W-1-2016 was found to be 4,564,701 bases with a total number of 4327 putative genes. An in-depth, genome-wide comparison between strain SRS-W-1-2016 and its four closest taxonomic relatives revealed 1159 distinct genes, representing 26.7% of its total genome; many associating with metal resistance proteins (e.g., for cadmium, cobalt, and zinc), transporter proteins, stress proteins, cytochromes, and drug resistance functions. Additionally, several gene homologues coding for resistance to metals were identified in the strain, such as outer membrane efflux pump proteins, peptide/nickel transport substrate and ATP-binding proteins, a high-affinity nickel-transport protein, and the spoT gene, which was recently implicated in bacterial resistance towards U. Detailed genome mining analysis of strain SRS-W-1-2016 also revealed the presence of a plethora of secondary metabolite biosynthetic gene clusters likely facilitating resistance to antibiotics, biocides, and metals. Additionally, several gene homologous for the well-known oxygenase enzyme system were also identified, potentially functioning to generate energy via the breakdown of organic compounds and thus enabling the successful colonization and natural attenuation of contaminants by Arthrobacter sp. SRS-W-1-2016 at the SRS site.},
doi = {10.3390/genes9010031},
journal = {Genes},
number = 1,
volume = 9,
place = {United States},
year = {Thu Jan 11 00:00:00 EST 2018},
month = {Thu Jan 11 00:00:00 EST 2018}
}

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