Title: Proteogenomic Analysis of Burkholderia Species Strains 25 and 46 Isolated from Uraniferous Soils Reveals Multiple Mechanisms to Cope with Uranium Stress

Abstract

Two Burkholderia spp. (strains SRS-25 and SRS-46) were isolated from high concentrations of uranium (U) from the U.S. Department of Energy (DOE)-managed Savannah River Site (SRS). SRS contains soil gradients that remain co-contaminated by heavy metals from previous nuclear weapons production activities. Uranium (U) is one of the dominant contaminants within the SRS impacted soils, which can be microbially transformed into less toxic forms. We established microcosms containing strains SRS-25 and SRS-46 spiked with U and evaluated the microbially-mediated depletion with concomitant genomic and proteomic analysis. Both strains showed a rapid depletion of U; draft genome sequences revealed SRS-25 genome to be of approximately 8,152,324 bp, a G + C content of 66.5, containing a total 7604 coding sequences with 77 total RNA genes. Similarly, strain SRS-46 contained a genome size of 8,587,429 bp with a G + C content of 67.1, 7895 coding sequences, with 73 total RNA genes, respectively. An in-depth, genome-wide comparisons between strains 25, 46 and a previously isolated strain from our research (Burkholderia sp. strain SRS-W-2-2016), revealed a common pool of 3128 genes; many were found to be homologues to previously characterized metal resistance genes (e.g., for cadmium, cobalt, and zinc), as well as formore » transporter, stress/detoxification, cytochromes, and drug resistance functions. Furthermore, proteomic analysis of strains with or without U stress, revealed the increased expression of 34 proteins from strain SRS-25 and 52 proteins from strain SRS-46; similar to the genomic analyses, many of these proteins have previously been shown to function in stress response, DNA repair, protein biosynthesis and metabolism. Overall, this comparative proteogenomics study confirms the repertoire of metabolic and stress response functions likely rendering the ecological competitiveness to the isolated strains for colonization and survival in the heavy metals contaminated SRS soil habitat.« less

Authors:

Agarwal, Meenakshi; Pathak, Ashish; Rathore, Rajesh; Prakash, Om; Singh, Rakesh; Jaswal, Rajneesh; Seaman, John; Chauhan, Ashvini

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Publication Date:

Wed Dec 12 00:00:00 EST 2018

Research Org.:

Univ. of Georgia, Athens, GA (United States); Savannah River Nuclear Solutions (SRNS), Aiken, SC (United States)

Sponsoring Org.:

USDOE Office of Environmental Management (EM)

OSTI Identifier:

1485520

Alternate Identifier(s):

OSTI ID: 1614656

Grant/Contract Number:  

AC09-08SR22470; EM0004391

Resource Type:

Published Article

Journal Name:

Cells

Additional Journal Information:

Journal Name: Cells Journal Volume: 7 Journal Issue: 12; Journal ID: ISSN 2073-4409

Publisher:

MDPI

Country of Publication:

Switzerland

Language:

English

Subject:

59 BASIC BIOLOGICAL SCIENCES; Cell Biology