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Title: Transport capabilities of environmental Pseudomonads for sulfur compounds

Abstract

Sulfur is an essential element in plant rhizospheres and microbial activity plays a key role in increasing the biological availability of sulfur in soil environments. To better understand the mechanisms facilitating the exchange of sulfur-containing molecules in soil, we profiled the binding specificities of eight previously uncharacterized ABC transporter solute-binding proteins from plant-associated Pseudomonads. A high-throughput screening procedure indicated eighteen significant organosulfur binding ligands, with at least one high-quality screening hit for each protein target. Calorimetric and spectroscopic methods were used to validate the best ligand assignments and catalog the thermodynamic properties of the protein-ligand interactions. Two novel high-affinity ligand binding activities were identified and quantified in this set of solute binding proteins. Bacteria were cultured in minimal media with screening library components supplied as the sole sulfur sources, demonstrating that these organosulfur compounds can be metabolized and confirming the relevance of ligand assignments. These results expand the set of experimentally validated ligands amenable to transport by this ABC transporter family and demonstrate the complex range of protein-ligand interactions that can be accomplished by solute-binding proteins. As a result, characterizing new nutrient import pathways provides insight into Pseudomonad metabolic capabilities which can be used to further interrogate bacterial survival andmore » participation in soil and rhizosphere communities.« less

Authors:
 [1];  [1];  [1];  [1]
  1. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1371913
Alternate Identifier(s):
OSTI ID: 1401894
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Protein Science
Additional Journal Information:
Journal Volume: 26; Journal Issue: 4; Journal ID: ISSN 0961-8368
Publisher:
The Protein Society
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; 60 APPLIED LIFE SCIENCES; ABC transporter; Pseudomonas fluorescens; Pseudomonas protegens; organosulfur compounds; rhizosphere

Citation Formats

Zerbs, Sarah, Korajczyk, Peter J., Noirot, Philippe H., and Collart, Frank R. Transport capabilities of environmental Pseudomonads for sulfur compounds. United States: N. p., 2017. Web. doi:10.1002/pro.3124.
Zerbs, Sarah, Korajczyk, Peter J., Noirot, Philippe H., & Collart, Frank R. Transport capabilities of environmental Pseudomonads for sulfur compounds. United States. doi:10.1002/pro.3124.
Zerbs, Sarah, Korajczyk, Peter J., Noirot, Philippe H., and Collart, Frank R. Fri . "Transport capabilities of environmental Pseudomonads for sulfur compounds". United States. doi:10.1002/pro.3124. https://www.osti.gov/servlets/purl/1371913.
@article{osti_1371913,
title = {Transport capabilities of environmental Pseudomonads for sulfur compounds},
author = {Zerbs, Sarah and Korajczyk, Peter J. and Noirot, Philippe H. and Collart, Frank R.},
abstractNote = {Sulfur is an essential element in plant rhizospheres and microbial activity plays a key role in increasing the biological availability of sulfur in soil environments. To better understand the mechanisms facilitating the exchange of sulfur-containing molecules in soil, we profiled the binding specificities of eight previously uncharacterized ABC transporter solute-binding proteins from plant-associated Pseudomonads. A high-throughput screening procedure indicated eighteen significant organosulfur binding ligands, with at least one high-quality screening hit for each protein target. Calorimetric and spectroscopic methods were used to validate the best ligand assignments and catalog the thermodynamic properties of the protein-ligand interactions. Two novel high-affinity ligand binding activities were identified and quantified in this set of solute binding proteins. Bacteria were cultured in minimal media with screening library components supplied as the sole sulfur sources, demonstrating that these organosulfur compounds can be metabolized and confirming the relevance of ligand assignments. These results expand the set of experimentally validated ligands amenable to transport by this ABC transporter family and demonstrate the complex range of protein-ligand interactions that can be accomplished by solute-binding proteins. As a result, characterizing new nutrient import pathways provides insight into Pseudomonad metabolic capabilities which can be used to further interrogate bacterial survival and participation in soil and rhizosphere communities.},
doi = {10.1002/pro.3124},
journal = {Protein Science},
number = 4,
volume = 26,
place = {United States},
year = {2017},
month = {1}
}

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