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The corrinoid cofactor of reductive dehalogenases affects dechlorination rates and extents in organohalide-respiring Dehalococcoides mccartyi

Journal Article · · The ISME Journal
 [1];  [2];  [2];  [2];  [2];  [2];  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
Corrinoid auxotrophic organohalide-respiring Dehalococcoides mccartyi (Dhc) strains are keystone bacteria for reductive dechlorination of toxic and carcinogenic chloroorganic contaminants. We demonstrate that the lower base attached to the essential corrinoid cofactor of reductive dehalogenase (RDase) enzyme systems modulates dechlorination activity and affects the vinyl chloride (VC) RDases BvcA and VcrA differently. Amendment of 5,6-dimethylbenzimidazolyl-cobamide (DMB-Cba) to Dhc strain BAV1 and strain GT cultures supported cis-1,2-dichloroethene-to-ethene reductive dechlorination at rates of 107.0 (±12.0) μM and 67.4 (±1.4) μM Cl- released per day, respectively. Strain BAV1, expressing the BvcA RDase, reductively dechlorinated VC to ethene, although at up to fivefold lower rates in cultures amended with cobamides carrying 5-methylbenzimidazole (5-MeBza), 5-methoxybenzimidazole (5-OMeBza) or benzimidazole (Bza) as the lower base. In contrast, strain GT harboring the VcrA RDase failed to grow and dechlorinate VC to ethene in medium amended with 5-OMeBza-Cba or Bza-Cba. The amendment with DMB to inactive strain GT cultures restored the VC-to-ethene-dechlorinating phenotype and intracellular DMB-Cba was produced, demonstrating cobamide uptake and remodeling. The distinct responses of Dhc strains with BvcA versus VcrA RDases to different cobamides implicate that the lower base exerts control over Dhc reductive dechlorination rates and extents (that is, detoxification), and therefore the dynamics of Dhc strains with discrete reductive dechlorination capabilities. Furthermore, these findings emphasize that the role of the corrinoid/lower base synthesizing community must be understood to predict strain-specific Dhc activity and achieve efficacious contaminated site cleanup.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1468287
Journal Information:
The ISME Journal, Journal Name: The ISME Journal Journal Issue: 5 Vol. 10; ISSN 1751-7362
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (16)

Purinyl-cobamide is a native prosthetic group of reductive dehalogenases journal November 2017
Targeted detection of Dehalococcoides mccartyi microbial protein biomarkers as indicators of reductive dechlorination activity in contaminated groundwater journal July 2019
Identification and characterization of a bacterial core methionine synthase journal February 2020
Cobalamin Protection against Oxidative Stress in the Acidophilic Iron-oxidizing Bacterium Leptospirillum Group II CF-1 journal May 2016
Sustained Dechlorination of Vinyl Chloride to Ethene in Dehalococcoides -Enriched Cultures Grown without Addition of Exogenous Vitamins and at Low pH journal August 2019
Refined experimental annotation reveals conserved corrinoid autotrophy in chloroform-respiring Dehalobacter isolates journal November 2016
Grape pomace compost harbors organohalide-respiring Dehalogenimonas species with novel reductive dehalogenase genes journal August 2017
Uneven distribution of cobamide biosynthesis and dependence in bacteria predicted by comparative genomics journal November 2018
Impact of iron- and/or sulfate-reduction on a cis -1,2-dichloroethene and vinyl chloride respiring bacterial consortium: experiments and model-based interpretation journal January 2020
An integrative overview of genomic, transcriptomic and proteomic analyses in organohalide respiration research journal January 2018
Organohalide respiratory chains: composition, topology and key enzymes journal March 2018
Sustained dechlorination of vinyl chloride to ethene in Dehalococcoides-enriched cultures grown without addition of exogenous vitamins and at low pH posted_content April 2019
Cofactor selectivity in methylmalonyl-CoA mutase, a model cobamide-dependent enzyme posted_content May 2019
Guided cobamide biosynthesis for heterologous production of reductive dehalogenases journal December 2018
Selective Utilization of Benzimidazolyl-Norcobamides as Cofactors by the Tetrachloroethene Reductive Dehalogenase of Sulfurospirillum multivorans journal January 2018
Transient O2 pulses direct Fe crystallinity and Fe(III)-reducer gene expression within a soil microbiome journal October 2018

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