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Characterization of the electron-accepting part of the organohalide respiration chain of Dehalobacter and Desulfitobacterium

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Properties of Enzymes Involved in Tetrachloroethene Respiration

Géraldine Florence Buttet

Tetrachloroethene (PCE) pollution threatens nature and human health due to its toxic and carcinogenic potential. Due to industrial activities, large amounts of PCE were discharged into the environment over the last decades and represent one of major ground ...

EPFL2017

Reductive dehalogenases (rdhA, RDases) are key enzymes involved in anaerobic organohalide respiration (OHR), during which bacteria are able to use chlorinated compounds as terminal electron acceptors. RDases are redox enzymes containing FeS clusters and a ...

2016

Dehalobacter – a genus of anaerobic bacteria dedicated to organohalide degradation

Christof Holliger, Julien Maillard

Abstract The genus Dehalobacter embraces bacterial populations that seem to exclusively degrade organohalides. All isolates in pure culture and highly enriched strains are obligate organohalide-respiring bacteria that use hydrogen as energy and electron so ...

Springer-Verlag2016

FOLDING OF COMPLEX REDOX PROTEINS BY DEDICATED MOLECULAR CHAPERONES

Julien Maillard, Ziad Julier, Corantin Grob

Chlorinated compounds (so-called organohalides) are widespread soil and groundwater pollutants. Only few bacteria have the ability to degrade these compounds via organohalide respiration (OHR). Reductive dehalogenases (RDases) are complex redox enzymes inv ...

2016

On the Analysis of Non-stationary Impedance Spectra

Alberto Battistel

In this work we study the possibility to analyze the non-stationary impedance spectra by employing standard equivalent circuits. For this purpose, the dynamic multi-frequency analysis (DMFA) is introduced and compared with a set of consecutive stationary i ...

Wiley-Blackwell2016

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It was recently demonstrated that in ferric myoglobins (Mb) the fluorescence quenching of the photoexcited tryptophan 14 (*Trp(14)) residue is in part due to an electron transfer to the heme porphyrin (porph), turning it to the ferrous state. However, the ...

National Academy of Sciences2015

Functional diversity of reductive dehalogenases in a bacterial consortium degrading chloroethenes

Christof Holliger, Julien Maillard, Géraldine Florence Buttet, Sébastien Keller

Chlorinated hydrocarbon pollution threatens nature and human health due to its toxic and carcinogenic potential. Enrichment cultures were investigated for the bioremediation potential of tetrachloroethene (PCE). This process is based on bacterial anaerobic ...

2014

The genera Desulfotomaculum and Clostridium, belonging to the phylum Firmicutes, comprise Gram-positive, low G+C genomic content, anaerobic, spore- forming bacteria. Desulfotomaculum is a metabolically and environmentally versatile genus capable of growing ...

EPFL2014

Proteome analysis of the response of Dehalobacter restrictus to cobalamin starvation

Christof Holliger, Julien Maillard, Aamani Rupakula Boyanapalli, Hauke Smidt

Dehalobacter restrictus strain PER-K23 is an obligate organohalide respiring microorganism known to solely use tetra- or trichloroethene as electron acceptors with H2 as electron donor. The catalytic enzyme, PceA, contains a corrinoid as cofactor, a trait ...

2014

Characterization of the metallo-cofactors of the tetrachloroethene reductive dehalogenase purified from Sulfurospirillum multivorans

Sulfurospirillum multivorans is an epsilonproteobacterium able to grow anaerobically with hydrogen as electron donor and tetrachloroethene (PCE) as terminal electron acceptor (organohalide respiration). The dechlorination is mediated by the PCE reductive d ...

2013