Analysis of the genes involved in thiocyanate oxidation during growth in continuous culture of the haloalkaliphilic sulfur-oxidizing bacterium Thioalkalivibrio thiocyanoxidans ARh 2T using transcriptomics

Analysis of the genes involved in thiocyanate oxidation during growth in continuous culture of the haloalkaliphilic sulfur-oxidizing bacterium Thioalkalivibrio thiocyanoxidans ARh 2T using transcriptomics

Berben, Tom (Vrije Universiteit Amsterdam)
Balkema, Cherel (Vrije Universiteit Amsterdam)
Sorokin, Dimitry Y. (TU Delft BT/Environmental Biotechnology; Russian Academy of Sciences)
Muyzer, Gerard (Vrije Universiteit Amsterdam)

2017-11-01

Thiocyanate (N=C-S-) is a moderately toxic, inorganic sulfur compound. It occurs naturally as a by-product of the degradation of glucosinolatecontaining plants and is produced industrially in a number of mining processes. Currently, two pathways for the primary degradation of thiocyanate in bacteria are recognized, the carbonyl sulfide pathway and the cyanate pathway, of which only the former has been fully characterized. Use of the cyanate pathway has been shown in only 10 strains of Thioalkalivibrio, a genus of obligately haloalkaliphilic sulfuroxidizing Gammaproteobacteria found in soda lakes. So far, only the key enzyme in this reaction, thiocyanate dehydrogenase (TcDH), has been purified and studied. To gain a better understanding of the other genes involved in the cyanate pathway, we conducted a transcriptomics experiment comparing gene expression during the growth of Thioalkalivibrio thiocyanoxidans ARh 2T with thiosulfate with that during its growth with thiocyanate. Triplicate cultures were grown in continuous substratelimited mode, followed by transcriptome sequencing (RNA-Seq) of the total mRNA. Differential expression analysis showed that a cluster of genes surrounding the gene for TcDH were strongly upregulated during growth with thiocyanate. This cluster includes genes for putative copper uptake systems (copCD, ABC-type transporters), a putative electron acceptor (fccAB), and a two-component regulatory system (histidine kinase and a σ54-responsive Fis family transcriptional regulator). Additionally, we observed the increased expression of RuBisCO and some carboxysome shell genes involved in inorganic carbon fixation, as well as of aprAB, genes involved in sulfite oxidation through the reverse sulfidogenesis pathway.

Chemolithoautotrophs
Chemostat
RNA-Seq
Soda lakes
Thioalkalivibrio
Thiocyanate
Thiocyanate dehydrogenase

http://resolver.tudelft.nl/uuid:0adaf17e-c1b7-47f4-a20c-61a581abe219

https://doi.org/10.1128/mSystems.00102-17

mSystems, 2 (6)

Institutional Repository

journal article

© 2017 Tom Berben, Cherel Balkema, Dimitry Y. Sorokin, Gerard Muyzer