Abstract
Microbial dimethyl sulfide (DMS) conversion is thought to be involved in the global sulfur cycle. We isolated Pseudomonas putida strain DS1 from soil as a bacterium utilizing DMS as a sole sulfur source, and tried to elucidate the DMS conversion mechanism of strain DS1 at biochemical and genetic level. Strain DS1 oxidized DMS to dimethyl sulfone (DMSO2) via dimethyl sulfoxide, whereas the oxidation was repressed in the presence of sulfate, suggesting that a sulfate starvation response is involved in DMS utilization by strain DS1. Two of the five DMS-utilization-defective mutants isolated by transposon5 (Tn5) mutagenesis had a Tn5 insertion in the ssuEADCBF operon, which has been reported to encode a two-component monooxygenase system (SsuED), an ABC-type transporter (SsuABC), and a small protein (SsuF), and also to play a key role in utilization of sulfonates and sulfate esters in another bacterium, P. putida strain S-313. Disruption of ssuD and SsuD enzymatic activity demonstrated that methanesulfonate is a metabolic intermediate of DMS and desulfonated by SsuD. Disruption of ssuC or ssuF also led to a DMS-utilization-defective phenotype. Another two mutants had a defect in a gene homologous to pa2354 from P. aeruginosa PAO1, which encodes a putative transcriptional regulator, while the remaining mutant had a defect in cysM encoding O-acetylserine (thiol)-lyase B.
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This work was supported in part by a Grant-in-Aid for Scientific Research (No. 14360050) to T. O. from the Ministry of Education, Science, Sports and Culture of Japan.
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Endoh, T., Kasuga, K., Horinouchi, M. et al. Characterization and identification of genes essential for dimethyl sulfide utilization in Pseudomonas putida strain DS1. Appl Microbiol Biotechnol 62, 83–91 (2003). https://doi.org/10.1007/s00253-003-1233-7
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DOI: https://doi.org/10.1007/s00253-003-1233-7