Project description:The bacteria that grow on methane aerobically (methanotrophs) support populations of non-methanotrophs in the natural environment by excreting methane-derived carbon. One group of excreted compounds are short-chain organic acids, generated in highest abundance when cultures are grown under O2-starvation. We examined this O2-starvation condition in the methanotroph Methylomicrobium buryatense 5GB1C . Under prolonged O2-starvation in a closed vial, this methanotroph increases the amount of acetate excreted about 10-fold, but the formate, lactate, and succinate excreted do not respond to this culture condition. In bioreactor cultures, the amount of each excreted product is similar across a range of growth rates and limiting substrates, including O2-limitation. A set of mutants were generated in genes predicted to be involved in generating or regulating excretion of these compounds and tested for growth defects, and changes in excretion products. The phenotypes and associated metabolic flux modeling suggested that in M. buryatense 5GB1C, formate and acetate are excreted in response to redox imbalance, and the resulting metabolic state represents a combination of fermentation and respiration metabolism.

2017-08-24 | GSE101981 | GEO

Methylotuvimicrobium buryatense

Project description:OXYGEN-LIMITED METABOLISM IN THE METHANOTROPH METHYLOMICROBIUM BURYATENSE 5GB1C

| PRJNA396065 | ENA

Methylotuvimicrobium buryatense strain:5GB1

Project description:Methylomicrobium buryatense variant resequencing

| PRJNA265098 | ENA

Methylotuvimicrobium buryatense

Project description:Methylomicrobium buryatense overview

| PRJNA89363 | ENA

Methylotuvimicrobium buryatense strain:5GB1C

Project description:Functional genomics of Methylotuvimicrobium buryatense

| PRJNA718747 | ENA

Methylotuvimicrobium buryatense strain:5GB1

Project description:Methylomicrobium buryatense 5GB1 transcriptome, Raw sequence reads

| PRJNA597286 | ENA

A mutagenic screen identifies a TonB-dependent receptor required for the lanthanide metal switch in the Type I methanotroph “Methylotuvimicrobium buryatense” 5GB1C

Project description:Several of the metabolic enzymes in methanotrophic bacteria rely on metals for both their expression and their catalysis. The MxaFI methanol dehydrogenase enzyme complex uses calcium as a cofactor to oxidize methanol, while the alternative methanol dehydrogenase XoxF uses lanthanide metals such as lanthanum and cerium for the same function. Lanthanide metals, abundant in the earth’s crust and widely used in electronic devices, strongly repress the transcription of mxaF yet activate the transcription of xoxF. This phenomenon of mxaF repression and xoxF activation in the presence of lanthanides is called the “lanthanide switch.” To better understand components of the lanthanide switch in the Type I gammaproteobacterial methanotroph “Methylotuvimicrobium buryatense” 5GB1C, we designed a mutagenesis system and selected for mutants unable to repress the mxaF promoter in the presence of lanthanum. Whole genome resequencing for multiple lanthanide switch mutants identified several unique point mutations in a single gene encoding a TonB-dependent receptor, which we have named LanA. While the LanA TonB-dependent receptor is absolutely required for the lanthanide switch, it does not affect lanthanum uptake by the bacterium. Deletion of a separate lanthanide-repressible gene encoding a TonB protein had no effect on the lanthanide switch or on lanthanum uptake. The discovery of this novel component of the lanthanide regulatory system highlights the complexity of this circuit and suggests further components are likely involved.

2019-05-21 | GSE125909 | GEO

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