Haku: Desulfovibrio, mecury, (amalgama)
85 articles
Genome insights of mercury methylation among Desulfovibrio and Pseudodesulfovibrio strains.
Goñi-Urriza M, Klopp C, Ranchou-Peyruse M, Ranchou-Peyruse A, Monperrus M, Khalfaoui-Hassani B, Guyoneaud R.
Res Microbiol. 2020 Jan-Feb;171(1):3-12. doi: 10.1016/j.resmic.2019.10.003. Epub 2019 Oct 23.
PMID: 31655199
Mercury methylation converts inorganic mercury into the toxic
methylmercury, and the consequences of this transformation are worrisome
for human health and the environment. This process is performed by
anaerobic microorganisms, such as several strains related to
Pseudodesulfovibrio and Desulfovibrio genera. In order to provide new
insights into the molecular mechanisms of mercury methylation, we
performed a comparative genomic analysis on mercury methylators and
non-methylators from (Pseudo)Desulfovibrio strains. Our results showed
that (Pseudo)Desulfovibrio species are phylogenetically and
metabolically distant and consequently, these genera should be divided
into various genera. Strains able to perform methylation are affiliated
with one branch of the phylogenetic tree, but, except for hgcA and hgcB
genes, no other specific genetic markers were found among methylating
strains. hgcA and hgcB genes can be found adjacent or separated, but
proximity between those genes does not promote higher mercury
methylation. In addition, close examination of the non-methylator
Pseudodesulfovibrio piezophilus C1TLV30 strain, showed a syntenic
structure that suggests a recombination event and may have led to hgcB
depletion. The genomic analyses identify also arsR gene coding for a
putative regulator upstream hgcA. Both genes are cotranscribed
suggesting a role of ArsR in hgcA expression and probably a role in
mercury methylation.
Keywords:
Comparative genomics; Phylogeny; Regulation; Sulfate reducing bacteria; Synteny.
Mercury Uptake by Desulfovibrio desulfuricans ND132: Passive or Active?
An J, Zhang L, Lu X, Pelletier DA, Pierce EM, Johs A, Parks JM, Gu B.
Environ Sci Technol. 2019 Jun 4;53(11):6264-6272. doi: 10.1021/acs.est.9b00047. Epub 2019 May 16.
PMID: 31075193
Recent studies have identified HgcAB proteins as being responsible for mercury
[Hg(II)] methylation by certain anaerobic microorganisms. ...Here, we
examine the dynamics of concurrent Hg(II) adsorption, uptake, and
methylation by both viable and inactivated cells (heat-kil …
Draft Genome Sequence of Desulfovibrio BerOc1, a Mercury-Methylating Strain.
Goñi Urriza M, Gassie C, Bouchez O, Klopp C, Guyoneaud R.
Genome Announc. 2017 Jan 19;5(3):e01483-16. doi: 10.1128/genomeA.01483-16.
PMID: 28104657
Free PMC article.
Desulfovibrio BerOc1 is a sulfate-reducing
bacterium isolated from the Berre lagoon (French Mediterranean coast).
...We identified the hgcA and hgcB genes involved in mercury methylation, but not those responsible for mercury demethylation....
Exposed to Mercury-Induced Oxidative Stress, Changes of Intestinal Microflora, and Association between them in Mice.
Zhao Y, Zhou C, Guo X, Hu G, Li G, Zhuang Y, Cao H, Li L, Xing C, Zhang C, Yang F, Liu P.
Biol Trace Elem Res. 2021 May;199(5):1900-1907. doi: 10.1007/s12011-020-02300-x. Epub 2020 Jul 30.
PMID: 32734533
Review.
Twelve Kunming mice were randomly divided into two groups
(n = 6), and administered with distilled water containing 0 mg/L and 160
mg/L HgCl(2) respectively, with an experimental period of 3 days. Our
results showed that mercury exposure significantly reduced weight gain i …
Mercury methylation by Desulfovibrio desulfuricans ND132 in the presence of polysulfides.
Jay JA, Murray KJ, Gilmour CC, Mason RP, Morel FM, Roberts AL, Hemond HF.
Appl Environ Microbiol. 2002 Nov;68(11):5741-5. doi: 10.1128/AEM.68.11.5741-5745.2002.
PMID: 12406773
Free PMC article.
The extracellular speciation of mercury may control bacterial uptake and methylation. Mercury-polysulfide
complexes have recently been shown to be prevalent in sulfidic waters
containing zero-valent sulfur. Despite substantial increases in total
dissolved mercury …
Cobalamin-mediated mercury methylation by Desulfovibrio desulfuricans LS.
Choi SC, Bartha R.
Appl Environ Microbiol. 1993 Jan;59(1):290-5. doi: 10.1128/aem.59.1.290-295.1993.
PMID: 8439155
Free PMC article.
The prominence of sulfate reducers in mercury biomethylation prompted the examination of the methyl carrier and mercury methylation activity of Desulfovibrio desulfuricans LS. There was a low degree of mercury tolerance and a high degree of methylation …
Carbon Flow in Mercury Biomethylation by Desulfovibrio desulfuricans.
Berman M, Chase T, Bartha R.
Appl Environ Microbiol. 1990 Jan;56(1):298-300. doi: 10.1128/aem.56.1.298-300.1990.
PMID: 16348104
Free PMC article.
Radiocarbon incorporation from pyruvate and serine into monomethylmercury by Desulfovibrio
desulfuricans was consistent with the proposal that the methyl group
originates from C-3 of serine. Immunodiagnostic assays measured 4 to 35
mug of tetrahydrofolate and 58 to 161 ng …
Genome sequence of the mercury-methylating strain Desulfovibrio desulfuricans ND132.
Brown SD, Gilmour CC,
Kucken AM, Wall JD, Elias DA, Brandt CC, Podar M, Chertkov O, Held B,
Bruce DC, Detter JC, Tapia R, Han CS, Goodwin LA, Cheng JF, Pitluck S,
Woyke T, Mikhailova N, Ivanova NN, Han J, Lucas S, Lapidus AL, Land ML,
Hauser LJ, Palumbo AV.
J Bacteriol. 2011 Apr;193(8):2078-9. doi: 10.1128/JB.00170-11. Epub 2011 Feb 25.
PMID: 21357488
Free PMC article.
Desulfovibrio desulfuricans strain ND132 is an
anaerobic sulfate-reducing bacterium (SRB) capable of producing
methylmercury (MeHg), a potent human neurotoxin. ...We present the
3.8-Mb genome sequence to provide further insight into microbial mercury methylation....
Enzymatic catalysis of mercury methylation by Desulfovibrio desulfuricans LS.
Choi SC, Chase T Jr, Bartha R.
Appl Environ Microbiol. 1994 Apr;60(4):1342-6. doi: 10.1128/aem.60.4.1342-1346.1994.
PMID: 8017921
Free PMC article.
The recently defined role of methylcobalamin in Hg2+ methylation by Desulfovibrio
desulfuricans LS enabled us to reexamine the question of whether the
principal source of methylmercury is spontaneous transmethylation or an
enzymatically catalyzed process. ...
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