Chemical Diversity and Biochemical Transformation of Biogenic Organic Sulfur in the Ocean

Tang, Kai

doi:10.3389/fmars.2020.00068

Cited by 28 publications

(18 citation statements)

References 143 publications

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Section: Discussionmentioning

confidence: 99%

“…Organic sulfur compounds are known to be essential for organismal survival, and the sulfur cycle in the ocean has now been well described [ 26 ]. It is also known that high concentrations of organosulfur compounds are produced and stored by micro- and macroalgae [ 26 ]. Sulfation and desulfation reactions, known as the sulfation pathway, modify the variety of secondary metabolites in plants and animals [ 27 ].…”

Section: Discussionmentioning

confidence: 99%

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Targeted and Untargeted Metabolic Profiling to Discover Bioactive Compounds in Seaweeds and Hemp Using Gas and Liquid Chromatography-Mass Spectrometry

et al. 2021

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Greenhouse gas emissions are a global problem facing the dairy/beef industry. Novel feed additives consisting of seaweeds and hemp containing bioactive compounds are theorized to reduce enteric methane emissions. In this study we aimed to investigate the metabolic profiles of brown, red and green seaweeds and hemp using gas chromatography and liquid chromatography mass spectrometry. We used targeted and untargeted approaches, quantifying known halomethanes and phenolics, as well as identifying potentially novel bioactive compounds with anti-methanogenic properties. The main findings were: (a) Asparagopsis taxiformis contained halomethanes, with high concentrations of bromoform (4200 µg/g DW), six volatile halocarbons were tentatively identified; (b) no halomethanes were detected in the other studied seaweeds nor in hemp; (c) high concentrations of lignans were measured in hemp; (d) a high numbers of sulfated phenolic acids and unidentified sulfuric acid-containing compounds were detected in all seaweeds; (e) flavonoid glucosides and glucuronides were mainly identified in hemp; and (f) the condensed tannin gallocatechin was tentatively identified in Fucus sp. Using the combined metabolomics approach, an overview and in-depth information on secondary metabolites were provided. Halomethanes of Asparagopsis sp. have already been shown to be anti-methanogenic; however, metabolic profiles of seaweeds such as Dictyota and Sargassum have also been shown to contain compounds that may have anti-methanogenic potential.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Targeted and Untargeted Metabolic Profiling to Discover Bioactive Compounds in Seaweeds and Hemp Using Gas and Liquid Chromatography-Mass Spectrometry

et al. 2021

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“…These microbes employ a number of organic matter transport systems and degradation pathways to gain energy from the vast array of DOS compounds available in the marine environment. While a great number of DOS compounds exist as reviewed elsewhere (Moran and Durham 2019; Tang 2020), the chemical composition of DOS is roughly defined according to the chemical oxidation state of the organic sulfur containing moiety. More oxidized sulfur metabolites include taurine, and its derivatives, hypotaurine, methyltaurine, isethionate, and N‐acetyltaurine contain a sulfonate moiety

((), {R ‐ SO}_{3}^{-})

; while more reduced forms of DOS, such as dimethylsulfide, contain a methyl‐sulfur

((), {S ‐ R}_{3}^{+})

.…”

Section: Potential For Dos Degradation In Omzsmentioning

confidence: 99%

Sulfur cycling in oceanic oxygen minimum zones

Callbeck

Canfield

Kuypers

et al. 2021

Limnology & Oceanography

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The sulfur cycle is an important, although understudied facet of today's modern oxygen minimum zones (OMZs). Sulfur cycling is most active in highly productive coastal OMZs where sulfide-rich sediments interact with the overlying water column, forming a tightly coupled benthic-pelagic sulfur cycle. In such productive coastal systems, highly eutrophic and anoxic conditions can result in the benthic release of sulfide leading to an intensification of OMZ-shelf biogeochemistry. Active blooms involving a succession of sulfide-oxidizing bacteria detoxify sulfide and reduce nitrate to N 2 , while generating nitrite and ammonium that augment anammox and nitrification. Furthermore, the abiotic interactions of sulfide with trace metals may have the potential to moderate nitrous oxide emissions. While sulfide/sulfur accumulation events were previously considered to be rare, new evidence indicates that events can develop in OMZ shelf waters over prolonged periods of anoxia. The prevalence of these events has ramifications for nitrogen loss and greenhouse gas emissions, including other linked cycles involving carbon and phosphorous. Sulfur-based metabolisms and activity also extend into the offshore OMZ as a result of particle microniches and lateral transport processes. Moreover, OMZ waters ubiquitously host a community of organosulfur-based heterotrophs that ostensibly moderate the turnover of organic sulfur, offering an exciting avenue for future research. Our synthesis highlights the widespread distribution and multifaceted nature of the sulfur cycle in oceanic OMZs.

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“…Dissolved organic sulfur is comprised of 432 identified compounds (Tang 2020), and at least 800 compounds predicted by mass and structure (Ksionzek et al 2016). Dimethylsulfoniopropionate (DMSP) is the most abundant known and quantifiable dissolved organic S species, contributing 2.3% of the minimum estimated marine dissolved organic S (Ksionzek et al 2016) at an average concentration of 1–2 nM (Kiene and Slezak 2006; Levine et al 2016).…”

Section: Figurementioning

confidence: 99%

Sulfur isotope fractionations constrain the biological cycling of dimethylsulfoniopropionate in the upper ocean

Osorio-Rodriguez

Razo-Mejia

Dalleska

et al. 2021

Limnology & Oceanography

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The rapid turnover of dimethylsulfoniopropionate (DMSP), likely the most relevant dissolved organic sulfur compound in the surface ocean, makes it pivotal to understand the cycling of organic sulfur. Dimethylsulfoniopropionate is mainly synthesized by phytoplankton, and it can be utilized as carbon and sulfur sources by marine bacteria or cleaved by bacteria or algae to produce the volatile compound dimethylsulfide (DMS), involved in the formation of sulfate aerosols. The fluxes between the consumption (i.e., demethylation) and cleavage pathways are thought to depend on community interactions and their sulfur demand. However, a quantitative assessment of the sulfur partitioning between each of these pathways is still missing. Here, we report for the first time the sulfur isotope fractionations by enzymes involved in DMSP degradation with different catalytic mechanisms, expressed heterologously in Escherichia coli. We show that the residual DMSP from the demethylation pathway is 2.7‰ enriched in δ 34 S relative to the initial DMSP, and that the fractionation factor ( 34 ε) of the cleavage pathways varies between À1 and À9‰. The incorporation of these fractionation factors into mass balance calculations constrains the biological fates of DMSP in seawater, supports the notion that demethylation dominates over cleavage in marine environments, and could be used as a proxy for the dominant pathways of degradation of DMSP by marine microbial communities.

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Chemical Diversity and Biochemical Transformation of Biogenic Organic Sulfur in the Ocean

Cited by 28 publications

References 143 publications

Targeted and Untargeted Metabolic Profiling to Discover Bioactive Compounds in Seaweeds and Hemp Using Gas and Liquid Chromatography-Mass Spectrometry

Targeted and Untargeted Metabolic Profiling to Discover Bioactive Compounds in Seaweeds and Hemp Using Gas and Liquid Chromatography-Mass Spectrometry

Sulfur cycling in oceanic oxygen minimum zones

Sulfur isotope fractionations constrain the biological cycling of dimethylsulfoniopropionate in the upper ocean

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