Hydroxamate siderophore-promoted reactions between iron(II) and nitroaromatic groundwater contaminants

Kim, Dongwook; Duckworth, Owen W.; Strathmann, Timothy J.

doi:10.1016/j.gca.2008.11.039

Cited by 49 publications

(45 citation statements)

References 74 publications

(117 reference statements)

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“…1), which is a surrogate for a metal ion's hardness (Duckworth et al 2009bHernlem et al 1999;Hider 1984). The difficulty in overcoming this trend in affinity in favor of a target metal is illustrated by the Table 1 Selected logb for a selection of metallophores with diverse metal ions Anderegg et al 1963;Bellenger et al 2007;Buglyo et al 1995;Carrano et al 1996;Choi et al 2006;Duckworth et al 2009c;Duckworth and Sposito 2005b;Enyedy et al 2004;Evers et al 1989;Farkas et al 2003;Harrington et al 2012b;Hernlem et al 1996;Jarvis and Hancock 1991;Kim et al 2009;Murakami et al 1989;Pesch et al 2012;Shenker et al 1996;Szabo and Farkas 2011;Whisenhunt et al 1996;Yoshimura et al 2011 …”

Section: Structural Factors Controlling Metallophore Complexation Of mentioning

confidence: 99%

“…HDFOB 2-n complexes (Duckworth et al 2009bHernlem et al 1999;Hider 1984). Literature stability constant (Anderegg et al 1963;Buglyo et al 1995;Duckworth et al 2009c;Duckworth and Sposito 2005b;Evers et al 1989;Hernlem et al 1996;Jarvis and Hancock 1991;Kim et al 2009;Whisenhunt et al 1996) Aquat Geochem groups and metal ions with more members in the chelate ring will be better able to interact with smaller metal ions. Thus, six-membered chelate rings such as those seen in citrate are well suited for binding smaller metal ions such as Fe (IR B 0.6 Å ).…”

Section: Structural Factors Controlling Metallophore Complexation Of mentioning

confidence: 99%

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Metallophores and Trace Metal Biogeochemistry

et al. 2014

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Trace metal limitation not only affects the biological function of organisms, but also the health of ecosystems and the global cycling of elements. The enzymatic machinery of microbes helps to drive critical biogeochemical cycles at the macroscale, and in many cases, the function of metalloenzyme-mediated processes may be limited by the scarcity of essential trace metals. In response to these nutrient limitations, some organisms employ a strategy of exuding metallophores, biogenic ligands that facilitate the uptake of metal ions. For example, bacterial, fungal, and graminaceous plant species are known to use Fe(III)-binding siderophores for nutrient acquisition, providing the best known and most thoroughly studied example of metallophores. However, recent breakthroughs have suggested or established the role of metallophores in the uptake of several other metallic nutrients. Furthermore, these metallophores may influence environmental trace metal fate and transport beyond nutrient acquisition. These discoveries have resulted in a deeper understanding of trace metal geochemistry and its relationship to the cycling of carbon and nitrogen in natural systems. In this review, we provide an overview of the current state of knowledge on the biogeochemistry of metallophores in trace metal acquisition, and explore established and potential metallophore systems.Electronic supplementary material The online version of this article (

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Section: Structural Factors Controlling Metallophore Complexation Of mentioning

confidence: 99%

Section: Structural Factors Controlling Metallophore Complexation Of mentioning

confidence: 99%

Metallophores and Trace Metal Biogeochemistry

et al. 2014

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“…In addition to what is imparted by multidentate binding, the stability of Fe(III)-siderophore complexes is rationalized by noting that the hard oxygen atoms in siderophore moieties interact strongly with the hard Fe(III) ion (Hernlem et al 1999). Siderophore complexes with the softer Fe(II) ion generally have much lower stability constants, and Fe(II)-hydroxamate siderophore complexes in particular may be unstable with respect to oxidation or auto-oxidation (Farkas et al 2001;Kim et al 2009). …”

Section: Stability and Exchange Of Mn And Fe Siderophore Complexesmentioning

confidence: 99%

“…Although the above definition of siderophores emphasizes their biological function, the siderophore database reveals commonalities in the structures of these exudates. Microbial siderophores are typically Helm and Merbach (1999) c Morgan (2000) d E H 8 = formal electrode potential from Stumm and Morgan (1996) e Sisley and Jordan (2006) f Kim et al (2009) g Kraemer (2004) h Duckworth and Sposito (2005a) i Estimated using cyclic voltammetry half-wave potential from Boukhalfa et al (2006) j Parker et al (2004) k Donat and Bruland (1995) l Diss. = dissolved; In suboxic zones of the Black Sea and Chesapeake Bay (Trouwborst et al 2006) m Part.…”

Section: Introductionmentioning

confidence: 99%

Coupled biogeochemical cycling of iron and manganese as mediated by microbial siderophores

2009

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Siderophores, biogenic chelating agents that facilitate Fe(III) uptake through the formation of strong complexes, also form strong complexes with Mn(III) and exhibit high reactivity with Mn (hydr)oxides, suggesting a pathway by which Mn may disrupt Fe uptake. In this review, we evaluate the major biogeochemical mechanisms by which Fe and Mn may interact through reactions with microbial siderophores: competition for a limited pool of siderophores, sorption of siderophores and metal-siderophore complexes to mineral surfaces, and competitive metal-siderophore complex formation through parallel mineral dissolution pathways. This rich interweaving of chemical processes gives rise to an intricate tapestry of interactions, particularly in respect to the biogeochemical cycling of Fe and Mn in marine ecosystems.

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“…In contrast, mono-coordinate complexes allow iron to be involved in electron transfer reactions (Avdeef et al 1978). The complexes formed by Fe(II) and catecholates compounds have strong reductant properties linked to the low standard one-electron reduction potential of the associated Fe(III)/Fe(II) redox couple (Kim et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Fe(III) Reduction in the Presence of Catechol in Seawater

et al. 2010

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Fe(II)-Fe(III) redox behavior has been studied in the presence of catechol under different pH, ionic media, and organic compound concentrations. Catechol undergoes oxidation in oxic conditions producing semiquinone and quinone and reduces Fe(III) in natural solutions including seawater (SW). It is a pH-dependent process. Under darkness, the amount of Fe(II) generated is smaller and is related to less oxidation of catechol. The Fe(II) regeneration is higher at lower pH values both in SW with log k = 1.86 (M -1 s -1 ) at pH 7.3 and 0.26 (M -1 s -1 ) at pH 8.0, and in NaCl solutions with log k of 1.54 (M -1 s -1 ) at pH 7.3 and 0.57 (M -1 s -1 ) at pH 8.0. At higher pH values, rate constants are higher in NaCl solutions than in SW. This is due to the complexation of Mg(II) present in the media with the semiquinone that inhibits the formation of a second Fe(II) through the reaction of this intermediate with other center Fe(Cat) ? .

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Hydroxamate siderophore-promoted reactions between iron(II) and nitroaromatic groundwater contaminants

Cited by 49 publications

References 74 publications

Metallophores and Trace Metal Biogeochemistry

Metallophores and Trace Metal Biogeochemistry

Coupled biogeochemical cycling of iron and manganese as mediated by microbial siderophores

Fe(III) Reduction in the Presence of Catechol in Seawater

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