Psychrotolerant Sulfate-reducing Bacteria from an Oxic Freshwater Sediment Description of Desulfovibrio cuneatus sp. nov. and Desulfovibrio litoralis sp. nov.

Sass, Henrik; Berchtold, Manfred; Branke, Jürgen; König, Helmut; Cypionka, Heribert; Babenzien, Hans‐Dietrich

doi:10.1016/s0723-2020(98)80025-8

Cited by 77 publications

(46 citation statements)

References 35 publications

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“…It is conceivable that psychrotolerant bacteria transported downslope have adaptive mechanisms to maximize and maintain a high growth yield at low temperature (Bakermans and Nealson, 2004), but it is not clear how allochthonous, mesophilic SRB derived from the shelf may proliferate when relocated to greater depths. It is noteworthy, however, that in laboratory studies both psychrophilic and mesophilic sulfate-reducing bacteria have shown comparable growth rates when grown on lactate (Knoblauch and Jørgensen 1999, Sass et al, 1998, suggesting that proliferation of mesophiles in permanently cold environments is conceivable. The hypothesis that allochthonous mesophilic SRB are transported from the shelf and remain viable in permanently cold sediment is also supported by sulfate reduction rates measured in intertidal temperate sediment that showed a characteristic mesophilic temperature response even when the sediment was stored for two years at 0 • C, not changing the temperature response very much over this period of time (Robador et al, 2009).…”

Section: Sediment Transport Effects On Experimentallydetermined Tempementioning

confidence: 99%

Temperature characteristics of bacterial sulfate reduction in continental shelf and slope sediments

2012

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Abstract. The temperature responses of sulfate-reducing microbial communities were used as community temperature characteristics for their in situ temperature adaptation, their origin, and dispersal in the deep sea. Sediments were collected from a suite of coastal, continental shelf, and slope sediments from the southwest and southeast Atlantic and permanently cold Arctic fjords from water depths ranging from the intertidal zone to 4327 m. In situ temperatures ranged from 8 • C on the shelf to −1 • C in the Arctic. Temperature characteristics of the active sulfate-reducing community were determined in short-term incubations with 35 S-sulfate in a temperature gradient block spanning a temperature range from 0 to 40 • C. An optimum temperature (T opt ) between 27 • C and 30 • C for the South Atlantic shelf sediments and for the intertidal flat sediment from Svalbard was indicative of a psychrotolerant/mesophilic sulfate-reducing community, whereas T opt ≤ 20 • C in South Atlantic slope and Arctic shelf sediments suggested a predominantly psychrophilic community. High sulfate reduction rates (20-50 %) at in situ temperatures compared to those at T opt further support this interpretation and point to the importance of the ambient temperature regime for regulating the short-term temperature response of sulfate-reducing communities. A number of cold (< 4 • C) continental slope sediments showed broad temperature optima reaching as high as 30 • C, suggesting the additional presence of apparently mesophilic sulfate-reducing bacteria. Since the temperature characteristics of these mesophiles do not fit with the permanently cold deep-sea environment, we suggest that these mesophilic microorganisms are of allochthonous origin and transported to this site. It is likely that they were deposited along with the mass-flow movement of warmer shelf-derived sediment. These data therefore suggest that temperature response profiles of bacterial carbon mineralization processes can be used as community temperature characteristics, and that mixing of bacterial communities originating from diverse locations carrying different temperature characteristics needs to be taken into account to explain temperature response profiles of bacterial carbon mineralization processes in sediments.

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Section: Sediment Transport Effects On Experimentallydetermined Tempementioning

confidence: 99%

Temperature characteristics of bacterial sulfate reduction in continental shelf and slope sediments

2012

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“…Even in pure culture, several SRB exhibit relatively high degrees of oxygen tolerance, remaining viable after up to 24 h of exposure to air (Abdollahi & Wimpenny, 1990;Cypionka et al, 1985). However, decreases in viability and cell motility (Marschall et al, 1993), morphological changes (Sass et al, 1998a) and inhibition of sulfate reduction (Krekeler et al, 1997) are observed with time when cells are exposed to oxygen, showing that oxygen is toxic to SRB. SRB might have developed adaptation strategies to protect them against oxygen, including oxygen removal.…”

Section: Introductionmentioning

confidence: 99%

Oxygen reduction in the strict anaerobe Desulfovibrio vulgaris Hildenborough: characterization of two membrane-bound oxygen reductases

et al. 2011

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Although Desulfovibrio vulgaris Hildenborough (DvH) is a strictly anaerobic bacterium, it is able to consume oxygen in different cellular compartments, including extensive periplasmic O 2 reduction with hydrogen as electron donor. The genome of DvH revealed the presence of cydAB and cox genes, encoding a quinol oxidase bd and a cytochrome c oxidase, respectively. In the membranes of DvH, we detected both quinol oxygen reductase [inhibited by heptyl-hydroxyquinoline-N-oxide (HQNO)] and cytochrome c oxidase activities. Spectral and HPLC data for the membrane fraction revealed the presence of o-, b-and d-type haems, in addition to a majority of c-type haems, but no a-type haem, in agreement with carbon monoxide-binding analysis. The cytochrome c oxidase is thus of the cc(o/b)o 3 type, a type not previously described. The monohaem cytochrome c 553 is an electron donor to the cytochrome c oxidase; its encoding gene is located upstream of the cox operon and is 50-fold more transcribed than coxI encoding the cytochrome c oxidase subunit I. Even when DvH is grown under anaerobic conditions in lactate/sulfate medium, the two terminal oxidase-encoding genes are expressed. Furthermore, the quinol oxidase bd-encoding genes are more highly expressed than the cox genes. The cox operon exhibits an atypical genomic organization, with the gene coxII located downstream of coxIV. The occurrence of these membrane-bound oxygen reductases in other strictly anaerobic Deltaproteobacteria is discussed.

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“…However, there is growing evidence that they can survive exposure to oxygen. One piece of evidence is that these bacteria have been isolated from superficial waters and aerated environments (25,43,48), suggesting that these organisms have a mechanism(s) of defense against oxygen radicals and that oxygen may play some physiological role in these bacteria. In fact, Desulfovibrio gigas contains a number of potential generators of superoxide anion, including cytochromes, flavodoxins, rubredoxins, and menaquinone.…”

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Purification and Characterization of an Iron Superoxide Dismutase and a Catalase from the Sulfate-Reducing Bacterium Desulfovibrio gigas

et al. 2000

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Psychrotolerant Sulfate-reducing Bacteria from an Oxic Freshwater Sediment Description of Desulfovibrio cuneatus sp. nov. and Desulfovibrio litoralis sp. nov.

Cited by 77 publications

References 35 publications

Temperature characteristics of bacterial sulfate reduction in continental shelf and slope sediments

Temperature characteristics of bacterial sulfate reduction in continental shelf and slope sediments

Oxygen reduction in the strict anaerobe Desulfovibrio vulgaris Hildenborough: characterization of two membrane-bound oxygen reductases

Purification and Characterization of an Iron Superoxide Dismutase and a Catalase from the Sulfate-Reducing Bacterium Desulfovibrio gigas

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