2019
DOI: 10.1016/j.gca.2019.06.042
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CO2-dependent carbon isotope fractionation in Archaea, Part I: Modeling the 3HP/4HB pathway

Abstract: The 3-hydroxypropionate/4-hydroxybutyrate (3HP/4HB) pathway of carbon fixation is found in thermophilic Crenarchaeota of the order Sulfolobales and in aerobic, ammonia-oxidizing Thaumarchaeota. Unlike all other known autotrophic carbon metabolisms, this pathway exclusively uses HCO 3rather than CO 2 as the substrate for carbon fixation. Biomass produced by the 3HB/4HP pathway is relatively 13 Cenriched compared to biomass fixed by other autotrophic pathways, with total biosynthetic isotope effects ( Ar) of ca… Show more

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Cited by 15 publications
(9 citation statements)
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References 109 publications
(180 reference statements)
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“…6 ; [DIC] ≥ 2 mM) δ 13 C cren is offset by a predictable fractionation factor from δ 13 C DIC (refs. 40,41 ) and that the change in δ 13 C cren during the PETM closely approximates the CIE in the global exogenic carbon reservoir. We further couple δ 13 C cren to TEX 86 analyses which allows simultaneous reconstruction of CIE and temperature change in low-carbonate sediments, thereby circumventing confounding effects of carbonate dissolution prevalent during the PETM and other climate warming events.…”
Section: Introductionmentioning
confidence: 74%
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“…6 ; [DIC] ≥ 2 mM) δ 13 C cren is offset by a predictable fractionation factor from δ 13 C DIC (refs. 40,41 ) and that the change in δ 13 C cren during the PETM closely approximates the CIE in the global exogenic carbon reservoir. We further couple δ 13 C cren to TEX 86 analyses which allows simultaneous reconstruction of CIE and temperature change in low-carbonate sediments, thereby circumventing confounding effects of carbonate dissolution prevalent during the PETM and other climate warming events.…”
Section: Introductionmentioning
confidence: 74%
“…Flux balance modeling 41 and environmental data 40 suggest that carbon isotopic fractionation in marine Thaumarchaeota originates from passive CO 2 transport into the cell combined with slow conversion to HCO 3 - , resulting in a dependence of the expressed fractionation factor on the dissolved CO 2 concentration. Importantly, the effect is inverse to the influence of p CO 2 on carbon isotopic fractionation in phytoplankton, resulting in a smaller fractionation factor (ε DIC-Cren ) at high dissolved CO 2 concentrations 40,41 . Due to the p CO 2 increase during the PETM ε DIC-Cren may have been smaller by 0.75 ± 0.15‰ (range 0.6–0.9‰) during the peak-PETM compared to the pre-PETM (assuming Paleocene-Eocene atmospheric p CO 2 of ~850–2200 ppm, refs.…”
Section: Discussionmentioning
confidence: 99%
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“…However, these groups of microbes are differentially distributed with depth, and likely impart distinct carbon isotope values onto the MPn, given that PEP arises through distinct metabolic pathways. For example, the C isotope delta value of bulk biomass from cultures of the AOA N. maritimus was −20‰ depleted relative to the inorganic bicarbonate C‐delta value (Könneke et al, ), where fractionation was attributed to the biotin‐dependent acetyl/propionyl‐CoA carboxylase—an inorganic carbon fixation enzyme (Pearson et al, ). Methane from MPn derived from autotrophic AOA's would have a different delta value than that from SAR11 and drive different observed fractionations, given that SAR11‐type organisms acquire anabolic organic carbon from a variety of heterotrophic substrates (Malmstrom et al, ; Mary et al, ; Mou et al, ; Rappé et al, ).…”
Section: Resultsmentioning
confidence: 99%
“…Such concerns were recently discarded (cf. Pearson et al, 2019;Besseling et al, 2020), although it has been put forward that ε values could depend on growth rate and carbon dioxide concentration, resulting in deviations of up to ±2‰ between the measured and the reconstructed δ 13 C DIC values of modern seawater (cf. Hurley et al, 2019).…”
Section: Introductionmentioning
confidence: 99%