NDLI: Fractionation of stable carbon isotopes by photoautotrophically growing anoxygenic purple and green sulfur bacteria

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Fractionation of stable carbon isotopes by photoautotrophically growing anoxygenic purple and green sulfur bacteria

Content Provider	Springer Nature Link
Author	Zyakun, A. M. Lunina, O. N. Prusakova, T. S. Pimev, N. V. Ivav, M. V.
Copyright Year	2009
Abstract	Fractionation of stable carbon isotopes $^{12}$C and $^{13}$C by three pure cultures of photoautotrophic purple sulfur bacteria (Ectothiorhodospira shaposhnikovii, Lamprocystis purpureus, and Thiocapsa sp.) (PSB) and the green sulfur bacterium Prosthecochloris sp. (GSB) was investigated in 13–15-day experiments. The cultivation was carried out in a luminostat (2000 lx) on mineral media with 1–1.5 g/l NaHCO$_{3}$ (inoculum) with the subsequent transfer to the medium with up to 10 g/l NaHCO$_{3}$. For PSB, the difference in the quantitative characteristics of the isotopic composition of suspended carbon (including bacterial cells) and mineral carbon of the medium (Δ$^{13}$C = δ$^{13}$C$_{substrate}$ − δ$^{13}$C$_{biomass}$) changed from 15.0 to 34.3‰. For GSB, the range of Δ$^{13}$C changes was significantly less (18.3–22.7‰). These data suggested the possibility of a pool of soluble mineral carbon in PSB cells. The pool of intracellular mineral carbon was calculated; depending on the PSB species and growth stage, it varied from 0 to 68% of the total cell carbon. The α coefficients reflecting the carbon isotope fractionation by PSB and GBS and calculated from the changes of the bicarbonate carbon isotopic composition in the medium depending on its consumption were 1.029 ± 0.003 and 1.019 ± 0.001, respectively. These α values did not depend on the growth rate. CO$_{2}$ fixation on ribulose-bisphosphate was shown to be the major factor determining the carbon isotope fractionation by PSB; at the stage of CO$_{2}$ penetration into the cell, fractionation was insignificant. In GSB, fractionation occurred mostly at CO$_{2}$ penetration into the cell, while it was insignificant at the stage of carbon dioxide fixation in the reverse TCA cycle. Analysis of the isotopic data of the photosynthesis by PSB and GSB in meromictic lakes also revealed that in PSB-dominated natural communities suspended organic matter was more enriched with light $^{13}$C (Δ$^{13}$C = 23.4−24.6‰) than in the communities with more active GSB (Δ$^{13}$C = 10.2−14.0‰)
Starting Page	757
Ending Page	768
Page Count	12
File Format	PDF
ISSN	00262617
Journal	Microbiology
Volume Number	78
Issue Number	6
e-ISSN	16083237
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2009-12-06
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	$^{12}$C and $^{13}$C fractionation photoautotrophic growth Ectothiorhodospira shaposhnikovii Lamprocystis purpureus Thiocapsa sp. Prosthecochloris sp. indices of fractionation δ$^{13}$C (‰) and ɛ (‰) meromictic water bodies Medical Microbiology Microbiology
Content Type	Text
Resource Type	Article
Subject	Microbiology Applied Microbiology and Biotechnology

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Ectothiorhodospira lacustris sp. nov., a New Purple Sulfur Bacterium from Low-Mineralized Soda Lakes That Contains a Unique Pathway for Nitric Oxide Reduction.

Fractionation of stable carbon isotopes by photoautotrophically growing anoxygenic purple and green sulfur bacteria

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