دورية أكاديمية
أعرض في EDS

Vitamin B 12 -dependent biosynthesis ties amplified 2-methylhopanoid production during oceanic anoxic events to nitrification.

التفاصيل البيبلوغرافية
العنوان: Vitamin B 12 -dependent biosynthesis ties amplified 2-methylhopanoid production during oceanic anoxic events to nitrification.
المؤلفون: Elling FJ; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138; felix_elling@fas.harvard.edu., Hemingway JD; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138., Evans TW; Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139., Kharbush JJ; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138.; Department of Earth and Environmental Science, University of Michigan, Ann Arbor, MI 48109., Spieck E; Department of Microbiology and Biotechnology, University of Hamburg, 22609 Hamburg, Germany., Summons RE; Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139., Pearson A; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138.
المصدر: Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2020 Dec 29; Vol. 117 (52), pp. 32996-33004. Date of Electronic Publication: 2020 Dec 14.
نوع المنشور: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.
اللغة: English
بيانات الدورية: Publisher: National Academy of Sciences Country of Publication: United States NLM ID: 7505876 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1091-6490 (Electronic) Linking ISSN: 00278424 NLM ISO Abbreviation: Proc Natl Acad Sci U S A Subsets: MEDLINE
أسماء مطبوعة: Original Publication: Washington, DC : National Academy of Sciences
مواضيع طبية MeSH: Nitrification*, Nitrobacter/*metabolism , Pentacyclic Triterpenes/*metabolism , Vitamin B 12/*metabolism, Ammonia/metabolism ; Methionine/metabolism ; Oxygen/analysis ; Oxygen/metabolism ; Plankton/metabolism ; Seawater/chemistry
مستخلص: Bacterial hopanoid lipids are ubiquitous in the geologic record and serve as biomarkers for reconstructing Earth's climatic and biogeochemical evolution. Specifically, the abundance of 2-methylhopanoids deposited during Mesozoic ocean anoxic events (OAEs) and other intervals has been interpreted to reflect proliferation of nitrogen-fixing marine cyanobacteria. However, there currently is no conclusive evidence for 2-methylhopanoid production by extant marine cyanobacteria. As an alternative explanation, here we report 2-methylhopanoid production by bacteria of the genus Nitrobacter , cosmopolitan nitrite oxidizers that inhabit nutrient-rich freshwater, brackish, and marine environments. The model organism Nitrobacter vulgaris produced only trace amounts of 2-methylhopanoids when grown in minimal medium or with added methionine, the presumed biosynthetic methyl donor. Supplementation of cultures with cobalamin (vitamin B 12 ) increased nitrite oxidation rates and stimulated a 33-fold increase of 2-methylhopanoid abundance, indicating that the biosynthetic reaction mechanism is cobalamin dependent. Because Nitrobacter spp. cannot synthesize cobalamin, we postulate that they acquire it from organisms inhabiting a shared ecological niche-for example, ammonia-oxidizing archaea. We propose that during nutrient-rich conditions, cobalamin-based mutualism intensifies upper water column nitrification, thus promoting 2-methylhopanoid deposition. In contrast, anoxia underlying oligotrophic surface ocean conditions in restricted basins would prompt shoaling of anaerobic ammonium oxidation, leading to low observed 2-methylhopanoid abundances. The first scenario is consistent with hypotheses of enhanced nutrient loading during OAEs, while the second is consistent with the sedimentary record of Pliocene-Pleistocene Mediterranean sapropel events. We thus hypothesize that nitrogen cycling in the Pliocene-Pleistocene Mediterranean resembled modern, highly stratified basins, whereas no modern analog exists for OAEs.
Competing Interests: The authors declare no competing interest.
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فهرسة مساهمة: Keywords: biomarker; cobalamin; hopanoids; nitrification; oceanic anoxic event
المشرفين على المادة: 0 (Pentacyclic Triterpenes)
7664-41-7 (Ammonia)
AE28F7PNPL (Methionine)
P6YC3EG204 (Vitamin B 12)
S88TT14065 (Oxygen)
SCR Organism: Nitrobacter vulgaris
تواريخ الأحداث: Date Created: 20201215 Date Completed: 20210212 Latest Revision: 20210615
رمز التحديث: 20221213
مُعرف محوري في PubMed: PMC7777029
DOI: 10.1073/pnas.2012357117
PMID: 33318211
قاعدة البيانات: MEDLINE
الوصف
تدمد:1091-6490
DOI:10.1073/pnas.2012357117