中文版 | English
Title

The production of diverse brGDGTs by an Acidobacterium providing a physiological basis for paleoclimate proxies

Author
Corresponding AuthorZeng,Zhirui
Publication Years
2022
DOI
Source Title
ISSN
0016-7037
EISSN
1872-9533
Volume337
Abstract
Microbial lipid biomarkers preserved in geological archives can be used to explore past climate changes. Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are unique bacterial biomarkers that have been used as molecular tools for the quantitative determination of terrestrial temperatures and the pH of depositional environments over a range of geological timescales. However, the exact biological source organisms – especially of the entire suite of brGDGTs found in the environment – remains unclear; by extension, so do the mechanisms that govern these proxies. Here, we identified a brGDGT-producing strain Candidatus Solibacter usitatus Ellin6076, by identifying archaeal tetraether synthase homologs in bacterial genomes. This strain synthesizes diverse brGDGTs, including regular C-methylated and cyclic brGDGTs, and brGDGTs comprise up to 66 % of the major quantified lipids, far exceeding the proportions found in previous studies. The degree of C-methylation in cultured strain Ellin6076 is primarily determined by temperature, whereas cyclization appears to be influenced by multiple factors, such as temperature, pH and oxygen availability. Consequently, culture-derived paleoclimate indices are in agreement with the global soil-derived MBT’ (methylation index of C-methyl brGDGTs) proxy for temperature, albeit with a differed slope, but not the CBT (cyclization index of C-methyl brGDGTs) proxy for pH. Our findings provide insights from a physiological perspective into the underlying mechanism of brGDGT-based proxies.
Keywords
URL[Source Record]
Indexed By
Language
English
Important Publications
NI Journal Papers
SUSTech Authorship
First ; Corresponding
Funding Project
National Natural Science Foundation of China["32170041","42073072","20200925154325002"] ; Science, Technology, and Innovation Commission of Shenzhen Municipality[K19313901] ; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[ZDSYS201802081843490] ; [92051112]
WOS Research Area
Geochemistry & Geophysics
WOS Subject
Geochemistry & Geophysics
WOS Accession No
WOS:000892848700006
Publisher
ESI Research Field
GEOSCIENCES
Scopus EID
2-s2.0-85139025887
Data Source
Scopus
Citation statistics
Cited Times [WOS]:9
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/406278
DepartmentDepartment of Ocean Science and Engineering
Affiliation
1.Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),Guangzhou,511458,China
3.State Key Laboratory of Biogeology and Environmental Geology,Hubei Key Laboratory of Critical Zone Evolution,School of Geography and Information Engineering,China University of Geosciences,Wuhan,430074,China
4.Shenzhen Key Laboratory of Marine Archaea Geo-Omics,Southern University of Science and Technology,Shenzhen,518055,China
5.Organic Geochemistry Unit,School of Chemistry,School of Earth Sciences,Cabot Institute for the Environment,University of Bristol,Bristol,Cantock's Close,BS8 1TS,United Kingdom
First Author AffilicationDepartment of Ocean Science and Engineering
Corresponding Author AffilicationDepartment of Ocean Science and Engineering
First Author's First AffilicationDepartment of Ocean Science and Engineering
Recommended Citation
GB/T 7714
Chen,Yufei,Zheng,Fengfeng,Yang,Huan,et al. The production of diverse brGDGTs by an Acidobacterium providing a physiological basis for paleoclimate proxies[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2022,337.
APA
Chen,Yufei.,Zheng,Fengfeng.,Yang,Huan.,Yang,Wei.,Wu,Ruijie.,...&Zeng,Zhirui.(2022).The production of diverse brGDGTs by an Acidobacterium providing a physiological basis for paleoclimate proxies.GEOCHIMICA ET COSMOCHIMICA ACTA,337.
MLA
Chen,Yufei,et al."The production of diverse brGDGTs by an Acidobacterium providing a physiological basis for paleoclimate proxies".GEOCHIMICA ET COSMOCHIMICA ACTA 337(2022).
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