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Characterization of the Central Metabolic Pathways in Thermoanaerobacter sp Strain X514 via Isotopomer-Assisted Metabolite Analysis
Feng, Xueyang1; Mouttaki, Housna2,3; Lin, Lu2,3,4; Huang, Rick1; Wu, Bing1; Hemme, Christopher L.2,3; He, Zhili2,3; Zhang, Baichen5; Hicks, Leslie M.5; Xu, Jian4; Zhou, Jizhong2,3; Tang, Yinjie J.1
2009-08-01
发表期刊APPLIED AND ENVIRONMENTAL MICROBIOLOGY
卷号75期号:15页码:5001-5008
摘要

Thermoanaerobacter sp. strain X514 has great potential in biotechnology due to its capacity to ferment a range of C(5) and C(6) sugars to ethanol and other metabolites under thermophilic conditions. This study investigated the central metabolism of strain X514 via (13)C-labeled tracer experiments using either glucose or pyruvate as both carbon and energy sources. X514 grew on minimal medium and thus contains complete biosynthesis pathways for all macromolecule building blocks. Based on genome annotation and isotopic analysis of amino acids, three observations can be obtained about the central metabolic pathways in X514. First, the oxidative pentose phosphate pathway in X514 is not functional, and the tricarboxylic acid cycle is incomplete under fermentative growth conditions. Second, X514 contains (Re)-type citrate synthase activity, although no gene homologous to the recently characterized (Re)-type citrate synthase of Clostridium kluyveri was found. Third, the isoleucine in X514 is derived from acetyl coenzyme A and pyruvate via the citramalate pathway rather than being synthesized from threonine via threonine ammonia-lyase. The functionality of the citramalate synthase gene (cimA [Teth514_1204]) has been confirmed by enzymatic activity assays, while the presence of intracellular citramalate has been detected by mass spectrometry. This study demonstrates the merits of combining (13)C-assisted metabolite analysis, enzyme assays, and metabolite detection not only to examine genome sequence annotations but also to discover novel enzyme activities.

文章类型Article
WOS标题词Science & Technology ; Life Sciences & Biomedicine
DOI10.1128/AEM.00715-09
关键词[WOS]ESCHERICHIA-COLI ; FLUX ANALYSIS ; ISOLEUCINE BIOSYNTHESIS ; ETHANOL ; BACTERIUM ; BIOFUELS ; SYNTHASE ; GROWTH ; YIELD
收录类别SCI
语种英语
WOS研究方向Biotechnology & Applied Microbiology ; Microbiology
WOS类目Biotechnology & Applied Microbiology ; Microbiology
WOS记录号WOS:000268311600009
引用统计
文献类型期刊论文
条目标识符http://ir.qibebt.ac.cn/handle/337004/6564
专题单细胞中心组群
作者单位1.Washington Univ, Dept Energy Environm & Chem Engn, St Louis, MO 63130 USA
2.Univ Oklahoma, Inst Environm Genom, Norman, OK 73019 USA
3.Univ Oklahoma, Dept Bot & Microbiol, Norman, OK 73019 USA
4.Chinese Acad Sci, Qingdao Inst BioEnergy & Bioproc Technol, Qingdao, Peoples R China
5.Donald Danforth Plant Sci Ctr, St Louis, MO 63132 USA
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Feng, Xueyang,Mouttaki, Housna,Lin, Lu,et al. Characterization of the Central Metabolic Pathways in Thermoanaerobacter sp Strain X514 via Isotopomer-Assisted Metabolite Analysis[J]. APPLIED AND ENVIRONMENTAL MICROBIOLOGY,2009,75(15):5001-5008.
APA Feng, Xueyang.,Mouttaki, Housna.,Lin, Lu.,Huang, Rick.,Wu, Bing.,...&Tang, Yinjie J..(2009).Characterization of the Central Metabolic Pathways in Thermoanaerobacter sp Strain X514 via Isotopomer-Assisted Metabolite Analysis.APPLIED AND ENVIRONMENTAL MICROBIOLOGY,75(15),5001-5008.
MLA Feng, Xueyang,et al."Characterization of the Central Metabolic Pathways in Thermoanaerobacter sp Strain X514 via Isotopomer-Assisted Metabolite Analysis".APPLIED AND ENVIRONMENTAL MICROBIOLOGY 75.15(2009):5001-5008.
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