Metabolic flux analysis in Synechocystis using isotope distribution from 13C-labeled glucose

被引:178
|
作者
Yang, C
Hua, Q
Shimizu, K [1 ]
机构
[1] Kyushu Inst Technol, Dept Biochem Engn & Sci, Iizuka, Fukuoka 8208502, Japan
[2] Keio Univ, Inst Adv Biosci, Yamagata 9970017, Japan
关键词
metabolic fluxes; Synechocystis; NMR spectroscopy; GC-MS;
D O I
10.1006/mben.2002.0226
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Using the carbon isotope labeling technique, the response of cyanobacterial central carbon metabolism to the change in environmental conditions was investigated. Synechocystis was grown in the heterotrophic and mixotrophic cultures fed with C-13-labeled glucose. The labeling patterns of the amino acids in biomass hydrolysates for both cultures were detected by the two-dimensional H-1-C-13 correlation nuclear magnetic resonance (2D H-1-C-13 COSY NMR) spectroscopy and gas chromatographymass spectrometry (GC-MS) technique. The in vivo intracellular flux distributions were then quantitated from the labeling measurements and metabolite balances using a parameter fitting approach. From the estimated flux distributions, it was found that the pentose phosphate pathway was the major pathway of glucose catabolism in the heterotrophic culture, while in the mixotrophic culture, the flux Of CO2 fixation through the Calvin cycle was about two-fold of the glucose input flux. The relative flux through the phosphoenolpyruvate carboxylase was very high in both cultures, and this reaction represented about 25% of the assimilated CO2 in the mixotrophic culture. More importantly, we found a substantial outflow from the tricarboxylic acid cycle to glycolysis pathway carried by the malic enzyme, demonstrating the operation of a C-4 pathway in cyanobacterial cells through the PEP carboxylase and malic enzyme. The estimated flux distributions also revealed that the NADPH synthesis was in excess relative to its requirement, and the excess NADPH might be reoxidized in cyanobacterial respiration to provide the energy for cellular requirement. Moreover, the analyzed result also suggested that the activity of the respiratory electron transport chain in cyanobacterial cells was not inhibited by light. (C) 2002 Elsevier Science (USA).
引用
收藏
页码:202 / 216
页数:15
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