Proteome Analyses of Strains ATCC 51142 and PCC 7822 of the Diazotrophic Cyanobacterium Cyanothece sp under Culture Conditions Resulting in Enhanced H2 Production

被引:17
作者
Aryal, Uma K. [1 ]
Callister, Stephen J. [1 ]
Mishra, Sujata [2 ]
Zhang, Xiaohui [2 ]
Shutthanandan, Janani I. [1 ]
Angel, Thomas E. [1 ]
Shukla, Anil K. [1 ]
Monroe, Matthew E. [1 ]
Moore, Ronald J. [1 ]
Koppenaal, David W. [1 ]
Smith, Richard D. [1 ]
Sherman, Louis [2 ]
机构
[1] Pacific NW Natl Lab, Richland, WA 99352 USA
[2] Purdue Univ, Dept Biol Sci, W Lafayette, IN 47907 USA
关键词
NITROGEN-FIXING CYANOBACTERIUM; HYDROGEN-PRODUCTION; TRANSCRIPTIONAL ANALYSIS; CONTINUOUS-LIGHT; DIURNAL RHYTHMS; METABOLISM; FIXATION; CARBON; CELLS; STRATEGY;
D O I
10.1128/AEM.02864-12
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
Cultures of the cyanobacterial genus Cyanothece have been shown to produce high levels of biohydrogen. These strains are diazotrophic and undergo pronounced diurnal cycles when grown under N-2-fixing conditions in light-dark cycles. We seek to better understand the way in which proteins respond to these diurnal changes, and we performed quantitative proteome analysis of Cyanothece sp. strains ATCC 51142 and PCC 7822 grown under 8 different nutritional conditions. Nitrogenase expression was limited to N-2-fixing conditions, and in the absence of glycerol, nitrogenase gene expression was linked to the dark period. However, glycerol induced expression of nitrogenase during part of the light period, together with cytochrome c oxidase (Cox), glycogen phosphorylase (Glp), and glycolytic and pentose phosphate pathway (PPP) enzymes. This indicated that nitrogenase expression in the light was facilitated via higher levels of respiration and glycogen breakdown. Key enzymes of the Calvin cycle were inhibited in Cyanothece ATCC 51142 in the presence of glycerol under H-2-producing conditions, suggesting a competition between these sources of carbon. However, in Cyanothece PCC 7822, the Calvin cycle still played a role in cofactor recycling during H-2 production. Our data comprise the first comprehensive profiling of proteome changes in Cyanothece PCC 7822 and allow an in-depth comparative analysis of major physiological and biochemical processes that influence H-2 production in both strains. Our results revealed many previously uncharacterized proteins that may play a role in nitrogenase activity and in other metabolic pathways and may provide suitable targets for genetic manipulation that would lead to improvement of large-scale H-2 production.
引用
收藏
页码:1070 / 1077
页数:8
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