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Title 

Transcriptional regulation of the respiratory genes in the cyanobacterium synechocystis sp. PCC 6803 during the early response to glucose feeding

Authors 

Sanghyeob LeeJ Y RyuS Y KimJae Heung JeonJ Y SongH T ChoS B ChoiD ChoiN T MarsacY I Park

Publisher 

American Society of Plant Biologists

Issue Date 

2007

Citation 

Plant Physiology, vol. 145, no. 3, pp. 1018-1030

Keywords 

glucosecyanobacterium synechocystisglucose feedingtranscriptional regulationgenesgene expression profilinggene expression regulationgenetic transcriptiongeneticssynechocystis

Abstract 

The coordinated expression of the genes involved in respiration in the photosynthetic cyanobacterium Synechocystis sp. PCC 6803 during the early period of glucose (Glc) treatment is poorly understood. When photoautotrophically grown cells were supplemented with 10 mM Glc in the light or after a dark adaptation period of 14 h, significant increases in the respiratory activity, as determined by NAD(P)H turnover, respiratory O2 uptake rate, and cytosolic alkalization, were observed. At the same time, the transcript levels of 18 genes coding for enzymes associated with respiration increased with differential induction kinetics; these genes were classified into three groups based on their half-rising times. Transcript levels of the four genes gpi, zwf, pdhB, and atpB started to increase along with a net increase in NAD(P)H, while the onset of net NAD(P)H consumption coincided with an increase in those of the genes tktA, ppc, pdhD, icd, ndhD2, ndbA, ctaD1, cydA, and atpE. In contrast, the expression of the atpI/G/D/A/C genes coding for ATP synthase subunits was the slowest among respiratory genes and their expression started to accumulate only after the establishment of cytosolic alkalization. These differential effects of Glc on the transcript levels of respiratory genes were not observed by inactivation of the genes encoding the Glc transporter or glucokinase. In addition, several Glc analogs could not mimic the effects of Glc. Our findings suggest that genes encoding some enzymes involved in central carbon metabolism and oxidative phosphorylation are coordinately regulated at the transcriptional level during the switch of nutritional mode.

ISSN 

0032-0889

Link 

http://dx.doi.org/10.1104/pp.107.105023

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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