anaerobic regulation
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2008 ◽  
Vol 72 (11) ◽  
pp. 3011-3014 ◽  
Author(s):  
Kaneyoshi YAMAMOTO ◽  
Fumika MATSUMOTO ◽  
Taku OSHIMA ◽  
Nobuyuki FUJITA ◽  
Naotake OGASAWARA ◽  
...  

2005 ◽  
Vol 56 (5) ◽  
pp. 1347-1357 ◽  
Author(s):  
Jeffrey A. Gralnick ◽  
C. Titus Brown ◽  
Dianne K. Newman

2005 ◽  
Vol 33 (1) ◽  
pp. 36-38 ◽  
Author(s):  
Á.T. Kovács ◽  
G. Rákhely ◽  
J. Balogh ◽  
G. Maróti ◽  
A. Fülöp ◽  
...  

Hydrogen metabolism is closely related to other important metabolic and energetic processes of bacterial cells, such as photosynthesis, anaerobic respiration and sulphur metabolism. Even small environmental changes influence these networks through different regulatory systems. The presence or absence of oxygen is one of the most important signals; how the cascades evolved to transmit this signal in different bacteria is summarized. In many instances, hydrogen is released only under anoxic conditions, because of bioenergetic considerations. Most [NiFe] hydrogenases are inactivated by oxygen, but many of them can be re-activated under reducing conditions. In addition to direct inactivation of the hydrogenases, oxygen can also regulate their expression. The global regulatory systems [FNR (fumarate and nitrate reduction regulator), ArcAB (aerobic respiratory control) and RegAB], which respond to alterations in oxygen content and redox conditions of the environment, have an important role in hydrogenase regulation of several bacteria. FNR-like proteins were shown to be important for the regulation of hydrogenases in Escherichia coli, Thiocapsa roseopersicina and Rhizobium leguminosarum, whereas RegA protein modulates the expression of hupSL genes in Rhodobacter capsulatus.


2000 ◽  
Vol 182 (14) ◽  
pp. 3920-3923 ◽  
Author(s):  
Biao Hu ◽  
Jiabi Zhu ◽  
San Chiun Shen ◽  
Guan-qiao Yu

ABSTRACT Our work provides evidence that a sequence characteristic of FNR binding sites, when interacted with by a trans-acting factor, activates anaerobic transcription of the nifLAoperon in Enterobacter cloacae. DNA gyrase activity has been found to be important for the anaerobic transcription of thenifLA promoter. Our results suggest that anaerobic regulation of the nifLA operon is mediated through the control of the promoter region-binding trans-acting factor at the transcriptional level, while DNA supercoiling functions in providing a topological requirement for the activation of transcription.


1998 ◽  
Vol 27 (1) ◽  
pp. 197-208 ◽  
Author(s):  
Paul M. McNicholas ◽  
Robin C. Chiang ◽  
Robert P. Gunsalus
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