Energy metabolism in Mycobacterium gilvum PYR-GCK: insights from transcript expression analyses following two states of induction

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Title
Energy metabolism in Mycobacterium gilvum PYR-GCK: insights from transcript expression analyses following two states of induction
Author(s)
A C Badejo; Won Hyong Chung; Namshin Kim; J C Chai; Y S Lee; K H Jung; H J Kim; Y G Chai
Bibliographic Citation
PLoS One, vol. 9, no. 6, pp. e99464-e99464
Publication Year
2014
Abstract
Mycobacterium gilvum PYR-GCK, a pyrene degrading bacterium, has been the subject of functional studies aimed at elucidating mechanisms related to its outstanding pollutant bioremediation/biodegradation activities. Several studies have investigated energy production and conservation in Mycobacterium, however, they all focused on the pathogenic strains using their various hosts as induction sources. To gain greater insight into Mycobacterium energy metabolism, mRNA expression studies focused on respiratory functions were performed under two different conditions using the toxic pollutant pyrene as a test substrate and glucose as a control substrate. This was done using two transcriptomic techniques: global transcriptomic RNA-sequencing and quantitative Real-Time PCR. Growth in the presence of pyrene resulted in upregulated expression of genes associated with limited oxygen or anaerobiosis in M.gilvum PYR-GCK. Upregulated genes included succinate dehydrogenases, nitrite reductase and various electron donors including formate dehydrogenases, fumarate reductases and NADH dehydrogenases. Oxidative phosphorylation genes (with respiratory chain complexes I, III - V) were expressed at low levels compared to the genes coding for the second molecular complex in the bacterial respiratory chain (fumarate reductase); which is highly functional during microaerophilic or anaerobic bacterial growth. This study reveals a molecular adaptation to a hypoxic mode of respiration during aerobic pyrene degradation. This is likely the result of a cellular oxygen shortage resulting from exhaustion of the oxygenase enzymes required for these degradation activities in M.gilvum PYR-GCK.
ISSN
1932-6203
Publisher
Public Library of Science
DOI
http://dx.doi.org/10.1371/journal.pone.0099464
Type
Article
Appears in Collections:
Division of Biomedical Research > Genome Editing Research Center > 1. Journal Articles
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