Regulation of nif gene expression and the energetics of N 2 fixation over the diel cycle in a hot spring microbial mat

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Show simple item record Steunou, A-S Jensen, SI Brecht, E Becraft, ED Bateson, MM Kilian, O Bhaya, D Ward, DM Peters, JW Grossman, AR Kühl, M 2012-02-02T10:57:42Z 2008-04
dc.identifier.citation ISME Journal, 2008, 2 (4), pp. 364 - 378
dc.identifier.issn 1751-7362
dc.identifier.other C1UNSUBMIT en_US
dc.description.abstract Nitrogen fixation, a prokaryotic, O 2 -inhibited process that reduces N 2 gas to biomass, is of paramount importance in biogeochemical cycling of nitrogen. We analyzed the levels of nif transcripts of Synechococcus ecotypes, NifH subunit and nitrogenase activity over the diel cycle in the microbial mat of an alkaline hot spring in Yellowstone National Park. The results showed a rise in nif transcripts in the evening, with a subsequent decline over the course of the night. In contrast, immunological data demonstrated that the level of the NifH polypeptide remained stable during the night, and only declined when the mat became oxic in the morning. Nitrogenase activity was low throughout the night; however, it exhibited two peaks, a small one in the evening and a large one in the early morning, when light began to stimulate cyanobacterial photosynthetic activity, but O 2 consumption by respiration still exceeded the rate of O 2 evolution. Once the irradiance increased to the point at which the mat became oxic, the nitrogenase activity was strongly inhibited. Transcripts for proteins associated with energy-producing metabolisms in the cell also followed diel patterns, with fermentation-related transcripts accumulating at night, photosynthesis- and respiration-related transcripts accumulating during the day and late afternoon, respectively. These results are discussed with respect to the energetics and regulation of N 2 fixation in hot spring mats and factors that can markedly influence the extent of N 2 fixation over the diel cycle. © 2008 International Society for Microbial Ecology All rights reserved.
dc.language eng
dc.relation.isbasedon 10.1038/ismej.2007.117
dc.title Regulation of nif gene expression and the energetics of N 2 fixation over the diel cycle in a hot spring microbial mat
dc.type Journal Article
dc.description.version Published
dc.parent ISME Journal
dc.journal.volume 4
dc.journal.volume 2
dc.journal.number 4 en_US
dc.publocation United Kingdom en_US
dc.publocation USA
dc.identifier.startpage 364 en_US
dc.identifier.endpage 378 en_US SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.conference American Society for Infomration Science and Technology
dc.for 1002 Environmental Biotechnology
dc.personcode 107129
dc.percentage 100 en_US Environmental Biotechnology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US 2010-10-22
dc.location.activity en_US
dc.location.activity Pittsburgh, USA
dc.description.keywords Gene expression
dc.description.keywords In situ
dc.description.keywords Microsensor
dc.description.keywords Nitrogen fixation
dc.description.keywords Synechococcus
dc.description.keywords Yellowstone national park
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - C3
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
pubs.consider-herdc false
utslib.collection.history Closed (ID: 3)

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