Document Detail

Transcriptional profiling of nitrogen fixation in Azotobacter vinelandii.
MedLine Citation:
PMID:  21724999     Owner:  NLM     Status:  MEDLINE    
Most biological nitrogen (N(2)) fixation results from the activity of a molybdenum-dependent nitrogenase, a complex iron-sulfur enzyme found associated with a diversity of bacteria and some methanogenic archaea. Azotobacter vinelandii, an obligate aerobe, fixes nitrogen via the oxygen-sensitive Mo nitrogenase but is also able to fix nitrogen through the activities of genetically distinct alternative forms of nitrogenase designated the Vnf and Anf systems when Mo is limiting. The Vnf system appears to replace Mo with V, and the Anf system is thought to contain Fe as the only transition metal within the respective active site metallocofactors. Prior genetic analyses suggest that a number of nif-encoded components are involved in the Vnf and Anf systems. Genome-wide transcription profiling of A. vinelandii cultured under nitrogen-fixing conditions under various metal amendments (e.g., Mo or V) revealed the discrete complement of genes associated with each nitrogenase system and the extent of cross talk between the systems. In addition, changes in transcript levels of genes not directly involved in N(2) fixation provided insight into the integration of central metabolic processes and the oxygen-sensitive process of N(2) fixation in this obligate aerobe. The results underscored significant differences between Mo-dependent and Mo-independent diazotrophic growth that highlight the significant advantages of diazotrophic growth in the presence of Mo.
Trinity L Hamilton; Marcus Ludwig; Ray Dixon; Eric S Boyd; Patricia C Dos Santos; João C Setubal; Donald A Bryant; Dennis R Dean; John W Peters
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2011-07-01
Journal Detail:
Title:  Journal of bacteriology     Volume:  193     ISSN:  1098-5530     ISO Abbreviation:  J. Bacteriol.     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-08-12     Completed Date:  2011-10-06     Revised Date:  2013-06-28    
Medline Journal Info:
Nlm Unique ID:  2985120R     Medline TA:  J Bacteriol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4477-86     Citation Subset:  IM    
Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT 59717, USA.
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MeSH Terms
Azotobacter vinelandii / enzymology,  genetics*,  growth & development
DNA, Complementary / genetics,  metabolism
Evolution, Molecular
Gene Expression Profiling*
Gene Expression Regulation, Bacterial
Genes, Bacterial
Genetic Association Studies
Molybdenum / metabolism*
Nitrogen Fixation*
Reverse Transcriptase Polymerase Chain Reaction
Sequence Analysis, DNA
Reg. No./Substance:
0/DNA, Complementary; 7439-98-7/Molybdenum

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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