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Molecular characterization of nitrate uptake and assimilatory pathway in Arthrospira platensis reveals nitrate induction and differential regulation

Molecular characterization of nitrate uptake and assimilatory pathway in Arthrospira platensis... The nitrate assimilation pathway and its regulation in the high-protein neutraceutical cyanobacterium, Arthrospira ( Spirulina ), were studied. A complete characterization of the genes of the nitrate uptake and assimilatory pathway in Arthrospira platensis strain PCC 7345 was done including cloning, sequencing, phylogenetic analysis and expression studies. Genomic localization studies revealed that their clustering is different from the operons known in other cyanobacteria; only nrtP and narB are organized together, while nirA , glnA and gltS exist in separate genomic locations. The presence of both types of nitrate transporters ( nrtP /ABC types) in A. platensis is rare, as their occurrence is usually specific to marine and freshwater microorganisms, respectively. The positive effect of nitrate on transcript accumulation of narB , nirA and nrtP genes in N-depleted and N-restored cultures confirmed nitrate induction, which is abolished by the addition of ammonium ions into the medium. Gene expression studies in response to nitrate, nitrite, ammonium and glutamine provided the first evidence of differential regulation of multiple genes of nitrate assimilatory pathway in Arthrospira . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Microbiology Springer Journals

Molecular characterization of nitrate uptake and assimilatory pathway in Arthrospira platensis reveals nitrate induction and differential regulation

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References (42)

Publisher
Springer Journals
Copyright
Copyright © 2014 by Springer-Verlag Berlin Heidelberg
Subject
Life Sciences; Microbiology; Microbial Ecology; Biochemistry, general; Cell Biology; Biotechnology; Ecology
ISSN
0302-8933
eISSN
1432-072X
DOI
10.1007/s00203-014-0973-3
pmid
24643448
Publisher site
See Article on Publisher Site

Abstract

The nitrate assimilation pathway and its regulation in the high-protein neutraceutical cyanobacterium, Arthrospira ( Spirulina ), were studied. A complete characterization of the genes of the nitrate uptake and assimilatory pathway in Arthrospira platensis strain PCC 7345 was done including cloning, sequencing, phylogenetic analysis and expression studies. Genomic localization studies revealed that their clustering is different from the operons known in other cyanobacteria; only nrtP and narB are organized together, while nirA , glnA and gltS exist in separate genomic locations. The presence of both types of nitrate transporters ( nrtP /ABC types) in A. platensis is rare, as their occurrence is usually specific to marine and freshwater microorganisms, respectively. The positive effect of nitrate on transcript accumulation of narB , nirA and nrtP genes in N-depleted and N-restored cultures confirmed nitrate induction, which is abolished by the addition of ammonium ions into the medium. Gene expression studies in response to nitrate, nitrite, ammonium and glutamine provided the first evidence of differential regulation of multiple genes of nitrate assimilatory pathway in Arthrospira .

Journal

Archives of MicrobiologySpringer Journals

Published: Jun 1, 2014

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