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• W2125203391 startingPage "7009" @default.
• W2125203391 abstract "ABSTRACT The genes encoding the structural components of the nitrate/nitrite assimilation system of the oceanic cyanobacterium Synechococcus sp. strain WH 8103 were cloned and characterized. The genes encoding nitrate reductase ( narB ) and nitrite reductase ( nirA ) are clustered on the chromosome but are organized in separate transcriptional units. Upstream of narB is a homologue of nrtP that encodes a nitrate/nitrite-bispecific permease rather than the components of an ABC-type nitrate transporter found in freshwater cyanobacteria. Unusually, neither nirA nor ntcA (encoding a positive transcription factor of genes subject to nitrogen control) were found to be tightly regulated by ammonium. Furthermore, transcription of glnA (encoding glutamine synthetase) is up-regulated in ammonium-grown cells, highlighting significant differences in nitrogen control in this cyanobacterium. Nitrogen depletion led to the transient up-regulation of ntcA , nirA , nrtP , narB , and glnA in what appears to be an NtcA-dependent manner. The NtcA-like promoters found upstream of nirA , nrtP , and narB all differ in sequence from the canonical NtcA promoter established for other cyanobacteria, and in the case of nirA , the NtcA-like promoter was functional only in cells deprived of combined nitrogen. The ecological implications of these findings are discussed in the context of the oligotrophic nature of oceanic surface waters in which Synechococcus spp. thrive." @default.
• W2125203391 created "2016-06-24" @default.
• W2125203391 creator A5011194554 @default.
• W2125203391 creator A5032088880 @default.
• W2125203391 date "2003-12-01" @default.
• W2125203391 modified "2023-10-14" @default.
• W2125203391 title "Nitrate/NitriteAssimilation System of the Marine Picoplanktonic Cyanobacterium <i>Synechococcus</i> sp. Strain WH 8103: Effect of NitrogenSource and Availability on GeneExpression" @default.
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• W2125203391 doi "https://doi.org/10.1128/aem.69.12.7009-7018.2003" @default.
• W2125203391 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/310010" @default.
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