NDLI: Clustering of the nitrite reductase gene and a light-regulated gene with nitrate assimilation loci in Chlamydomonas reinhardtii

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Planta : Volume 206, Issue 3, August 1998

Planta : Volume 206, Issue 1, July 1998

Clustering of the nitrite reductase gene and a light-regulated gene with nitrate assimilation loci in Chlamydomonas reinhardtii

Content Provider	Springer Nature Link
Author	Quesada, Alberto Gómez, Ia Fernández, Emilio
Copyright Year	1998
Abstract	Two new loci have been found to be clustered with five other genes for the nitrate assimilation pathway in the Chlamydomonas reinhardtii genome. One gene, located close to the 3′-end of the high-affinity nitrate transporter (HANT) gene Nrt2;2, corresponds to the nitrite reductase (NiR) structural gene Nii1. This is supported by a number of experimental findings: (i) NiR-deficient mutants have lost Nii1 gene expression; (ii) Nii1 mRNA accumulation is co-regulated with the expression of other structural genes of the nitrate assimilation pathway; (iii) nitrite (nitrate) utilization ability is recovered in the NiR mutants by functional complementation with a wild-type Nii1 gene; (iv) the elucidated NII1 amino acid sequence is highly similar to that of the cyanobacterial and higher-plant enzyme, and contains the predicted domains for plastidic ferredoxin-NiRs. Thus, the mutant phenotype and the mRNA sequence and expression of the Nii1 gene have been unequivocally related. Accumulation of mRNA for the second locus identified, Lde1 (light-dependent expression), was not regulated by nitrogen, but like nitrate-assimilation clustered genes, its expression was down-regulated in the dark.
Starting Page	259
Ending Page	265
Page Count	7
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	206
Issue Number	2
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-08-06
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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