Control of Nitrogenase mRNA Levels by Products of Nitrate Assimilation in the Cyanobacterium Anabaena sp. Strain PCC 7120 | Zendy

José Martı́n-Nieto | Zendy; Antonia Herrero | Zendy; Enrique Flores | Zendy

Open Access

Control of Nitrogenase mRNA Levels by Products of Nitrate Assimilation in the Cyanobacterium Anabaena sp. Strain PCC 7120

Author(s) -

José Martı́n-Nieto,

Antonia Herrero,

Enrique Flores

Publication year - 1991

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.97.2.825

Subject(s) - nitrogenase , heterocyst , nitrate reductase , anabaena , nitrogen fixation , cyanobacteria , nitrate , strain (injury) , biochemistry , biology , enzyme , microbiology and biotechnology , nitrogen assimilation , chemistry , bacteria , genetics , ecology , anatomy

Nitrate inhibited nitrogenase synthesis and heterocyst development in the cyanobacterium Anabaena sp. strain PCC 7120. Inhibition of dinitrogen fixation by nitrate did not take place, however, in nitrate reductase-deficient derivatives of this strain. Hybridization of total RNA isolated from cells grown on different nitrogen sources with an internal fragment of the nifD gene showed that regulation of nitrogenase activity by nitrate is exerted through a negative control of the nitrogenase mRNA levels.

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