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Volume :20 Issue : 2 1993      Add To Cart                                                                    Download

Ammonium assimilation in the red microalga Porphyridium purpureum

Auther : O. A. AL-AMOUDI

Department of Biology, Faculty of Applied Sciences, Umm Al-Qura University, Makkah,

Kingdom of Saudi Arabia

 

ABSTRACT

 

Cells of Porphyridium purpureum contain levels of glutamate synthase (GOGAT) and NADPglutamate dehydrogenase (GDH) activity which are equivalent, but lower than that of glutamine synthetase (GS), indicating that the GDH pathway may share with the GS-GOGAT path a role in ammonium assimilation and regulation of nitrogen metabolism in this alga. Cells grown with different concentrations of nitrate and ammonium contained suficient GS activity to carry out the required rate of nitrogen assimilation under autotrophic as well as heterotrophic conditions. Methionine sulphoximine (MSO) inhibited GS activity to a greater degree in oitro than in oioo, but MSO inhibition of ammonium assimilation was much enhanced in nitrogen-starved cells. A role for GDH in nitrogen assimilation by P. purprrrerrm is supported by the observation that the alga grows normally in the presence of MSO, when GS activity is almost completely inhibited. The activity of GS is high in nitrate-grown cells.

 

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