Uptake of glutamine and glutamate by the dinitrogen-fixing cyanobacteriumAnabaenasp. PCC7120

Whole cells of the dinitrogen-fixing cyanobacterium Anabaena sp. PCC7120 exhibited Km values for l-glutamine and l-glutamate of 33 µM and 0.5 mM, respectively. Vmax of uptake was ca. 30 nmol mg−1 (chlorophyll) min−1 for both amino acids. The similar pattern of sensitivity to other amino acids exhibited by both transport activities suggests that a common transport system is involved in glutamine and glutamate uptake by this cyanobacterium.