Studies on pathways of nitrate assimilation in the green alga Prasinocladus marinus

摘要

Studies are described on Prasinocladus marinus which suggest that glutamine synthetase (GS) may have an important and direct effect in regulating the control of its nitrate assimilation. Changes in the enzymes involved in primary nitrate assimilation under photoautotrophic, heterotrophic and N-starved conditions appear to be influenced by the activity of glutamin synthetase (GS). It is deactivated in photoautotrophic and heterotrophic cells by treatment with methioninesulfoximine (MSO), and its is suggested that deactivation may play an important part in the regulation of nitrate assimilation. It is still not clear whether the enzyme itself or products of its metabolism are responsible.