Glutamine GS Gs concentration AMP(1-12) Active Inactive when cells are grown in a medium rich in fixed nitrogen,glutamine synthetase(GS)is covalently modified by becoming progressively adenylylated.As many as 12 adenyl(AMP)groups can be added. When the medium becomes nitrogen poor,the groups are removed forming ADP.谷氨酸合成酶被腺苷酰化而受到共价调节 CHEN FENG,School of Life Sciences and Biotech.CHEN FENG，School of Life Sciences and Biotech. when cells are grown in a medium rich in fixed nitrogen, glutamine synthetase (GS) is covalently modified by becoming progressively adenylylated. As many as 12 adenyl(AMP) groups can be added. When the medium becomes nitrogen poor, the groups are removed forming ADP.谷氨酸合成酶被腺苷酰化而受到共价调节 Active Inactive