Glutamine Synthetase catalyzes the conversion of ammonia and glutamate to glutamine. This reaction consumes a molecule of ATP:Glutamate + NH4+ + ATP , and produces, Glutamine + ADP + Pi. It is found in astrocytes as an octamer of identical 45kDa subunits. The function of Glutamine Synthetase is the detoxification of brain ammonia. It also has an important role in controlling metabolic regulations of neurotransmitter glutamate. Because of the multiple functions and importance of Glutamine Synthetase in cellular metabolism, both catalytic activities and synthesis are highly regulated. The activity of Glutamine Synthetase is controlled by adenylylation. Its activity is decreased in the cerebral cortex of brains affected by Alzheimer's disease, particularly in the vicinity of senile plaques. It is also decreased under conditions of glucose deprivation. On the other hands, the level of expression of Glutamine Synthetase is increased during ischemia in vivo or hypoxia in culture.
Applications:
Suitable for use in ELISA, Western Blot and Immunoprecipitation. Other applications not tested.
Recommended Dilution:
Optimal dilutions to be determined by the researcher.
Storage and Stability:
May be stored at 4 degrees C for short-term only. For long-term storage and to avoid repeated freezing and thawing, aliquot Store at -20 degrees C. Aliquots are stable for at least 12 months at -20 degrees C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.
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