Related Experiment Video
Updated: Aug 15, 2026

Isolation of Primary Mouse Hepatocytes for Nascent Protein Synthesis Analysis by Non-radioactive L-azidohomoalanine Labeling Method
Published on: October 23, 2018
Modulation of fish liver fructose-1, 6-bis phosphatase by ammonia stress
S Chattoraj-Bhattacharyya1, S Das, A B Das
1Department of Botany, Visva Bharati University, Santiniketan, India.
Abstract:
Hepatic fructose 1, 6 bisphosphatase (Fru-P2ase) from Channa punctatus exhibits 100% and 60% elevations of its maximal catalytic rates (Vmax) at pH 7.5 and 9.5 respectively in summer over those in winter. Both the neutral and alkaline activities of the enzyme are enhanced remarkably (100%) in the winter-adapted fish due to exposure to 10 mg N/1 of unionized ammonia for three weeks. While the neutral activity of the purified enzyme is increased in vitro by NH+4 ions in dose-dependent manner upto about 150 mM NH4, the alkaline activity is found to be activated at a very low concentration of NH4+ (25 mM) and inhibited at 100-150 mM NH4+. The enzyme also shows a characteristics potentiation of 5'-AMP inhibition by NH4+ (125 mM).
Related Concept Videos
Protein Kinases and Phosphatases
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Stringent Response in E. coli
Other Stress Responses in Bacteria

