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Individual Culturing of Tigriopus Copepods and Quantitative Analysis of Their Mate-guarding Behavior
Published on: September 26, 2018
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TIGAR's promiscuity.
1*Institute of Functional Biology and Genomics (IBFG), University of Salamanca-CSIC, Zacarias Gonzalez 2, 37007 Salamanca, Spain.
The Biochemical Journal
|March 1, 2014
Summary
The TIGAR protein, previously thought to regulate cancer cell metabolism by inhibiting glycolysis via fructose-2,6-bisphosphate (F26BP), is actually a 2,3-bisphosphoglycerate (23BPG) phosphatase. This finding challenges TIGAR
Area of Science:
- Biochemistry
- Cancer Metabolism
- Enzymology
Background:
- TIGAR (TP53-induced glycolysis and apoptosis regulator) protein influences glucose metabolism and antioxidant defense in cancer cells.
- TIGAR was initially characterized as a fructose-2,6-bisphosphatase (F26BPase), a key regulator of glycolysis and gluconeogenesis.
- Its p53-dependence and role in modulating F26BP levels made it a significant target in cancer research.
Purpose of the Study:
- To rigorously investigate the enzymatic activity of recombinant TIGAR.
- To clarify the substrate specificity and regulatory role of TIGAR in cellular metabolism.
- To re-evaluate the established understanding of TIGAR's function in glycolysis regulation.
Main Methods:
- Purification and characterization of recombinant TIGAR protein.
- Enzymatic assays to determine substrate specificity, including 2,3-bisphosphoglycerate (23BPG) and F26BP.
- Inhibition studies of endogenous TIGAR to observe cellular metabolic changes.
Main Results:
- Recombinant TIGAR functions primarily as a 2,3-bisphosphoglycerate (23BPG) phosphatase.
- TIGAR also exhibits weaker phosphatase activity towards other phosphate esters, including F26BP.
- Inhibition of TIGAR leads to a significant accumulation of cellular 23BPG, with a context-dependent effect on F26BP levels.
Conclusions:
- The primary enzymatic activity of TIGAR is 23BPG dephosphorylation, not F26BP dephosphorylation.
- This challenges the prevailing model of TIGAR's role in regulating glycolysis through F26BP.
- TIGAR's function in controlling cellular metabolism via 23BPG represents a newly recognized mechanism with implications for health and disease.
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