Expression of rat liver 6-phosphofructose-2-kinase/fructose-2,6-bisphosphatase and its kinase domain in Escherichia coli

A. Tauler, A. J. Lange, M. R. El-Maghrabi, S. J. Pilkis

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


The rat liver bifunctional enzyme, 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase (ATP:D-fructose-6-phosphate 2-phosphotransferase/D-fructose-2,6-bisphosphate 2-phosphohydrolase, EC and its separate kinase domain were expressed in Escherichia coli by using an expression system based on bacteriophage T7 RNA polymerase. The bifuctional enzyme (470 residues per subunit) was efficiently expressed as a protein that starts with the initiator methionine residue and ends at the carboxyl-terminal tyrosine residue. The expressed protein was purified to homogeneity by anion exchange and Blue Sepharose chromatography and had kinetic and physical properties similar to the purified rat liver enzyme, including its behavior as a dimer during gel filtration, activation of the kinase by phosphate and inhibition by α-glycerol phosphate, and mediation of the bisphosphatase reaction by a phosphoenzyme intermediate. The expressed 6-phosphofructo-2-kinase also started with the initiator methionine but ended at residue 257. The partially purified kinase domain was catalytically active, had reduced affinities for ATP and fructose 6-phosphate compared with the kinase of the bifunctional enzyme, and had no fructose-2,6-bisphosphatase activity. The kinase domain also behaved as an oligomeric protein during gel filtration. The expression of an active kinase domain and the previous demonstration of an actively expressed bisphosphatase domain provide strong support for the hypothesis that the hepatic enzyme consists of two independent catalytic domains encoded by a fused gene.

Original languageEnglish (US)
Pages (from-to)7316-7320
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number19
StatePublished - 1989
Externally publishedYes


Dive into the research topics of 'Expression of rat liver 6-phosphofructose-2-kinase/fructose-2,6-bisphosphatase and its kinase domain in Escherichia coli'. Together they form a unique fingerprint.

Cite this