Expression of chicken liver 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase in Escherichia coli.

Abstract:

:Chicken liver 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase was expressed in E. coli by using a pET3a T7 RNA polymerase-based expression system and was purified to homogeneity. The kinase and bisphosphatase of the expressed bifunctional enzyme had kinetic properties identical to those of the native chicken liver enzyme. However, the kinase activity of the chicken liver enzyme was 7-fold higher, while the bisphosphatase activity was 50 percent lower than those of the rat liver enzyme. Cys-256 of the rat liver bisphosphatase domain is not conserved in the chicken liver enzyme. A site-directed mutation was engineered at Cys-256 of the rat liver enzyme and the results indicate that the variation of this residue is not responsible for the difference in fructose-2,6-bisphosphatase activity between the rat and chicken liver enzymes. It is postulated that the difference in the kinase/bisphosphatase activity ratios of these two enzymes results from differences in their NH2-terminal regions.

authors

Li L,Yao WZ,Lange AJ,Pilkis SJ,Dong MQ,Yin Y,Xu GJ

doi

10.1006/bbrc.1995.1581

subject

Has Abstract

pub_date

1995-04-26 00:00:00

pages

883-93

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(85)71581-1

journal_volume

209

pub_type

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