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.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Li L,Yao WZ,Lange AJ,Pilkis SJ,Dong MQ,Yin Y,Xu GJdoi
10.1006/bbrc.1995.1581subject
Has Abstractpub_date
1995-04-26 00:00:00pages
883-93issue
3eissn
0006-291Xissn
1090-2104pii
S0006-291X(85)71581-1journal_volume
209pub_type
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