Sequence, expression, and characterization of the first archaeal ATP-dependent 6-phosphofructokinase, a non-allosteric enzyme related to the phosphofructokinase-B sugar kinase family, from the hyperthermophilic crenarchaeote Aeropyrum pernix.

Publisher: Springer-Verlag Country of Publication: Germany NLM ID: 0410427 Publication Model: Print-Electronic Cited Medium: Print ISSN: 0302-8933 (Print) Linking ISSN: 03028933 NLM ISO Abbreviation: Arch Microbiol Subsets: MEDLINE

Original Publication: Berlin, New York, Springer-Verlag.

Sequence Analysis, DNA*; Adenosine Triphosphate/*metabolism ; Desulfurococcaceae/*enzymology ; Phosphofructokinases/*metabolism; Allosteric Regulation ; Amino Acid Sequence ; Cloning, Molecular ; Desulfurococcaceae/genetics ; Hot Temperature ; Kinetics ; Molecular Sequence Data ; Phosphofructokinases/genetics ; Recombinant Proteins/genetics ; Recombinant Proteins/metabolism ; Sequence Alignment

The gene (ORF APF0012) encoding the ATP-dependent 6-phosphofructokinase (ATP-PFK) of the hyperthermophilic archaeon Aeropyrum pernix was identified, cloned, and functionally expressed in Escherichia coli. The deduced amino acid sequence showed similarity (25-40%) to members of PFK-B sugar kinases. The purified recombinant enzyme is a heterotetramer of 115 kDa, composed of 34-kDa subunits. Rate dependence (at 85 degrees C) on both fructose 6-phosphate (F-6-P) and ATP followed Michaelis-Menten kinetics with apparent K(m) values of 0.25 mM and 0.68 mM, respectively; apparent V(max) values were about 5 U/mg. The enzyme was specific for ATP as phosphoryl donor, but showed a broader spectrum of phosphoryl acceptors: in addition to F-6-P, glucose 6-phosphate, adenosine, fructose, ribose 5-phosphate, and ribose were accepted. Enzyme activity required divalent cations; Mg(2+), which was most effective, could partially be replaced by Co(2+), Ni(2+), or Mn(2+). The enzyme had a temperature optimum of 90 degrees C and showed a significant thermostability up to 100 degrees C. ATP-PFK activity was not allosterically regulated by classical effectors of ATP-PFKs of eukarya and bacteria, such as ADP and phosphoenolpyruvate. In accordance, this archaeal ATP-PFK did not contain the typical conserved binding sites for these effectors. This is the first report of a sequence of an archaeal ATP-PFK related to the PFK-B sugar kinase family.

0 (Recombinant Proteins)
8L70Q75FXE (Adenosine Triphosphate)
EC 2.7.1 - (Phosphofructokinases)

Date Created: 20020118 Date Completed: 20020422 Latest Revision: 20131121

20250114

10.1007/s00203-001-0359-1

11797046