title: Pyrophosphate-dependent phosphofructokinase. Conservation of protein sequence between the alpha- and beta-subunits and with the ATP-dependent phosphofructokinase.
abstract: Full-length cDNA clones for the alpha- and beta-subunits of pyrophosphate-fructose 6-phosphate 1-phosphotransferase have been isolated from a cDNA expression library derived from potato tuber poly(A)+ RNA. The nucleotide sequences indicate that the alpha- and beta-subunits are related with about 40% of amino acid residues being identical. A comparison of the deduced amino acid sequences of both subunits of this enzyme with that of the major ATP-dependent fructose 6-phosphate 1-phosphotransferase from Escherichia coli (Shirakihara, Y., and Evans, P. R. (1988) J. Mol. Biol. 204, 973-994) showed little homology between the proteins except for regions involved in the binding of fructose 6-phosphate/fructose, 1,6-bisphosphate and possibly between regions binding pyrophosphate and the beta- and gamma-phosphates of ADP/ATP. A comparison of the derived secondary structures of the two subunits of the PPi-dependent enzyme with the known secondary structure of the E. coli ATP-dependent enzyme indicated that the overall structure of these enzymes is similar. These data suggest that catalytic activity resides on the beta-subunit of the pyrophosphate-dependent enzyme.
authors.affiliation: Department of Biology, Queen's University, Kingston, Ontario, Canada.
authors.forename: S M
authors.initials: SM
authors.lastname: Carlisle
authors.forename: S D
authors.initials: SD
authors.lastname: Blakeley
authors.forename: S M
authors.initials: SM
authors.lastname: Hemmingsen
authors.forename: S J
authors.initials: SJ
authors.lastname: Trevanion
authors.forename: T
authors.initials: T
authors.lastname: Hiyoshi
authors.forename: N J
authors.initials: NJ
authors.lastname: Kruger
authors.forename: D T
authors.initials: DT
authors.lastname: Dennis
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000595:Amino Acid Sequence; D001483:Base Sequence; D001665:Binding Sites; D015152:Blotting, Northern; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics; D011756:Diphosphates / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics; D008969:Molecular Sequence Data; D015394:Molecular Structure; D010732:Phosphofructokinase-1 / Q000235:genetics*; D015183:Restriction Mapping; D011198:Solanum tuberosum / Q000201:enzymology / Q000235:genetics
chemical_list: D011756:Diphosphates; D000255:Adenosine Triphosphate; D004247:DNA; D010732:Phosphofructokinase-1