title: Cloning of a cDNA encoding phosphofructokinase from Haemonchus contortus.
abstract: Phosphofructokinase (PFK), the key regulatory enzyme in glycolysis, has been cloned from the pathogenic parasitic nematode Haemonchus contortus by functional complementation in Escherichia coli. An E. coli strain deleted for both PFK loci (strain DF1020) was transformed with plasmid DNA from a lambda ZAP II H. contortus cDNA library. Two out of 3 x 10(7) transformants were able to grow on minimal medium with mannitol as the sole carbon source. A plasmid, pPFK, containing a 2.7-kb insert, was isolated from one of these transformants and conferred on DF1020 the ability to grow on mannitol (the PFK phenotype). The complemented cells contain PFK enzyme activity, absent in the E. coli mutant, at levels considerably higher than in wild type E. coli. Sequence analysis of the 2.7-kb insert shows an open reading frame that predicts a 789-amino acid protein that has approximately 70% similarity to mammalian PFKs. The amino acid sequence around asp182, thought to be the catalytic site, is completely conserved from nematodes to mammals.
authors.affiliation: Molecular Biology Research, Upjohn Laboratories, Kalamazoo, MI 49001.
authors.forename: R D
authors.initials: RD
authors.lastname: Klein
authors.forename: E R
authors.initials: ER
authors.lastname: Olson
authors.forename: M A
authors.initials: MA
authors.lastname: Favreau
authors.forename: C A
authors.initials: CA
authors.lastname: Winterrowd
authors.forename: N T
authors.initials: NT
authors.lastname: Hatzenbuhler
authors.forename: M H
authors.initials: MH
authors.lastname: Shea
authors.forename: S C
authors.initials: SC
authors.lastname: Nulf
authors.forename: T G
authors.initials: TG
authors.lastname: Geary
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics; D005816:Genetic Complementation Test; D006189:Haemonchus / Q000201:enzymology* / Q000235:genetics; D008322:Mammals; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D016366:Open Reading Frames; D010732:Phosphofructokinase-1 / Q000235:genetics*; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid; D013045:Species Specificity
chemical_list: D004247:DNA; D010732:Phosphofructokinase-1