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. 1995 Apr 1;307(Pt 1):143–149. doi: 10.1042/bj3070143

Cloning, sequencing and expression of the pyrophosphate-dependent phosphofructo-1-kinase from Naegleria fowleri.

K L Wessberg 1, S Skolnick 1, J Xu 1, F Marciano-Cabral 1, R G Kemp 1
PMCID: PMC1136756  PMID: 7717968

Abstract

The cDNA for the PPi-dependent phosphofructo-1-kinase has been cloned and sequenced from a cDNA library prepared from the free-living amoeba Naegleria fowleri. The coding sequence of the cDNA consists of 1311 bases which translates into 437 amino acids with a molecular mass of 48095 Da. Comparison of the sequence with those of the previously described sequences of PPi-dependent phosphofructokinases from Propionibacterium freudenreichii and potato tuber revealed amino acid identities of 23 and 28% respectively and high conservation in those regions assumed to be part of the active site. The reading frame was cloned into an expression vector, which was transformed into Escherichia coli. Extracts of the transformed cells contained PPi-dependent phosphofructokinase activity that could be purified to homogeneity. The activity was lost on incubation with the chaotropic agent, KSCN, and recovered by subsequent incubation with AMP. These properties are consistent with those described by Mertens, De Jonckheere and Van Schaftingen [Biochem. J. (1993) 292, 797-803] for the enzyme prepared from Naegleria and support the idea that the cloned cDNA coded for the complete native enzyme. No nucleotide-binding motif or evidence for a nucleotide-binding site characteristic of the ATP-dependent phosphofructokinases could be found within the primary structure.

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Selected References

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