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. 1989 Dec;86(24):9642–9646. doi: 10.1073/pnas.86.24.9642

Evolution of a bifunctional enzyme: 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase.

J F Bazan 1, R J Fletterick 1, S J Pilkis 1
PMCID: PMC298557  PMID: 2557623

Abstract

The bifunctional rat liver enzyme 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase (ATP:D-fructose-6-phosphate 2-phosphotransferase/D-fructose-2,6-bisphosphate 2-phosphohydrolase, EC 2.7.1.105/EC 3.1.3.46) is constructed of two independent catalytic domains. We present evidence that the kinase and bisphosphatase halves of the bifunctional enzyme are, respectively, structurally similar to the glycolytic enzymes 6-phosphofructo-1-kinase and phosphoglycerate mutase. Computer-assisted modeling of the C-terminal bisphosphatase domain reveals a hydrophobic core and active site residue constellation equivalent to the yeast mutase structure; structural differences map to length-variable, surface-located loops. Sequence patterns derived from the structural alignment of mutases and the bisphosphatase further detect a significant similarity to a family of acid phosphatases. The N-terminal kinase domain, in turn, is predicted to form a nucleotide-binding fold that is analogous to a segment of 6-phosphofructo-1-kinase, suggesting that these unrelated enzymes bind fructose 6-phosphate and ATP substrates in a similar geometry. This analysis indicates that the bifunctional enzyme is the likely product of gene fusion of kinase and mutase/phosphatase catalytic units.

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Selected References

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