Cofactor-independent phosphoglycerate mutase has an essential role in Caenorhabditis elegans and is conserved in parasitic nematodes.

The Journal of Biological Chemistry
Yinhua ZhangClotilde K S Carlow

Abstract

Phosphoglycerate mutases catalyze the interconversion of 2- and 3-phosphoglycerate in the glycolytic and gluconeogenic pathways. They exist in two unrelated forms that are either cofactor (2,3-diphosphoglycerate)-dependent or cofactor-independent. The two enzymes have no similarity in amino acid sequence, tertiary structure, or catalytic mechanism. Certain organisms including vertebrates have only the cofactor-dependent form, whereas other organisms can possess the independent form or both. Caenorhabditis elegans has been predicted to have only independent phosphoglycerate mutase. In this study, we have cloned and produced recombinant, independent phosphoglycerate mutases from C. elegans and the human-parasitic nematode Brugia malayi. They are 70% identical to each other and related to known bacterial, fungal, and protozoan enzymes. The nematode enzymes possess the catalytic serine, and other key amino acids proposed for catalysis and recombinant enzymes showed typical phosphoglycerate mutase activities in both the glycolytic and gluconeogenic directions. The gene is essential in C. elegans, because the reduction of its activity by RNA interference led to embryonic lethality, larval lethality, and abnormal body morphology. Prom...Continue Reading

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Citations

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