Molecular basis for the lack of enantioselectivity of human 3-phosphoglycerate kinase

C. Gondeau, L. Chaloin, P. Lallemand, B. Roy, C. Périgaud, T. Barman, A. Varga, M. Vas, C. Lionne, Stefan T. Arold

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Abstract

Non-natural L-nucleoside analogues are increasingly used as therapeutic agents to treat cancer and viral infections. To be active, L-nucleosides need to be phosphorylated to their respective triphosphate metabolites. This stepwise phosphorylation relies on human enzymes capable of processing L-nucleoside enantiomers. We used crystallographic analysis to reveal the molecular basis for the low enantioselectivity and the broad specificity of human 3-phosphoglycerate kinase (hPGK), an enzyme responsible for the last step of phosphorylation of many nucleotide derivatives. Based on structures of hPGK in the absence of nucleotides, and bound to L and D forms of MgADP and MgCDP, we show that a non-specific hydrophobic clamp to the nucleotide base, as well as a water-filled cavity behind it, allows high flexibility in the interaction between PGK and the bases. This, combined with the dispensability of hydrogen bonds to the sugar moiety, and ionic interactions with the phosphate groups, results in the positioning of different nucleotides so to expose their diphosphate group in a position competent for catalysis. Since the third phosphorylation step is often rate limiting, our results are expected to alleviate in silico tailoring of L-type prodrugs to assure their efficient metabolic processing.

Original languageEnglish
Pages (from-to)3620-3629
Number of pages10
JournalNucleic acids research
Volume36
Issue number11
DOIs
Publication statusPublished - Jun 1 2008

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ASJC Scopus subject areas

  • Genetics

Cite this

Gondeau, C., Chaloin, L., Lallemand, P., Roy, B., Périgaud, C., Barman, T., Varga, A., Vas, M., Lionne, C., & Arold, S. T. (2008). Molecular basis for the lack of enantioselectivity of human 3-phosphoglycerate kinase. Nucleic acids research, 36(11), 3620-3629. https://doi.org/10.1093/nar/gkn212