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One substrate many enzymes virtual screening uncovers missing genes of carnitine biosynthesis in human and mouse

Author

Listed:
  • Marco Malatesta

    (University of Parma)

  • Emanuele Fornasier

    (University of Padua)

  • Martino Luigi Salvo

    (Sapienza University of Rome)

  • Angela Tramonti

    (Italian National Research Council)

  • Erika Zangelmi

    (University of Parma)

  • Alessio Peracchi

    (University of Parma)

  • Andrea Secchi

    (University of Parma)

  • Eugenia Polverini

    (University of Parma)

  • Gabriele Giachin

    (University of Padua)

  • Roberto Battistutta

    (University of Padua)

  • Roberto Contestabile

    (Sapienza University of Rome)

  • Riccardo Percudani

    (University of Parma)

Abstract

The increasing availability of experimental and computational protein structures entices their use for function prediction. Here we develop an automated procedure to identify enzymes involved in metabolic reactions by assessing substrate conformations docked to a library of protein structures. By screening AlphaFold-modeled vitamin B6-dependent enzymes, we find that a metric based on catalytically favorable conformations at the enzyme active site performs best (AUROC Score=0.84) in identifying genes associated with known reactions. Applying this procedure, we identify the mammalian gene encoding hydroxytrimethyllysine aldolase (HTMLA), the second enzyme of carnitine biosynthesis. Upon experimental validation, we find that the top-ranked candidates, serine hydroxymethyl transferase (SHMT) 1 and 2, catalyze the HTMLA reaction. However, a mouse protein absent in humans (threonine aldolase; Tha1) catalyzes the reaction more efficiently. Tha1 did not rank highest based on the AlphaFold model, but its rank improved to second place using the experimental crystal structure we determined at 2.26 Å resolution. Our findings suggest that humans have lost a gene involved in carnitine biosynthesis, with HTMLA activity of SHMT partially compensating for its function.

Suggested Citation

  • Marco Malatesta & Emanuele Fornasier & Martino Luigi Salvo & Angela Tramonti & Erika Zangelmi & Alessio Peracchi & Andrea Secchi & Eugenia Polverini & Gabriele Giachin & Roberto Battistutta & Roberto , 2024. "One substrate many enzymes virtual screening uncovers missing genes of carnitine biosynthesis in human and mouse," Nature Communications, Nature, vol. 15(1), pages 1-16, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47466-3
    DOI: 10.1038/s41467-024-47466-3
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    References listed on IDEAS

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    2. Pradeep Anand Ravindranath & Stefano Forli & David S Goodsell & Arthur J Olson & Michel F Sanner, 2015. "AutoDockFR: Advances in Protein-Ligand Docking with Explicitly Specified Binding Site Flexibility," PLOS Computational Biology, Public Library of Science, vol. 11(12), pages 1-28, December.
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