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The genetic landscape of a metabolic interaction

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  • Thuy N. Nguyen

    (University of Texas Southwestern Medical Center
    University of Texas Southwestern Medical Center
    University of Texas Southwestern Medical Center
    Form Bio)

  • Christine Ingle

    (University of Texas Southwestern Medical Center
    University of Texas Southwestern Medical Center
    University of Texas Southwestern Medical Center)

  • Samuel Thompson

    (University of California
    Stanford University)

  • Kimberly A. Reynolds

    (University of Texas Southwestern Medical Center
    University of Texas Southwestern Medical Center
    University of Texas Southwestern Medical Center)

Abstract

While much prior work has explored the constraints on protein sequence and evolution induced by physical protein-protein interactions, the sequence-level constraints emerging from non-binding functional interactions in metabolism remain unclear. To quantify how variation in the activity of one enzyme constrains the biochemical parameters and sequence of another, we focus on dihydrofolate reductase (DHFR) and thymidylate synthase (TYMS), a pair of enzymes catalyzing consecutive reactions in folate metabolism. We use deep mutational scanning to quantify the growth rate effect of 2696 DHFR single mutations in 3 TYMS backgrounds under conditions selected to emphasize biochemical epistasis. Our data are well-described by a relatively simple enzyme velocity to growth rate model that quantifies how metabolic context tunes enzyme mutational tolerance. Together our results reveal the structural distribution of epistasis in a metabolic enzyme and establish a foundation for the design of multi-enzyme systems.

Suggested Citation

  • Thuy N. Nguyen & Christine Ingle & Samuel Thompson & Kimberly A. Reynolds, 2024. "The genetic landscape of a metabolic interaction," Nature Communications, Nature, vol. 15(1), pages 1-18, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47671-0
    DOI: 10.1038/s41467-024-47671-0
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    References listed on IDEAS

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