75: How Metabolism Shapes Enzyme Structures Over 400 Million Years

Lemke O et al., Nature - A deep structural and evolutionary analysis of 11,269 enzyme structures across Saccharomycotina reveals how metabolic context sculpts protein architecture. The study integrates AlphaFold2 models, proteomics and metabolic models to map hierarchical constraints on enzyme evolution. Key terms: enzyme evolution, metabolism, AlphaFold2, structural conservation, yeast.

Study Highlights:
The authors analyzed 11,269 predicted and experimental enzyme structures across 424 orthogroups in 27 yeast species to link structural divergence to metabolic properties. They show that metabolism constrains structural evolution at species, pathway and molecular scales, with substrate-binding sites being the most conserved and surface residues evolving fastest. Metal-binding, number of intracellular inhibitors, flux variability, protein abundance and biosynthetic cost each influence conservation. Cost optimization acts primarily on surface residues while catalytic and small-molecule interactions limit substitutions in binding sites.

Conclusion:
Enzyme structural evolution is governed primarily by catalytic function and metabolic context, producing a hierarchy of conservation that informs enzyme annotation and strategies for metabolic engineering.

Music:
Enjoy the music based on this article at the end of the episode.

Article title:
The role of metabolism in shaping enzyme structures over 400 million years

First author:
Lemke O

Journal:
Nature

DOI:
10.1038/s41586-025-09205-6

Reference:
Lemke O., Heineike B.M., Viknander S., et al. The role of metabolism in shaping enzyme structures over 400 million years. Nature (2025). https://doi.org/10.1038/s41586-025-09205-6

License:
This episode is based on an open-access article published under the Creative Commons Attribution 4.0 International License (CC BY 4.0) – https://creativecommons.org/licenses/by/4.0/

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QC:
This episode was checked against the original article PDF and publication metadata for the episode release published on 2025-07-14.

QC Scope:
- article metadata and core scientific claims from the narration
- excludes analogies, intro/outro, and music
- transcript coverage: Audited core scientific claims about structural evolution in enzymes under metabolic constraints, MR/CR metrics, abundance-cost effects, thiamine suicide enzymes, binding-site clusters, and AlphaFold2-based methodology as presented in the transcript.
- transcript topics: AlphaFold2-based structure prediction in Saccharomycotina; Mapping ratios (MR) and conservation ratios (CR) and their interpretation; Metabolic context: fermentation vs respiration and pathway effects; Enzyme abundance, flux, and cost optimization; Thiamine biosynthesis suicide enzymes and conservation; Binding-site clusters as predictive features for binding and PPIs

QC Summary:
- factual score: 10/10
- metadata score: 10/10
- supported core claims: 5
- claims flagged for review: 0
- metadata checks passed: 4
- metadata issues found: 0

Metadata Audited:
- article_doi
- article_title
- article_journal
- license

Factual Items Audited:
- Reported number of enzyme structures analyzed: 11,269 (AlphaFold2-predicted and experimentally determined).
- Orthogroups: 424; species: 27; reactions: 361 across 225 pathways.
- Binding sites are highly conserved; surface residues evolve fastest; core remains conserved.
- Abundance and cost i...