CAZyme fold architecture is conserved between disparate environments despite extreme sequence divergence.
Jeilu O, Simachew A, Hartmann EM, Alexandersson E, Johansson E
Soil Health
Every compost pile, every rotting log in your garden, and every bale of straw broken down for mulch depends on enzymes almost identical to those discovered in extreme African salt lakes — meaning we may soon have far better biological tools for turning plant waste into fuel or fertilizer.
Scientists looked at the tiny microbes living in two very different places — the salty, alkaline lakes of East Africa and the stomachs of cows and sheep — and studied the tools these microbes use to digest plant material. Even though the microbes were completely unrelated and their enzyme 'recipes' (DNA sequences) had drifted far apart, the actual physical shape of these plant-digesting tools stayed nearly identical. This tells us that shape is what really matters for breaking down plant sugars, and that extreme environments like soda lakes are treasure troves of undiscovered enzymes we could use to process plant waste more sustainably.
Key Findings
371 metagenome-assembled genomes were recovered from 34 samples; 84% of soda lake genomes and 52% of rumen genomes represented entirely new, previously unknown species.
All 12 predicted enzyme structures from 6 different carbohydrate-digesting enzyme families maintained their canonical 3D fold with high confidence (pTM scores 0.75–0.97) despite extreme sequence divergence between the two environments.
Rumen microbial communities showed significantly higher taxonomic diversity and were enriched in carbohydrate breakdown pathways, while soda lake communities showed greater evolutionary divergence and specialization in stress tolerance and carbon fixation.
chevron_right Technical Summary
Researchers compared microbes from African soda lakes and cattle stomachs and found that despite living in completely different environments, the enzymes these microbes use to break down plant material share the same 3D shapes — even when their genetic sequences look almost nothing alike. This opens up soda lakes as an untapped source of tough, versatile enzymes for biofuels, food processing, and other green industries.
Abstract Preview
Microbial carbohydrate-active enzymes (CAZymes) underpin carbon cycling across Earth's ecosystems; however, how contrasting environments shape CAZyme diversity and structural conservation remains p...
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