ArticleJournal of animal science and biotechnology2025
Mining expansin-like proteins from rumen microbiota and functional characterization of two anaerobic fungal expansin-like proteins.
Article in Journal of animal science and biotechnology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundSustainable livestock production is essential for food security and environmental management. Lignocellulosic biomass can be used in animal feed, thereby reducing feed production costs and enhancing sustainability. Expansin-like proteins (ELPs) play essential roles in plant cell wall degradation, yet their functions remain largely underexplored in rumen microbes. The purpose of this study was to investigate the effects of rumen microbial ELPs on lignocellulose degradation.
resultsThis study systematically identified 396 ELPs within the rumen microbiota, uncovering remarkable diversity, particularly among anaerobic fungi. Three representative ELPs from Pecoramyces ruminantium F1 (PFLoos_1, PFSWO1_1, PFSWO2_1) were selected for biochemical characterization. While PFSWO2_1 could not be expressed, PFLoos_1 and PFSWO1_1 exhibited significant synergy with cellulases. The CBM10-containing PFSWO1_1 demonstrated superior thermal stability (up to 65 °C) and substrate affinity, increasing rice straw hydrolysis efficiency by 21.6% (reducing sugar yield) compared to cellulase alone. Structural analyses revealed that CBM10 enabled PFSWO1_1 to preferentially bind complex substrates, whereas the single-domain PFLoos_1 targeted simpler substrates. Notably, ELP pretreatment of corn stover significantly improved fermentation quality (pH and lactic acid) and nutritional value (neutral detergent fiber, acid detergent fiber, and water-soluble carbohydrates).
conclusionsThese findings indicate that ELPs are abundant in the rumen and play a synergistic role in lignocellulosic biomass conversion.
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