Proanthocyanidins inhibit methane emissions by interacting with methyl-coenzyme M reductase and reshaping rumen microbiome function.
Liu Z, Guo Y, Xiao L, Guo J, Chen Y
Climate Adaptation
The tannin-rich plants already growing in your garden — grapevines, blueberry bushes, apple trees — produce compounds that, fed to livestock, could cut the methane burps that make cattle one of farming's biggest climate problems.
Cows produce huge amounts of methane — a potent greenhouse gas — because of microbes living in their stomachs. Researchers tested thousands of natural plant chemicals and found that the bitter tannins in berries, grapes, and similar fruits can block the enzyme those microbes use to make methane. Feeding these plant compounds to livestock could offer a natural, low-intervention way to reduce agriculture's climate footprint.
Key Findings
Proanthocyanidins ranked as the top candidate among 3,900 phytochemicals screened, with a predicted binding affinity of -8.150 kcal/mol to the methane-producing enzyme MCR.
Laboratory rumen fermentation assays confirmed that proanthocyanidin supplementation measurably reduced methane production.
PAC supplementation also reshaped the rumen microbial community, suggesting a dual mechanism: direct enzyme inhibition plus microbiome-level suppression of methanogens.
chevron_right Technical Summary
Scientists screened 3,900 plant compounds and found that proanthocyanidins — tannins abundant in berries, grapes, and apples — can significantly reduce methane emissions from cattle by blocking a key enzyme in methane-producing gut microbes and reshaping the rumen's microbial community.
Abstract Preview
Enteric methane (CH Molecular docking of 3,900 phytochemicals identified proanthocyanidins (PAC) as top candidate, exhibiting strong predicted affinity to the MCR active site (-8.150 kcal/mol). In ...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Was this useful?
Chloroplast Genome Editing Eliminates Gluten Immunogenicity in Triticum aestivum
It could mean that people with celiac disease — roughly 1 in 100 worldwide — may one day safely eat bread made from real wheat, without sacrificing the taste...