Trifolin: a Rhizobium recognition protein from white clover - PubMed (original) (raw)
Trifolin: a Rhizobium recognition protein from white clover
F B Dazzo et al. Biochim Biophys Acta. 1978.
Abstract
A protein agglutinin, trifoliin, was purified from white clover seeds and seedling roots. Trifoliin specifically agglutinates the symbiont of clover, Rhizobium trifolii, at concentrations as low as 0.2 microgram protein/ml, and binds to the surface of encapsulated R. trifolii 0403. This clover protein has a subunit with Mr approximately 50 000, an isoelectric point of 7.3, and contains carbohydrate. Antibody to purified trifoliin binds to the root hair region of 24-h-old clover seedlings, but does not bind to alfalfa, birdsfoot trefoil or joint vetch. The highest concentration of trifoliin on a clover root is present at sites where material in the capsule of R. trifolii binds. 2-Deoxy-D-glucose elutes trifoliin from intact clover-seedling roots, suggesting that this protein is anchored to root cell walls through its carbohydrate binding sites. We propose that trifoliin on the root hair surface plays an important role in the recognition of R. trifolii by clover.
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