Abstract
A subclone of rat pheochromocytoma cells expresses high affinity receptors for tetanus toxin on differentiation with NGF [Walton, K.M., Sandberg, K., Rogers, T.B. and Schnaar, R.L. (1988) J. Biol. Chem. 263, 2055–2063]. In the presence of protein cross-linking agents, [ 125I]tetanus toxin, bound to these cells at 0°C, forms a cross-linked product with apparent molecular weight of 120 kDa. The formation of [ 125I]tetanus toxin conjugate involves the heavy chain of the toxin, is prevented by cold toxin and it is largely reduced by pretreating cells with proteases, The cross-linked product is formed only upon incubation of the toxin with NGF-differentiated cells. These results suggest that a protein with apparent molecular weight of 20 kDa is involved in the neurospecific binding of tetanus toxin.
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