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Relative Reactivity to Iodination of Tyrosine Residues in -Chymotrypsin

From the ¹ From the Department of Biochemistry Research, Roswell Park Memorial Institute, Buffalo, New York 14203

The relative reactivity toward iodination of each of the 4 tyrosine residues in chymotrypsin was determined. The results showed that the reactivities of the tyrosine residues in native uniodinated chymotrypsin are in the order 146 > 94 > 171 > 229 with relative reactivities of 1:0.4 and 0.2:0.02, respectively. The relative reactivities indicate that one of the C chain tyrosines, namely 229, is buried since it is at most only 10% as reactive as the next least reactive tyrosine.

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