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Journal of the science of food and agriculture • 2018 | View Paper
“We now find that mutating two tyrosines to an isoleucine at the carboxyl end of the cytoplasmic tail cripples the ability of EBV to cause lymphoblastoid cell outgrowth, thereby marking a second transformation effector site, TES2.”
Proceedings of the National Academy of Sciences of the United States of America • 1997 | View Paper
“It appears that the van der Waals interaction between the side chain of isoleucine A2 and tyrosine A19 , present in crystalline insulin, is among the most important determinants for high biological activity in insulin.”
“Phenylalanine and tyrosine inhibit one site; proline and the straight-chain amino acids, alanine, methionine and cysteine inhibit another; and glycine and the branched-chain valine, leucine, and isoleucine inhibit a 3rd.”
“The presence of the isoleucine side chain also restricts the rotational conformation of another conserved residue in the molecule, tyrosine at position 106.”