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- W1569342091 abstract "Human interleukin-2 (IL-2) has 3 cysteine residues; cysteines 58 and 105 form an intramolecular disulfide bridge, whereas cysteine 125 has a free sulfhydryl group. In this study, site-specific mutagenesis has been used to modify the cysteine residues of recombinant Escherichia coli-derived IL-2 (rIL-2) to evaluate the functional structure of IL-2. Substitution or deletion of cysteine 105 disrupted the disulfide bridge and yielded a mutant protein which was 8-10 times less active than wild type rIL-2. A similar modification at position 58, however, reduced the activity of rIL-2 by more than 250-fold. Although substitution of serine for cysteine 125 did not affect IL-2 activity, deletion of cysteine 125 or deletion of amino acids in the vicinity of this cysteine yielded mutant proteins with little, if any, activity. These results indicate that the protein structure in the vicinity of both positions 58 and 125 is more critical than that close to position 105. These findings may provide a clue to the understanding of the functional structure of human IL-2." @default.
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- W1569342091 date "1986-01-01" @default.
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- W1569342091 title "Studies of structure-activity relationships of human interleukin-2." @default.
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- W1569342091 doi "https://doi.org/10.1016/s0021-9258(17)42475-6" @default.
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