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. 1985 Jul 15;229(2):429–439. doi: 10.1042/bj2290429

Characterization of human interleukin 2 derived from Escherichia coli.

S M Liang, B Allet, K Rose, M Hirschi, C M Liang, D R Thatcher
PMCID: PMC1145075  PMID: 3899106

Abstract

Interleukin 2 isolated from Escherichia coli cells expressing the human interleukin gene has been characterized. The observed properties of the protein have been compared with those properties which can be deduced from the DNA sequence alone and the published properties of natural human interleukin 2. The purified E. coli-derived interleukin 2 is a monomeric protein of Mr 15 000 with a sedimentation velocity of 1.86S. The amino acid composition of the protein and isoelectric point (7.7) are consistent with that part of the translated DNA sequence of the gene corresponding to the mature protein. A single disulphide bridge was identified between Cys-58 and Cys-105. C.d. suggested that interleukin 2 is predominantly alpha-helical in secondary structure. The E. coli-derived protein differed from natural interleukin 2 in the presence of N-terminal methionine and also in the absence of a carbohydrate moiety. Removal of the coding region for the first three amino acids of the natural interleukin 2 protein sequence (Ala-Pro-Thr) by site-specific mutagenesis resulted in a protein with N-terminal serine. The possibility that the specificity of the E. coli ribosomal methionine aminopeptidase may not recognize the sequence NH2-Met-Xaa-Pro is discussed (where Xaa is any amino acid residue).

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