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- W1489764009 abstract "Human interleukin-3 (hIL-3) is a regulator of proliferation and differentiation of multipotent hemopoietic progenitor cells. Mutants of hIL-3 have been constructed by oligonucleotide-directed mutagenesis and expressed in Escherichia coli and Bacillus licheniformis. Purified muteins were assayed for induction of DNA synthesis in IL-3-dependent human cells and for binding to the IL-3 receptor. Residues at the NH2 and COOH termini together comprising one-quarter of the molecule could be removed without loss of biological function. Deletions of 6-15 residues within the central part of the molecule caused a large reduction (up to 5 logs) but no complete loss of activity. Substitution of evolutionary conserved residues resulted in a strong decrease of biological activity and demonstrated that the S-S bridge is an essential structural element in hIL-3. Interestingly, four muteins displayed a significantly higher potency of binding to the IL-3 receptor than in stimulating DNA synthesis. These results demonstrate that receptor binding may be (partly) disconnected from activation of DNA synthesis. Analysis of hIL-3 muteins demonstrated that the majority of monoclonal antibodies are directed against a small portion of the IL-3 molecule. The neutralizing potential of individual monoclonal antibodies could be increased by a combination of antibodies directed against nonoverlapping epitopes." @default.
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- W1489764009 date "1991-11-01" @default.
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- W1489764009 title "Receptor and antibody interactions of human interleukin-3 characterized by mutational analysis." @default.
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- W1489764009 doi "https://doi.org/10.1016/s0021-9258(18)54857-2" @default.
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