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• W2073175531 abstract "The synthesis and isolation in purified form of two analogues of insulin is described. [21-Isoasparagine-A] ([Iasn21-A]) insulin differs from the parent molecule in that the amino acid residue, asparagine, found at the C terminus of the A chain (A21) has been replaced by isoasparagine. [Sar1, Iasn21-A] insulin differs from insulin in that both the A1 and A21 amino acid residues, glycine and asparagine, have been substituted by sarcosine and isoasparagine, respectively. The synthesis of these analogues followed the pattern employed in this laboratory for the synthesis of insulin and its analogues. The S-sulfonated derivatives of the A chain analogues were chemically synthesized, converted to their sulfhydryl forms, and then combined with the S-sulfonated B chain to produce the respective insulin analogues. Isolation of the insulin analogues from the combination mixtures was effected by chromatography on a carboxymethylcellulose column with an exponential sodium chloride gradient. By the mouse convulsion assay method [Iasn21-A]insulin possessed a potency of 21 IU/mg and [Sar1, Iasn21-A] insulin 15 IU/mg. The radioimmunoassay method gave values of 16 IU/mg for the former and 7IU/mg for the altter analogue. The natural hormone has a potency of 23-25 IU/mg by both assay methods. These data indicate that the alpha- and beta-carboxyl groups of the A21 amino acid residue are nearly equivalent in terms of their contribution to the expression of the biological activity of insulin. Furthermore, these data strengthen the speculation (Cosmatos, A., Johnson, S., Breier, B., and Katsoyannis, P. G. (1975), J. Chem. Soc. Perkin Trans. 1, 2157) that the change in the relative positive charge at the N-terminal amino acid residue of the A chain is responsible for the considerable decrease in the immunoreactivity observed in such modified insulins." @default.
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• W2073175531 date "1976-09-07" @default.
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• W2073175531 title "Synthesis of two biologically active insulin analogs with modifications at the N-terminal and N- and C-terminal amino acid residues" @default.
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• W2073175531 doi "https://doi.org/10.1021/bi00663a025" @default.
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