Human Proinsulin, VII. Synthesis of Two Protected Peptides Corresponding to the Sequences 1—45 and 46—86 of the Prohormone
1980
The synthesis of two protected large peptides 1--45, and 46--86 covering the entire amino acid sequence of human proinsulin is described. Peptide 1--45, was synthesized from two intermediate fragments 1--23 and 24--45 and purified by countercurrent distribution in dimethylformamide system (K = 0.5). Peptide 46--86 was synthesized from two intermediate fragments 46--70 and 71--86 and purified by countercurrent distribution in two solvent systems, the dimethylformamide system (K = 0.06), and the toluene system (K = 0.16).
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