Facile Amide Bond Formation From Esters of Amino Acids and Peptides Catalyzed by Alkaline Protease in Anhydrous<i>tert</i>-Butyl Alcohol Using Ammonium Chloride/Triethylamine as a Source of Nucleophilic Ammonia
作者:Shui-Tein Chen、Ming-Kuei Jang、Kung-Tsung Wang
DOI:10.1055/s-1993-25955
日期:——
An industrial alkaline protease "Alcalase", stable and active in tert-butyl alcohol, was used to catalyze the synthesis of N-protected amino acids or peptide amides in anhydrous tert-butyl alcohol using ammonium chloride/triethylamine as source of nucleophilic ammonia
The amide form of the heptatriacontapeptide corresponding to the entire amino acid sequence of one of the human pancreatic tumor-derived peptides, termed growth hormone releasing factor (hpGRF), was synthesized in a conventional manner using a thioanisole-mediated deprotection procedure. In in vivo assay, this peptide (hpGRF-37-NH2) was as active as the synthetic tetratetracontapeptide amide (hpGRF-44-NH2). However, in in vitro assay, the potency of synthetic hpGRF-37-NH2 was only 15% of that of synthetic hpGRF-44-NH2. In addition, Nα-biotinyl-GRF-44-NH2 was prepared for histochemical receptor studies. This GRF-derivative exhibited approximately 60% of the activity of hpGRF-44-NH2.