title: A crystalline A14-(2-nitro-4-trimethylammoniophenyl) derivative of bovine insulin.
abstract: [O-(2-Nitro-4-trimethylammoniophenyl)-TyrA 14]insulin (bovine) is a product formed on reaction of bovine insulin with the hydrophilic reagent 1-fluoro-2-nitro-4-trimethyl-ammoniobenzene iodide (TAN-F) in an aqueous buffer at pH 8.00. The derivative was isolated and its purity established by standard procedures. The identity of the derivative was determined by degrative studies with alpha-chymotrypsin. The addition of zinc to the above reaction decreases the yield of the title derivative, but increases the yield of the [N alpha-TAN-GlyA1] derivative. [N alpha-Boc-GlyA1]insulin was also reacted with the above mentioned reagent in an attempt to improve the yield of the A14-tyrosine derivative. The biological activity of this microcrystalline derivative was found to be 12.4 units/mg as measured by the mouse convulsion assay.
mesh_terms: D000596:Amino Acids / Q000032:analysis; D000818:Animals; D002417:Cattle; D055598:Chemical Phenomena; D002621:Chemistry; D002918:Chymotrypsin; D003460:Crystallization; D007328:Insulin / Q000031:analogs & derivatives*; D008722:Methods; D010446:Peptide Fragments / Q000032:analysis
chemical_list: D000596:Amino Acids; D007328:Insulin; D010446:Peptide Fragments; D002918:Chymotrypsin