A structurally abnormal insulin causing human diabetes

Abstract
Insulin isolated from the pancreas of a diabetic patient with fasting hyperinsulinemia showed decreased activity in binding to cell membrane insulin receptors and in stimulating cellular 2-deoxyglucose transport and glucose oxidation. Chemical studies suggest that the isolated hormone is a mixture of normal insulin and an abnormal variant which contains a leucine for phenylalamine substitution at position 24 or 25 of the insulin B-chain.