Abstract
1. 1. The total capacity of various sections of the trout gut for the hydrolysis of glycyl-leucine, glycyl-phenylalanine and phenylalanyl-glycine was determined. 2. 2. Overall capacity increased progressively in passing down the small intestine, but was highest in the pyloric ceca. 3. 3. Activity was greatest with respect to hydrolysis of glycyl-leucine, intermediate with glycyl-phenylalanine and lowest with phenylalanyl-glycine. 4. 4. The N-terminal glycyl dipeptides were predominantly hydrolysed by cytoplasmic enzymes whilst phenylalanyl-glycine hydrolysis was largely a function of brush-border enzymes. 5. 5. K m values, pH optima and responses to cations are presented for each dipeptide hydrolysing system.
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