Comparative-molecular characterization of membrane digestion in fish and mammals

The role of different parts of enzyme-membrane complexes in relation to the digestive membrane enzymes in some fish species of varying ecology are compared with those of the rat as a representative of homoiothermic animal. The activity of enzymes in various animal species at 25 degrees C, t degrees-function, Eact, Km and Vmax for different forms of alkaline phosphatase, sucrase and maltase is described. Adaptibility to a specific temperature is determined by both the phospholipid matrix and the enzyme protein globule including its hydrophobic part; their roles in adaptation of different enzymes (carbohydrases and alkaline phosphatase) differ.