[Principles of integration of cell metabolism].

The notion of the "primary blocks" of cellular metabolism (designated as "metabolic system") has been introduced. Metabolic system is defined as a metabolic pathway which corresponds to the really existing multienzyme complex. The complex of glycolytic enzymes which catalyzes the anaerobic reduction of glucose-6-phosphate with production of ATP may serve as an example of metabolic system (this complex does not contain hexokinase). The complex is formed on thin filaments of I-band of the muscle fibers or on dimers of band 3 protein embedded in the erythrocyte membranes. The fixation of the multienzyme complex to the support of biological nature provides the material basis for regulation of the metabolic system by chemical signals produced by the higher levels of metabolic control. Owing to interaction with anchor protein of the support the chemical signals exert the general control of functioning the multienzyme complex (switching on--switching-off of the metabolic system). It is assumed that the glycolytic system in skeletal muscles is stimulated by Ca2+ ions which interact with the anchor protein of the support (troponin C).