TRANSPORT KINETICS: HISTORICAL AND MODERN CONCEPTS. MECHANISMS OF COUPLING TRANSPORT REACTIONS. SYMPORT AND ANTIPORT MECHANISMS; USE OF ION GRADIENT ENERGY. ENERGY TRANSDUCTION IN CELL MEMBRANES

Abstract

This work covers the theoretical foundations of metabolic processes through cell membranes, the historical development and modern interpretations of transport kinetics. The kinetic laws of membrane transport rates, the selectivity of carrier proteins, and their enzyme-like mechanical properties are scientifically analyzed. The main types of mechanisms for coupling transport reactions - primary active transport dependent on ATP energy and secondary active transport mechanisms carried out at the expense of the ion gradient - are considered in detail. The molecular principle of operation of symport and antiport systems, the process of using the electrochemical gradient of ions and their significance for the cell are explained. The role of the proton gradient in the energy cycle (transduction) in cell membranes, in particular, in the processes of oxidative phosphorylation in mitochondria and photophosphorylation in chloroplasts, is also revealed. The topic creates an important theoretical basis for understanding the fundamental mechanisms of cellular energetics, metabolism, and membrane dynamics.