Protein Complexes Exhibiting ATPase Activities in Plasma Membranes of Marine Unicellular Microalga Tetraselmis viridis

摘要

Most cellular processes require a concerted action of several enzymes. These enzymes are associated in large protein complexes, temporary or permanent. Such organization of proteins increases the efficiency, specificity, and rate of reactions in living cells. Not only cytoplasmic proteins but also many of the proteins that function in cell membranes are components of supramolecular protein complexes. Examples of such protein assemblies are the oxidative phosphoryla-tion system of mitochondrial and bacterial membranes, ATP synthases of various coupling membranes (F-type ATPases), membrane V-type ATPases, and protein supercomplexes of thylakoid membranes of chloroplasts [ 1 ]. Protein associations of the eukaryotic plasma membrane are also known, for example, the plasma membrane NADPH oxidoreductase of animal and plant cells [2].