See our Technology Page to find out how. This chapter aims to describe a few of the ways that proteins interact with each other and with other large molecules in cells. Protein-Protein Interactions Proteins are directed to the correct compartments of cells by binding to other proteins. Protein messengers bind to protein receptors on the outer surface of cell membranes to send signals between cells.
Proteins form structural connections between cells.
Some inhibitors of enzymes are proteins. Proteins are modified and degraded by enzymes. Interactions between different protein subunits are the basis of allosteric changes in multimers. In fact we mean just about all the cellular machinery for synthesis, replication, manipulation, modification, and degradation. The turnover of protein is more than simply their proteolysis.