[Inter-protein distances in biomembranes: geometric models]

The "geometrical" method for estimation of protein-to-protein distances in biomembranes is suggested. It is shown that in the membranes of the rabbit muscle sarcoplasmic reticulum the molecules of Ca2+-ATPase are separated by no more than 22.5 A, and the distance between the proteins of the inner membrane of rat liver mitochondria does not exceed 17.6 A.