大肠杆菌K 12的外膜(outer membrane)含有一套主要蛋白,称为孔蛋白(porins),它们形成穿膜孔道,可允许小的亲水分子通过。在大肠杆菌K 12的外膜上有两种主要孔蛋白OmpC和OmpF。两者在膜上的相对量与生长条件有关。过去认为OmpF和OmpC的表达是受ompB突变点所产生蛋白 The outer membrane of E. coli K12 contains a set of major proteins, called porins, that form tunneling channels that allow small hydrophilic molecules to pass through. There are two major porins OmpC and OmpF on the outer membrane of E. coli K12. The relative amount of both in the membrane and growth conditions. In the past, OmpF and OmpC were thought to be expressed by the ompB mutation