Abstract
Gram negative bacteria contain in their outer membrane a group of proteins that have been classified into major and minor according to their level of expression (1). The major members of the outer membrane proteins (OMP) include the Braun’s lipoprotein, the porins (ompC, ompF, ompD, phoE, etc.) and the heat-modifiable protein (Omp A) (2). The porins are a group of proteins with molecular weights (Mr) ranging from 36 to 38 Kd per monomeric unit (3). In the membrane, porins are expressed as non-covalently linked homotrimers. These proteins function in the transmembrane transport of nutrients and ions (4). Moreover, some members of the porin family (lamB) function as receptors for phagi (5). Biochemical and molecular genetic studies have indicated that there is extensive homology among the porins of Gram negative bacteria, although some species-specific sequences have been demonstrated (6,7).
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