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In molecular biology , the OmpA domain is a conserved protein domain with a beta / alpha / beta  /  alpha-beta -LRB- 2 -RRB- structure found in the C-terminal region of many Gram-negative bacterial outer membrane proteins , such as porin-like integral membrane proteins -LRB- such as ompA -RRB- , small lipid-anchored proteins -LRB- such as pal -RRB- , and MotB proton channels .. conserved. Conserved sequence. protein domain. protein domain. structure. secondary structure. C-terminal. C-terminal. porin. Porin ( protein ). proteins. proteins. The N-terminal half of these proteins is variable although some of the proteins in this group have the OmpA-like transmembrane domain at the N terminus .. N-terminal. N-terminal. proteins. proteins. OmpA-like transmembrane domain. OmpA-like transmembrane domain. OmpA from Escherichia coli is required for pathogenesis , and can interact with host receptor molecules .. Escherichia coli. Escherichia coli. pathogenesis. pathogenesis. receptor. receptor ( biochemistry ). MotB -LRB- and MotA -RRB- serve two functions in E. coli , the MotA -LRB- 4 -RRB- - MotB -LRB- 2 -RRB- complex attaches to the cell wall via MotB to form the stator of the flagellar motor , and the MotA-MotB complex couples the flow of ions across the cell membrane to movement of the rotor .. complex. Protein complex. cell wall. cell wall. stator. stator. flagellar. Flagellum. cell membrane. cell membrane