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Hia is a trimeric autotransporter found in the outer membrane of Haemphilus influenzae. The X-ray structure of Hia translocator domain revealed each monomer to consist of an α-helix connected via a loop to a 4-stranded β-sheet, thus the topology of the trimeric translocator domain is a 12-stranded β-barrel containing 3 α-helices that protrude from the mouth of the β-barrel into the extracellular medium...
The TonB-dependent transporters mediate high-affinity binding and active transport of a variety of substrates across the outer membrane of Escherichia coli. The substrates transported by these proteins are large, scarce nutrients that are unable to gain entry into the cell by passive diffusion across the complex, asymmetric bilayer that constitutes the outer membrane. Experimental studies have identified...
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