Abstract
Bacterial periplasmic transport systems are complex, multicomponent permeases, present in Gram-negative bacteria. Many such permeases have been analyzed to various levels of detail. A generalized picture has emerged indicating that their overall structure consists of four proteins, one of which is a soluble periplasmic protein that binds the substrate and the other three are membrane bound. The liganded periplasmic protein interacts with the membrane components, which presumably form a complex, and which by a series of conformational changes allow the formation of an entry pathway for the substrate. The two extreme alternatives for such pathway involve either the formation of a nonspecific hydrophilic pore or the development of a ligand-binding site(s) on the membrane-bound complex. One of the membrane-bound components from each system constitutes a family of highly homologous proteins containing sequence domains characteristic of nucleotide-binding sites. Indeed, in several cases, they have been shown to bind ATP, which is thus postulated to be involved in the energy-coupling mechanism. Interestingly, eukaryotic proteins homologous to this family of proteins have been identified (mammalianmdr genes and Drosophilawhite locus), thus indicating that they perform a universal function, presumably related to energy coupling in membrane-related processes. The mechanism of energy coupling in periplasmic permeases is discussed.
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Ames, G.FL. Structure and mechanism of bacterial periplasmic transport systems. J Bioenerg Biomembr 20, 1–18 (1988). https://doi.org/10.1007/BF00762135
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DOI: https://doi.org/10.1007/BF00762135