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Additional resources for Current Topics in Microbiology and Immunology 129
1 Genetics and Functions of the Five Cell Envelope Proteins Involved in MaltosefMaltodextrin Transport The maltosejmaltodextrin transport system is very efficient. It allows rapid uptake of bulky substrates (up to 1260 daltons) at low external concentration (Km = 1-2 ~M; Vmax= 500 pmol min -1 per 3 x 10- 7 cells). Accumulation factors of the unmodified substrate up to 1: 10 5 inside the cell can be achieved. The system is comprised of five different proteins localized in three different layers of the cell envelope: the outer membrane, the periplasmic space, and the inner membrane (see Fig.
1983). The finding that outer membrane protein synthesis is reduced by mutations which affect initiation of export clearly demonstrates that synthesis and export are tightly coupled. Signal sequence mutations crossed into a wild-type lamB gene block the export of LamB. Cells carrying these mutations are therefore unable to grow on dextrins. Using such Dex- strains, and comparable malE signal sequence mutations (Mal-), it has been possible to identify second-site mutations that suppress the Dex - and Mal- phenotypes (reviewed in BENSON et al.
The maltose transport system. The genetic organization of the malB region as well as the localization and the interaction of malB gene products is shown. The malB region consists of two divergent operons transcribed from promoters PL and PRo The malE gene codes for MBP, lamB codes for maltoporin (or A. receptor), and malF, G, K code for the cytoplasmic membrane components of the transport system. The molA gene, whose function is unknown, is expressed as part of the malK-lamB operon (GILSON 1983).