PMID:8774730

Citation	Huber, F and Erni, B (1996) Membrane topology of the mannose transporter of Escherichia coli K12. Eur. J. Biochem. 239:810-7
Abstract	The mannose transporter of the bacterial phosphotransferase system mediates carbohydrate transport across the cytoplasmic membrane concomitant with carbohydrate phosphorylation. It also functions as a receptor for bacterial chemotaxis [Adler.J. & Epstein, W. (1974) Proc. Natl Acad. Sci. USA 71. 2895-2899] and is required for infection of the cell by bacteriophage lambda where it most likely functions as a pore for penetration of phage DNA [Elliott, J. & Arber, W. (1978) Mol. & Gen. Genet. 161, 1-8]. The transporter consists of two transmembrane subunits (27-kDa IICMan and 31-kDa IIDMan) and a hydrophilic subunit (35-kDa IIABMan). Protein fusions of IICMan and IIDMan with beta-galactosidase (LacZ) and with alkaline phosphatase (PhoA) were analyzed to determine the membrane topology of the two proteins. Protein fusions were obtained by progressively deleting the manY and manZ genes from their 3' ends and ligating them to lacZ and 'phoA that lack promotor and leader sequences. Based on the analysis of 30 IICMan-PhoA. 10 IICMan-LacZ, 12 IIDMan-PhoA, and 30 IIDMan-LacZ fusions, it is predicted that IICMan has six membrane-spanning segments with the N- and C-termini on the cytoplasmic face of the membrane. IIDMan is anchored in the membrane by a single membrane-spanning segment at the end of the C-terminus, while most of the protein (250 residues) protrudes into the cytoplasm.
Links	PubMed
Keywords	Alkaline Phosphatase/genetics; Amino Acid Sequence; Base Sequence; Cell Polarity; Escherichia coli/chemistry; Escherichia coli/genetics; Lac Operon; Membrane Proteins/chemistry; Membrane Proteins/genetics; Models, Molecular; Molecular Sequence Data; Phosphoenolpyruvate Sugar Phosphotransferase System/chemistry; Phosphoenolpyruvate Sugar Phosphotransferase System/genetics; Recombinant Fusion Proteins; Sequence Deletion; Sequence Homology, Amino Acid
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
ECOLI:PTND	part_of	GO:0005887: integral component of plasma membrane	ECO:0000255: match to sequence model evidence used in manual assertion		C		Seeded From UniProt	Missing: with/from
ECOLI:PTND		GO:0005887: integral to plasma membrane	ECO:0000255:	PMID:7108955	C		Fig. 1B shows the hydropathy plot of the protein, indicating it is located in the plasma membrane.	complete CACAO 8777
ECOLI:PTNC		GO:0005887: integral to plasma membrane	ECO:0000255:	PMID:7108955	C		Fig. 1A shows the hydropathy plot, indicating this protein is located in the plasma membrane.	complete CACAO 8776
ECOLI:PTNC	part_of	GO:0005887: integral component of plasma membrane	ECO:0000255: match to sequence model evidence used in manual assertion		C		Seeded From UniProt	Missing: with/from

References

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