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J Bacteriol. 1980 October; 144(1): 274-278

Substrate specificity and transport properties of the glycerol facilitator of Escherichia coli.

K B Heller, E C Lin and T H Wilson

ABSTRACT

The specificity of the glycerol facilitator (glpF) of Escherichia coli was studied with an osmotic method. This transport system allowed the entry of polyols (glycerol and erythritol), pentitols, and hexitols. The analogous sugars were not transported. However, urea, glycine, and DL-glyceraldehyde could use this pathway to enter the cell. The glpF protein allowed the rapid efflux of preequilibrated xylitol. Glycerol surprisingly did not inhibit the uptake of xylitol, and xylitol only slightly reduced the uptake of glycerol. The observation and the insensitivity of the xylitol transport to low temperature suggest that the facilitator behaves as a membrane channel.


J Bacteriol. 1980 October; 144(1): 274-278




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