The Ecoli phosphotransferase system transports glucose into

The E.coli phosphotransferase system transports glucose into the cell by:

A. serving as a carrier protein that pumps glucose into the cell in an energy-dependent manner against its concetration gradient

B. serving as a carrier protein that pumps glucose into the cell in an energy-independent manner againsr its concentration gradient

C. keeping levels of intracellular glucose very low by efficiently phosphorylating intacellular glucose in an energy-dependent set of reactions

D. keeping levels of intracellular glucose very low by efficiently phosphorylating intacellular glucose in a set of spontaneous reactions

E. none of the above

Solution

E.coli preferentially utilize sugar substrates of the phosphoenolpyruvate-glucose phosphotransferase system or the PTS system in the presence of other sugars on the growth medium and this phenomenon is called as diauxic growth. This is regulated by a gene that encodes for the PTS protein III^Glc .

This is surely an ATP dependent procedure and hence the correct answer would be option A.