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PEP group translocation
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== Specificity == The phosphotransferase system is involved in transporting many sugars into bacteria, including [[glucose]], [[mannose]], [[fructose]] and [[cellobiose]]. '''PTS''' sugars can differ between bacterial groups, mirroring the most suitable carbon sources available in the environment every group evolved. In ''[[Escherichia coli]]'', there are 21 different transporters (i.e. IIC proteins, sometimes fused to IIA and/or IIB proteins, see figure) which determine import specificity. Of these, 7 belong to the fructose (Fru) family, 7 belong to the glucose (Glc) family, and 7 belong to the other PTS permease families.<ref>{{cite journal | vauthors = Tchieu JH, Norris V, Edwards JS, Saier MH | title = The complete phosphotransferase system in Escherichia coli | journal = Journal of Molecular Microbiology and Biotechnology | volume = 3 | issue = 3 | pages = 329β46 | date = July 2001 | pmid = 11361063 }}</ref>
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