New insights into the substrate specificities of proton-coupled oligopeptide transporters from E. coli by a pH sensitive assay
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Bala Krishna Prabhala, Nanda Gowtham Aduri, Johanne Mørch Jensen, Heidi Asschenfeldt Ernst, Nida Iram, Moazur Rahman, Osman Asghar Mirza
Proton-coupled oligopeptide transporters (POTs) are secondary active transporters that facilitate di- and tripeptide uptake by coupling it to an inward directed proton electrochemical gradient. Here the substrate specificities of E. coli POTs YdgR, YhiP and YjdL were investigated by means of a label free transport assay using the hydrophilic pH sensitive dye pyranine and POT overexpressing E. coli cells. The results confirm and extend the functional knowledge on E. coli POTs. In contrast to previous assumptions, alanine and trialanine appears to be substrates of YjdL, albeit poor compared to dipeptides. Similarly tetraalanine apparently is a substrate of both YdgR and YhiP.
|Publication status||Published - 16 Jan 2014|