Melibiose permease

UniProtKB accession:  P30878

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UniProtKB description:  Mediates the transport of melibiose and other galactosides by a symport mechanism (PubMed:21148559, PubMed:24389923, PubMed:29054867, PubMed:34110360). Can use sodium, lithium and protons as coupling cations, with a preference for sodium and lithium (PubMed:21148559, PubMed:24389923, PubMed:29054867). The use of Na(+) as coupling ion for sugar transport is based not on ion selectivity but on competitive binding under physiological conditions, because of a much higher Na(+) concentration under physiological conditions (PubMed:29054867).