sn-glycerol-3-phosphate-binding periplasmic protein UgpB

UniProtKB accession:  P0AG80

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UniProtKB description:  Part of the ABC transporter complex UgpBAEC involved in sn-glycerol-3-phosphate (G3P) import (PubMed:2842304, PubMed:23013274). Can also transport glycerophosphoryl diesters, which are hydrolyzed to G3P and alcohol during transport (PubMed:2842304). The G3P moiety can be detected in the cytoplasm whereas the corresponding alcohol is usually found in the culture medium (PubMed:2842304). Binds G3P and glycerophosphocholine, but not glycerol-2-phosphate (PubMed:23013274). It was proposed by Yang et al that the complex could also transport glycerol-2-phosphate (G2P) in vivo, but as it was shown later by Wuttge et al that UgpB does not bind G2P, this transport activity is questioned (PubMed:19429609, PubMed:23013274). G2P might be converted in the periplasm to G3P before its transport (PubMed:23013274).