Lipoarabinomannan carrier protein LprG

UniProtKB accession:  P9WK45

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Probably helps membrane protein Rv1410c (P55) transport triacylglycerides (TAG) across the inner cell membrane into the periplasm; TAG probably regulates lipid metabolism and growth regulation (PubMed:26751071). Binds TAG and transfers it between lipid bilayers, probably to the outer membrane in vivo (PubMed:26751071). Binds di- and triacylated phosphatidyl-myo-inositol mannosides (PIMs), and glycolipid lipoglycan modulins lipoarabinomannan (LAM) and lipomannan (LM), facilitating their recognition by TLR2 (PubMed:20694006, PubMed:25356793). Binds LM > PIM6 > ManLAM > PI-LAM > PIM2 (mannose-capped LAM and phospho-myo-inositol-capped LAM, E.coli expressed without acyl-groups); deacylated LM and LAM also bind to this protein via their mannose moieties, showing LprG has at least 2 different ways to bind glycolipids (PubMed:25356793). Binds triacylglycerides (TAG) in the same cavity, is able to transfer TAG between lipid bilayers (PubMed:26751071). Overexpression of LprG and Rv1410c leads to increased levels of TAG in the culture medium (PubMed:26751071). Required for Rv1410c-mediated export of drugs (PubMed:18156250, PubMed:21762531). Required, probably with Rv1410c, for normal surface localization of LAM (PubMed:25232742).