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2.4.1.346
physiological function
both mannosyltransferases PimA and PimB' (MSMEG_4253) recognize phosphatidyl-myo-inositol as a lipid acceptor. PimA specifically catalyzes the transfer of a mannopyranosyl residue to the 2-position of the myo-inositol ring of phosphatidylinositol, whereas PimB' exclusively transfers to the 6-position. PimB' can catalyze the transfer of a mannopyranosyl residue onto the phosphatidylinositol-monomannoside (PIM1) product of PimA, while PimA is unable in vitro to transfer mannopyranosyl onto the PIM1 product of PimB'
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704533
2.4.1.346
physiological function
characterization of a PimB MgtA double deletion mutant. Gene product of Rv2188c acts as an Ac1PIM1:mannosyltransferase PimB and the product of Rv0557 acts as a GlcAGroAc2:mannosyltransferase MgtA
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740615
2.4.1.346
physiological function
disruption of gene NCgl2106 results in a mutant devoid of monoacylated phosphatidyl-myo-inositol dimannoside (Ac1PIM2) resulting in the accumulation of monoacylated phosphatidyl-myo-inositol monomannoside Ac1PIM1 and cessation of phosphatidyl-myo-inositol based lipomannan and lipoarabinomannan biosynthesis. The mutant syntheses a single novel lipoglycan possessing an alpha-D-glucopyranosyluronic acid-(1->3)-glycerol (GlcAGroAc2) based anchor which is then further glycosylated by 822 mannose residues, with Man1220GlcAGroAC2 molecular species being the most abundant
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739869
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