Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 285, Issue 48, Pages 37741-37752Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M110.165407
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Funding
- Wellcome Trust [081569/Z/06/Z]
- Advantage West Midlands through the Birmingham Science City Translational Medicine Platform
- James Bardrick
- Royal Society
- MRC [G0500590] Funding Source: UKRI
- Wellcome Trust [081569/Z/06/Z] Funding Source: Wellcome Trust
- Medical Research Council [G0500590] Funding Source: researchfish
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Long term survival of the pathogen Mycobacterium tuberculosis in humans is linked to the immunomodulatory potential of its complex cell wall glycolipids, which include the phosphatidylinositol mannoside (PIM) series as well as the related lipomannan and lipoarabinomannan glycoconjugates. PIM biosynthesis is initiated by a set of cytosolic alpha-mannosyltransferases, catalyzing glycosyl transfer from the activated saccharide donor GDP-alpha-D-mannopyranose to the acceptor phosphatidyl-myoinositol (PI) in an ordered and regio-specific fashion. Herein, we report the crystal structure of mannosyltransferase Corynebacterium glutamicum PimB' in complex with nucleotide to a resolution of 2.0 A. PimB' attaches mannosyl selectively to the 6-OH of the inositol moiety of PI. Two crystal forms and GD-Pversus GDP-alpha-D-mannopyranose-bound complexes reveal flexibility of the nucleotide conformation as well as of the structural framework of the active site. Structural comparison, docking of the saccharide acceptor, and site-directed mutagenesis pin regio-selectivity to a conserved Asp residue in the N-terminal domain that forces presentation of the correct inositol hydroxyl to the saccharide donor.
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