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The functional O-mannose glycan on α-dystroglycan contains a phospho-ribitol primed for matriglycan addition.

Jeremy L Praissman | Tobias Willer | M Osman Sheikh | Ants Toi | David Chitayat | Yung-Yao Lin | Hane Lee | Stephanie H Stalnaker | Shuo Wang | Pradeep Kumar Prabhakar | Stanley F Nelson | Derek L Stemple | Steven A Moore | Kelley W Moremen | Kevin P Campbell | Lance Wells
eLife | 2016

Multiple glycosyltransferases are essential for the proper modification of alpha-dystroglycan, as mutations in the encoding genes cause congenital/limb-girdle muscular dystrophies. Here we elucidate further the structure of an O-mannose-initiated glycan on alpha-dystroglycan that is required to generate its extracellular matrix-binding polysaccharide. This functional glycan contains a novel ribitol structure that links a phosphotrisaccharide to xylose. ISPD is a CDP-ribitol (ribose) pyrophosphorylase that generates the reduced sugar nucleotide for the insertion of ribitol in a phosphodiester linkage to the glycoprotein. TMEM5 is a UDP-xylosyl transferase that elaborates the structure. We demonstrate in a zebrafish model as well as in a human patient that defects in TMEM5 result in muscular dystrophy in combination with abnormal brain development. Thus, we propose a novel structure-a ribitol in a phosphodiester linkage-for the moiety on which TMEM5, B4GAT1, and LARGE act to generate the functional receptor for ECM proteins having LG domains.

Pubmed ID: 27130732

Associated grants

  • Agency: NINDS NIH HHS, United States
    Id: RC2 NS069521
  • Agency: NIGMS NIH HHS, United States
    Id: R01 GM111939
  • Agency: NINDS NIH HHS, United States
    Id: U54 NS053672
  • Agency: NIGMS NIH HHS, United States
    Id: P41 GM103390
  • Agency: NIGMS NIH HHS, United States
    Id: P41 GM103490
  • Agency: NIGMS NIH HHS, United States
    Id: P01 GM107012

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SAMTOOLS (tool)

RRID:SCR_002105

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RRID:SCR_001876

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RRID:SCR_014818

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RRID:SCR_013575

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RRID:CVCL_0045

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