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Orbitrap_SciLib
Reputable Mentor II
Reputable Mentor II
Steentoft C, Vakhrushev SY, Vester-Christensen MB, Schjoldager KT, Kong Y, Bennett EP, Mandel U, Wandall H, Levery SB, Clausen H.
Nat Methods. 2011 Oct 9;8(11):977-82.
Zinc-finger nuclease (ZFN) gene targeting is emerging as a versatile tool for engineering of multiallelic gene deficiencies. A longstanding obstacle for detailed analysis of glycoproteomes has been the extensive heterogeneities in glycan structures and attachment sites. Here we applied ZFN targeting to truncate the O-glycan elongation pathway in human cells, generating stable 'SimpleCell' lines with homogenous O-glycosylation. Three SimpleCell lines expressing only truncated GalNAcα or NeuAcα2-6GalNAcα O-glycans were produced, allowing straightforward isolation and sequencing of GalNAc O-glycopeptides from total cell lysates using lectin chromatography and nanoflow liquid chromatography-mass spectrometry (nLC-MS/MS) with electron transfer dissociation fragmentation. We identified >100 O-glycoproteins with >350 O-glycan sites (the great majority previously unidentified), including a GalNAc O-glycan linkage to a tyrosine residue. The SimpleCell method should facilitate analyses of important functions of protein glycosylation. The strategy is also applicable to other O-glycoproteomes.

http://www.nature.com/nmeth/journal/v8/n11/full/nmeth.1731.html
Copenhagen Center for Glycomics, Department of Cellular and Molecular Medicine, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark.
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