Purification of the O-Glycosylated Protein p135 and Identification as O -GlcNAc Transferase
Biochemical and Biophysical Research Communications, ISSN: 0006-291X, Vol: 288, Issue: 5, Page: 1136-1140
2001
- 22Citations
- 22Captures
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Metrics Details
- Citations22
- Citation Indexes22
- CrossRef22
- 22
- Captures22
- Readers22
- 22
Article Description
We have previously shown that rat pancreatic islets contain a predominant 135 kDa O-glycosylated protein (p135) that is recognized by immunoprecipitation and Western blotting with anti- O -GlcNAc antibody. In this paper, we show that p135 is also detectable in other rat tissues including brain, heart, liver, spleen, and lung, but not kidney. To identify p135, the protein was purified from rat brain using a multistep procedure including selective absorption with anti- O -GlcNAc antibody. After electrophoresis, and Coomassie staining, the protein was excised from the gel for tryptic digestion. Next, O -methylisourea was used to convert lysine residues to homoarginine to increase the sequence coverage, and MALDI-TOF mass spectrometry detection was performed. MALDI-TOF identified p135 as rat O -GlcNAc transferase (OGT), an identity confirmed by LC/MS of individual peptides. The identification of p135 as OGT is consistent with previous reports of the tissue distribution of OGT, as well as reports that OGT is itself O-glycosylated.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0006291X01959029; http://dx.doi.org/10.1006/bbrc.2001.5902; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0035900601&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/11700029; https://linkinghub.elsevier.com/retrieve/pii/S0006291X01959029; https://dx.doi.org/10.1006/bbrc.2001.5902
Elsevier BV
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