Linked Life Data

2456913

Source:http://linkedlifedata.com/resource/pubmed/id/2456913

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pubmed-article:2456913pubmed:abstractTextWe have determined the structures of high mannose (Man) oligosaccharide units at individual glycosylation sites of mouse TSH. Mouse thyrotropic tumor tissue was incubated with D-[2-3H]Man with or without [14C]tyrosine ([14C] Tyr) for 2, 3, or 6 h, and for a 3-h pulse followed by a 2-h chase. TSH heterodimers or free alpha-subunits were obtained from homogenates using specific antisera. After reduction and alkylation, subunits were treated with trypsin. The tryptic fragments were then loaded on a reverse phase HPLC column to separate tryptic fragments bearing labeled oligosaccharides. The N-linked oligosaccharides were released with endoglycosidase-H and analyzed by paper chromatography. Man9GlcNac2 and Man8GlcNac2 units predominated at each time point and at each specific glycosylation site, but the processing of high Man oligosaccharides differed at each glycosylation site. The processing at Asn23 of TSH beta-subunits was slower than that at Asn56 or Asn82 of alpha-subunits. The processing at Asn82 was slightly faster than that at Asn56 for both alpha-subunits of TSH heterodimers and free alpha-subunits. The present study demonstrates that the early processing of oligosaccharides differs at the individual glycosylation sites of TSH and free alpha-subunits, perhaps because of local conformational differences.lld:pubmed
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pubmed-article:2456913pubmed:authorpubmed-author:MiuraYYlld:pubmed
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pubmed-article:2456913pubmed:pagination1296-302lld:pubmed
pubmed-article:2456913pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:2456913pubmed:articleTitleRates of processing of the high mannose oligosaccharide units at the three glycosylation sites of mouse thyrotropin and the two sites of free alpha-subunits.lld:pubmed
pubmed-article:2456913pubmed:affiliationDivision of Endocrinology, Michael Reese Hospital, University of Chicago, Illinois 60616.lld:pubmed
pubmed-article:2456913pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:2456913pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed