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Taxonomic group: plant / Streptophyta (Phylum: Streptophyta)
Organ / tissue: pistil

NCBI PubMed ID: 8563138
Publication DOI: 10.1093/glycob/5.5.517
Journal NLM ID: 9104124
Publisher: IRL Press at Oxford University Press
Institutions: Plant Cell Biology Research Centre, School of Botany, University of Melbourne, Parkville, Australia

Gametophytic self-incompatibility, a mechanism that prevents inbreeding in some families of flowering plants, is mediated by the products of a single genetic locus, the S-locus. The products of the S-gene in the female sexual tissues of Nicotiana alata are an allelic series of glycoproteins with RNase activity. In this study, we report on the microheterogeneity of N-linked glycosylation at the four potential N-glycosylation sites of the S2-glycoprotein. The S-glycoproteins from N.alata contain from one to five potential N-glycosylation sites based on the consensus sequence Asn-Xaa-Ser/Thr. The S2-glycoprotein contains four potential N-glycosylation sites at Asn27, Asn37, Asn38 and Asn 150, designated sites I, II, IV and V, respectively. Site III is absent from the S2-glycoprotein. Analysis of glycopeptides generated from the S2-glycoprotein by trypsin and chymotrypsin digestions revealed the types of glycans and the degree of microheterogeneity present at each site. Sites I (Asn27) and IV (Asn138) display microheterogeneity, site II (Asn37) contains only a single type of N-glycan, and site V (Asn150) is not glycosylated. The microheterogeneity observed at site I on the S2-glycoprotein is the same as that observed at the only site, site I, on the S1-glycoprotein (Woodward et al., Glycobiology, 2, 241-250, 1992). Since the N-glycosylation consensus sequence at site I is conserved in all S-glycoproteins from other species of self-incompatible solanaceous plants, glycosylation at this site may be important to their function. No other post-translational modifications (e.g. O-glycosylation, phosphorylation) were detected on the S2-glycoprotein.

Structure type: oligomer ; 1114.0
Location inside paper: Fig. 1, structure a1
Compound class: N-glycan
Contained glycoepitopes: IEDB_123886,IEDB_130701,IEDB_135813,IEDB_137340,IEDB_137485,IEDB_141793,IEDB_141807,IEDB_144983,IEDB_151531,IEDB_152206,IEDB_153212,IEDB_548907,IEDB_983930,SB_197,SB_198,SB_33,SB_44,SB_67,SB_72,SB_73,SB_74,SB_85

Methods: FAB-MS, MALDI-MS, amino acid analysis, HPLC, enzymatic digestion, FPLC, methylation analysis, Edman sequencing

NCBI Taxonomy refs (TaxIDs): 4087
Reference(s) to other database(s): GTC:G70073SG, CCSD:47045, CBank-STR:15009
Show glycosyltransferases

There is only one chemically distinct structure:

CC(=O)N[C@H]1C(O)O[C@H](CO)[C@@H](O[C@@H]2O[C@H](CO)[C@@H](O[C@@H]3O[C@H](CO[C@H]4O[C@H](CO)[C@@H](O)[C@H](O)[C@@H]4O)[C@@H](O)[C@H](O[C@H]4O[C@H](CO)[C@@H](O)[C@H](O)[C@@H]4O[C@@H]4O[C@H](CO)[C@@H](O)[C@H](O)[C@H]4NC(C)=O)[C@@H]3O)[C@H](O)[C@H]2NC(C)=O)[C@@H]1O

SVG MW SMILES 3D mol Ionize

Structure type: oligomer ; 1043.0
Location inside paper: Fig. 1, structure a2
Compound class: N-glycan
Contained glycoepitopes: IEDB_114701,IEDB_123886,IEDB_123887,IEDB_130701,IEDB_135813,IEDB_137340,IEDB_137485,IEDB_141793,IEDB_141807,IEDB_144983,IEDB_145668,IEDB_148491,IEDB_148492,IEDB_151531,IEDB_152206,IEDB_153212,IEDB_167188,IEDB_174332,IEDB_548907,IEDB_983930,SB_197,SB_198,SB_33,SB_44,SB_67,SB_72,SB_73,SB_74,SB_85

Methods: FAB-MS, MALDI-MS, amino acid analysis, HPLC, enzymatic digestion, FPLC, methylation analysis, Edman sequencing

NCBI Taxonomy refs (TaxIDs): 4087
Reference(s) to other database(s): GTC:G80513FH, CCSD:47046, CBank-STR:14603
Show glycosyltransferases

There is only one chemically distinct structure:

CC(=O)N[C@H]1C(O)O[C@H](CO)[C@@H](O[C@@H]2O[C@H](CO)[C@@H](O[C@@H]3O[C@H](CO[C@H]4O[C@H](CO)[C@@H](O)[C@H](O)[C@@H]4O)[C@@H](O)[C@H](O[C@H]4O[C@H](CO)[C@@H](O)[C@H](O)[C@@H]4O)[C@@H]3O[C@@H]3OC[C@@H](O)[C@H](O)[C@H]3O)[C@H](O)[C@H]2NC(C)=O)[C@@H]1O

SVG MW SMILES 3D mol Ionize

Structure type: oligomer ; 1246.1
Location inside paper: Fig. 1, structure b
Compound class: N-glycan
Contained glycoepitopes: IEDB_114701,IEDB_123886,IEDB_123887,IEDB_130701,IEDB_135813,IEDB_137340,IEDB_137485,IEDB_141793,IEDB_141807,IEDB_144983,IEDB_145668,IEDB_148491,IEDB_148492,IEDB_151531,IEDB_152206,IEDB_153212,IEDB_167188,IEDB_174332,IEDB_548907,IEDB_983930,SB_197,SB_198,SB_33,SB_44,SB_67,SB_72,SB_73,SB_74,SB_85

Methods: FAB-MS, MALDI-MS, amino acid analysis, HPLC, enzymatic digestion, FPLC, methylation analysis, Edman sequencing

NCBI Taxonomy refs (TaxIDs): 4087
Reference(s) to other database(s): GTC:G69195IF, CCSD:47047, CBank-STR:16137
Show glycosyltransferases

There is only one chemically distinct structure:

CC(=O)N[C@H]1C(O)O[C@H](CO)[C@@H](O[C@@H]2O[C@H](CO)[C@@H](O[C@@H]3O[C@H](CO[C@H]4O[C@H](CO)[C@@H](O)[C@H](O)[C@@H]4O)[C@@H](O)[C@H](O[C@H]4O[C@H](CO)[C@@H](O)[C@H](O)[C@@H]4O[C@@H]4O[C@H](CO)[C@@H](O)[C@H](O)[C@H]4NC(C)=O)[C@@H]3O[C@@H]3OC[C@@H](O)[C@H](O)[C@H]3O)[C@H](O)[C@H]2NC(C)=O)[C@@H]1O

SVG MW SMILES 3D mol Ionize

Structure type: oligomer
Location inside paper: Fig. 1, structure c
Compound class: N-glycan
Contained glycoepitopes: IEDB_114701,IEDB_123886,IEDB_123887,IEDB_130701,IEDB_135813,IEDB_137340,IEDB_137485,IEDB_140116,IEDB_141793,IEDB_141807,IEDB_144983,IEDB_145668,IEDB_148491,IEDB_148492,IEDB_151531,IEDB_152206,IEDB_153212,IEDB_164174,IEDB_167188,IEDB_174332,IEDB_548907,IEDB_983930,SB_197,SB_198,SB_33,SB_44,SB_67,SB_72,SB_73,SB_74,SB_77,SB_85

Methods: FAB-MS, MALDI-MS, amino acid analysis, HPLC, enzymatic digestion, FPLC, methylation analysis, Edman sequencing

NCBI Taxonomy refs (TaxIDs): 4087
Reference(s) to other database(s): GTC:G90248IA, CCSD:47048, CBank-STR:17217
Show glycosyltransferases

There is only one chemically distinct structure:

CC(=O)N[C@H]1C(O)O[C@H](CO)[C@@H](O[C@@H]2O[C@H](CO)[C@@H](O[C@@H]3O[C@H](CO[C@H]4O[C@H](CO)[C@@H](O)[C@H](O[C@H]5O[C@H](CO)[C@@H](O)[C@H](O)[C@@H]5O)[C@@H]4O)[C@@H](O)[C@H](O[C@H]4O[C@H](CO)[C@@H](O)[C@H](O)[C@@H]4O[C@@H]4O[C@H](CO)[C@@H](O)[C@H](O)[C@H]4NC(C)=O)[C@@H]3O[C@@H]3OC[C@@H](O)[C@H](O)[C@H]3O)[C@H](O)[C@H]2NC(C)=O)[C@@H]1O

SVG MW SMILES 3D mol Ionize