Influence of the amino acid sequence on the MUC5AC motif peptide O-glycosylation by human gastric UDP-GalNAc:polypeptide N-acetylgalactosaminyltransferase(s). 1998

S Hennebicq, and D Tetaert, and B Soudan, and A Boersma, and G Briand, and C Richet, and J Gagnon, and P Degand
Unité INSERM N 377, Lille, France.

The present work was carried out to study the role of the peptide moiety in the addition of O-linked N-acetylgalactosamineto human apomucin using human crude microsomal homogenates from gastric mucosa (as enzyme source) and a series of peptide acceptors representative of tandem repeat domains deduced from the MUC5AC mucin gene (expressed in the gastric mucosa). Being rich in threonine and serine placed in clusters, these peptides provided several potential sites for O-glycosylation. The glycosylated products were analysed by a combination of electrospray mass spectrometry and capillary electrophoresis in order to isolate the glycopeptides and to determine their sequence by Edman degradation. The O-glycosylation of our MUC5AC motif peptides gave information on the specificity and activity of the gastric microsomal UDP-N-acetylgalactosamine:polypeptide N-acetylgalactosaminyltransferase(s). The proline residues and the induced-conformations are of great importance for the recognition of MUC5AC peptides but they are not the only factors for the choice of the O-glycosylation sites. Moreover, for the di-glycosylated peptides, the flanking regions of the proline residues strongly influence the site of the second O-glycosylation.

UI MeSH Term Description Entries
D008861 Microsomes Artifactual vesicles formed from the endoplasmic reticulum when cells are disrupted. They are isolated by differential centrifugation and are composed of three structural features: rough vesicles, smooth vesicles, and ribosomes. Numerous enzyme activities are associated with the microsomal fraction. (Glick, Glossary of Biochemistry and Molecular Biology, 1990; from Rieger et al., Glossary of Genetics: Classical and Molecular, 5th ed) Microsome
D008969 Molecular Sequence Data Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories. Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D009077 Mucins High molecular weight mucoproteins that protect the surface of EPITHELIAL CELLS by providing a barrier to particulate matter and microorganisms. Membrane-anchored mucins may have additional roles concerned with protein interactions at the cell surface. Mucin
D009842 Oligopeptides Peptides composed of between two and twelve amino acids. Oligopeptide
D011487 Protein Conformation The characteristic 3-dimensional shape of a protein, including the secondary, supersecondary (motifs), tertiary (domains) and quaternary structure of the peptide chain. PROTEIN STRUCTURE, QUATERNARY describes the conformation assumed by multimeric proteins (aggregates of more than one polypeptide chain). Conformation, Protein,Conformations, Protein,Protein Conformations
D005753 Gastric Mucosa Lining of the STOMACH, consisting of an inner EPITHELIUM, a middle LAMINA PROPRIA, and an outer MUSCULARIS MUCOSAE. The surface cells produce MUCUS that protects the stomach from attack by digestive acid and enzymes. When the epithelium invaginates into the LAMINA PROPRIA at various region of the stomach (CARDIA; GASTRIC FUNDUS; and PYLORUS), different tubular gastric glands are formed. These glands consist of cells that secrete mucus, enzymes, HYDROCHLORIC ACID, or hormones. Cardiac Glands,Gastric Glands,Pyloric Glands,Cardiac Gland,Gastric Gland,Gastric Mucosas,Gland, Cardiac,Gland, Gastric,Gland, Pyloric,Glands, Cardiac,Glands, Gastric,Glands, Pyloric,Mucosa, Gastric,Mucosas, Gastric,Pyloric Gland
D006031 Glycosylation The synthetic chemistry reaction or enzymatic reaction of adding carbohydrate or glycosyl groups. GLYCOSYLTRANSFERASES carry out the enzymatic glycosylation reactions. The spontaneous, non-enzymatic attachment of reducing sugars to free amino groups in proteins, lipids, or nucleic acids is called GLYCATION (see MAILLARD REACTION). Protein Glycosylation,Glycosylation, Protein
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000097763 Polypeptide N-acetylgalactosaminyltransferase Family of enzymes that catalyze the formation of GalNAcAlpha1-serine/threonine linkages in glycoproteins. Galactosylgalactosylglucosylceramide beta-D-acetylgalactosaminyltransferase,Globoside Synthase,Globoside beta GalNAc Transferase,Protein-UDPacetylgalactosaminyltransferase,(1-3)-N-acetyl-beta-galactosaminyltransferase,(1-4)-N-acetyl-beta-D-galactosaminyltransferase,4-GalNActransferase,GalNAc-T1,GalNAc-T10,GalNAc-T2,GalNAc-T3,GalNAc-T4,GalNAc-T5,GalNAc-T8,GalNAc-transferase,GalNAcT-1,GalNAcT-2,GalNAcT-4,GalNAcT-8,UDP-GPAGAT,UDP-GalNAc-beta-galactose beta 1,4-N-acetylgalactosaminyltransferase,UDP-GalNAc-polypeptide N-acetylgalactosaminyltransferase,UDP-N-acetyl-D-galactosamine polypeptide N-acetylgalactosaminyltransferase-T4,UDP-N-acetylgalactosamine mucin transferase,UDP-N-acetylgalactosamine-beta-galactose beta 1,4-N-acetylgalactosaminyltransferase,UDP-N-acetylgalactosamine-globoside beta-N-acetylgalactosaminyltransferase,UDP-N-acetylgalactosamine-globosidetriaosylceramide beta-3-N-acetylgalactosaminyltransferase,UDP-N-acetylgalactosamine-polypeptide N-acetylgalactosamine transferase,UDPacetylgalactosamine-galactosyl-galactosyl-glucosylceramide beta-N-acetyl-D-galactosaminyltransferase,UDPacetylgalactosamine-protein acetylgalactosaminyltransferase,beta-1,4-N-acetylgalactosaminyltransferase,beta-N-acetylgalactosaminyltransferase,beta1,6N-acetylgalactosaminyltransferase,polypeptide N-acetylgalactosaminyltransferase 1,polypeptide N-acetylgalactosaminyltransferase 10,polypeptide N-acetylgalactosaminyltransferase 2,polypeptide N-acetylgalactosaminyltransferase 3,polypeptide N-acetylgalactosaminyltransferase 4,polypeptide N-acetylgalactosaminyltransferase 5,polypeptide N-acetylgalactosaminyltransferase 8,pp-GalNAc-T10,ppGalNAc-T,Synthase, Globoside
D000595 Amino Acid Sequence The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION. Protein Structure, Primary,Amino Acid Sequences,Sequence, Amino Acid,Sequences, Amino Acid,Primary Protein Structure,Primary Protein Structures,Protein Structures, Primary,Structure, Primary Protein,Structures, Primary Protein

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