Fmoc-L-Thr(((Ac)4-β-D-Gal-O-(Ac)3-α-D-GalNAc)-OH is an Fmoc-protected L-threonine amino acid derivative bearing a complex, fully acetylated glycosyl substituent on the threonine side chain, where β-D-galactose is linked to α-D-galactosamine (GalNAc) through a glycosidic oxygen. The molecule contains the Fmoc carbamate protecting group on the amino functionality and a free carboxylic acid (-COOH), while the sugar hydroxyl groups are masked as acetate esters (Ac) to create a neutral, acylated carbohydrate motif with stereodefined anomeric configurations indicated by β and α. In peptide and glycopeptide synthesis workflows, this protected amino acid is used as a glycosylated building block that provides a protected, stepwise route to incorporate a defined threonine-linked, acetyl-protected galactose-GalNAc motif for subsequent deprotection and downstream conjugation or structural studies.
CAT No: HB00011
Fmoc-L-Thr(((Ac)4-β-D-Gal-O-(Ac)3-α-D-GalNAc)-OH is an Fmoc-protected threonine building block bearing a heavily acetylated, disaccharide-derived glycan side chain (β-D-Gal linked to α-D-GalNAc) via an O-glycosidic linkage. The protected carbohydrate functionality is presented as multiple acetate esters, which supports downstream glycan handling during peptide assembly and later deprotection/functionalization workflows. This reagent is commonly used when constructing glycopeptides where a threonine-linked glycan motif is required for structure-function studies, receptor-binding investigations, or vaccine/bioconjugate development.
1. Glycopeptide Synthesis
Fmoc-L-Thr(((Ac)4-β-D-Gal-O-(Ac)3-α-D-GalNAc)-OH is used as a glycosylated amino acid building block for assembling threonine-linked glycopeptides by Fmoc-based solid-phase peptide synthesis. Researchers incorporate this residue to introduce a defined Gal-GalNAc motif at a specific peptide position, enabling site-specific evaluation of how carbohydrate presentation influences peptide conformation, recognition, and biological interactions. The Fmoc group supports standard peptide coupling and chain elongation, while the multiple acetate protections on the sugar hydroxyls help maintain the glycan integrity during peptide synthesis and minimize side reactions from free carbohydrate alcohols.
2. Carbohydrate-Protein Interaction Studies
Fmoc-L-Thr(((Ac)4-β-D-Gal-O-(Ac)3-α-D-GalNAc)-OH is frequently selected for chemical biology and glycobiology workflows that require synthetic glycopeptide ligands to probe carbohydrate-mediated recognition events. By installing the acetylated Gal-GalNAc side chain on a threonine scaffold, investigators can generate homogeneous glycopeptides for binding assays, competition experiments, and mechanistic studies of lectin-glycan or glycan-protein interactions. The ability to control glycosylation site and glycan identity makes this building block particularly useful for comparing glycoform effects across peptide backbones and for producing material suitable for downstream analytical characterization.
3. Vaccine Antigen and Mimetic Design
Fmoc-L-Thr(((Ac)4-β-D-Gal-O-(Ac)3-α-D-GalNAc)-OH supports the development of glycopeptide antigens and carbohydrate-based mimetics used in preclinical research settings and assay development. Synthetic glycopeptides bearing a Gal-GalNAc motif are commonly used as defined immunogens or as components in multivalent constructs where the carbohydrate epitope must be presented with controlled stereochemistry and attachment position. The protected glycan form provided by the acetates helps maintain the carbohydrate during peptide assembly, after which deprotection or further derivatization can be carried out to generate the intended glycoform for conjugation or immunoassay reagent preparation.
4. Analytical Glycopeptide Standards
Fmoc-L-Thr(((Ac)4-β-D-Gal-O-(Ac)3-α-D-GalNAc)-OH is also used to prepare well-defined glycopeptide standards for LC-MS/MS method development, glycoform identification, and quantitative workflows that require authentic reference material. Because the reagent installs a specific threonine-linked glycan motif, it enables the generation of reference glycopeptides with consistent structure for calibration, retention-time support, and fragmentation pattern benchmarking. Laboratories developing glycomics and glycoproteomics assays often rely on such standards to improve confidence in glycopeptide assignment and to support method robustness across sample sets.
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