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Glycoconjugates definitions

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  • Glycoconjugate
    Oligosaccharide covalently attached to a non-carbohydrate molecule, such as a lipid or protein, forming a hybrid structure.
  • Oligosaccharide
    Short carbohydrate chain composed of multiple sugar units, often heterogeneous in glycoconjugates.
  • Heterogeneity
    Presence of different types of sugar units within an oligosaccharide, contributing to structural diversity.
  • Directionality
    Characteristic of oligosaccharides with chemically distinct ends, including reducing and non-reducing termini.
  • Reducing End
    Terminal sugar with a free anomeric carbon bonded to two oxygen atoms, capable of forming a hemiacetal group.
  • Non-Reducing End
    Terminal sugar lacking a free anomeric carbon, typically bonded to only one oxygen atom.
  • Glycolipid
    Hybrid molecule consisting of a lipid covalently linked to an oligosaccharide, often involved in cell signaling.
  • Glycoprotein
    Hybrid molecule composed of a protein covalently attached to a small oligosaccharide, found in various cellular locations.
  • Extracellular Matrix
    Complex network outside cells where glycoproteins are commonly located, providing structural and functional support.
  • Plasma Membrane
    Cellular boundary where glycoproteins are present, contributing to cell surface properties and interactions.
  • O-Linked Glycoprotein
    Glycoprotein with oligosaccharide attached via the hydroxyl group of serine or threonine amino acid side chains.
  • N-Linked Glycoprotein
    Glycoprotein with oligosaccharide attached through the amide nitrogen of asparagine amino acid side chains.
  • Glycosidic Bond
    Covalent linkage formed between the anomeric carbon of a sugar and a functional group on another molecule.
  • Anomeric Carbon
    Carbon atom in a sugar ring bonded to two oxygen atoms, crucial for forming glycosidic linkages.
  • Hybrid Molecule
    Structure composed of two distinct molecular types, such as a carbohydrate linked to a lipid or protein.