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Polysialic acids

A Reglero1, L B Rodríguez-Aparicio, J M Luengo

  • 1Departamento de Bioquímica y Biología Molecular, Universidad de León, Spain.

The International Journal of Biochemistry
|November 1, 1993
PubMed
Summary

Polysialic acids, polymers of sialic acids, are crucial in neural development and cell growth. These molecules also function as oncodevelopmental antigens and bacterial virulence factors.

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Area of Science:

  • Glycobiology
  • Developmental Biology
  • Microbiology

Background:

  • Polysialic acids are linear homopolymers composed of N-acetylneuraminic acid (Neu5Ac), N-glycolylneuraminic acid (Neu5Gc), and deaminated neuraminic acid (KDN) residues.
  • These polymers are linked via alpha 2,8, alpha 2-9, or alpha 2,8/alpha 2,9 ketosidic linkages.
  • Polysialic acids are found in diverse biological contexts, including embryonic neural membranes, postnatal kidney, tumors, fish eggs, and bacterial capsules (e.g., Neisseria meningitidis group B).

Purpose of the Study:

  • To elucidate the structure and function of polysialic acids.
  • To understand the biological roles of polysialic acids in development, disease, and bacterial pathogenesis.
  • To explore the synthesis pathways of these complex carbohydrate structures.

Main Methods:

  • Analysis of polysialic acid composition and linkage types.
  • Investigation of polysialic acid presence in various tissues and organisms.
  • Characterization of the enzymatic machinery involved in polysialic acid synthesis.

Main Results:

  • Polysialic acids play a role in neural cell adhesion molecules during embryonic development.
  • They are identified as oncodevelopmental antigens in several tissues and contribute to virulence in bacteria.
  • The synthesis involves sialic acid synthesis, activation to cytidine monophosphate sugar nucleotides, and polymerization by a polysialyl-transferase complex.

Conclusions:

  • Polysialic acids are versatile biopolymers with significant roles in organogenesis and cell growth.
  • Their involvement as oncodevelopmental antigens and bacterial virulence factors highlights their importance in health and disease.
  • Understanding polysialic acid synthesis and function offers insights into developmental processes and potential therapeutic targets.

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