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Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
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Discrimination between sialic acid linkage modes using sialyllactose-imprinted polymers.

Liliia Mavliutova1, Bruna Munoz Aldeguer1, Jesper Wiklander2

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Researchers developed novel molecularly-imprinted polymers (MIPs) for early cancer diagnosis by creating selective sialic acid sensors. These polymers can distinguish between different sialic acid linkages, a key indicator in cancer progression.

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Area of Science:

  • Biomaterials Science
  • Analytical Chemistry
  • Glycobiology

Background:

  • Aberrant glycosylation, specifically altered sialylation, is a hallmark of cancer progression.
  • Developing selective sensors for sialic acid glycoforms is crucial for early cancer detection.

Purpose of the Study:

  • To create molecularly-imprinted polymers (MIPs) with high affinity and selectivity for sialic acid.
  • To differentiate between various sialic acid linkages (glycoforms) for improved cancer diagnostics.

Main Methods:

  • Utilized boronate chemistry and imidazolium-based monomers to target sialic acid.
  • Investigated monomer-template interactions using 1H NMR titration and explored counterion effects.
  • Synthesized MIPs as microparticles via a combinatorial approach.

Main Results:

  • Identified optimal Br- and Na+ counterions for high affinity interactions.
  • Confirmed boronate ester formation with specific stoichiometries (1:2) between sialyllactose and boronic acid.
  • Developed MIPs exhibiting selectivity for sialic acid linkages in an aqueous environment.

Conclusions:

  • The developed MIPs demonstrate potential as selective recognition elements for sialic acid glycoforms.
  • This approach offers a promising strategy for developing advanced biosensors for cancer diagnosis.
  • The study highlights the importance of counterion selection in optimizing MIP performance.