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Related Concept Videos

Glycocalyx and its Functions01:14

Glycocalyx and its Functions

The glycocalyx is a carbohydrate-rich, fuzzy-appearing layer on the outer surface of the cell membrane. It is highly hydrophilic, because of this it attracts large amounts of water to the cell's surface. This aids the cell's interaction with the watery environment and also helps it to obtain substances dissolved in the water. It is also important for cell identification, self/non-self determination, and embryonic development and is used in cell-to-cell attachments to form tissues.
Components of...
Protein Glycosylation01:25

Protein Glycosylation

Glycosylation, the most common post-translational modification for proteins, serves diverse functions. Adding sugars to proteins makes the proteins more resistant to proteolytic digestion. Glycosylated proteins can act as markers and receptors to promote cell-cell adhesion. Additionally, they have many essential quality control functions in the cell, such as correct protein folding and facilitating transport of misfolded proteins to the cytosol, which can be degraded.
Glycosylation occurs in...
Proteoglycans01:05

Proteoglycans

Glycans, a class of complex heterogeneous molecules, can be covalently attached to proteins to form glycosylated proteins that regulate various physiological and pathological processes. Glycosylated proteins or glycoproteins comprise N-linked and O-linked oligosaccharides. O-glycosylation is the most common type of protein glycosylation. Here, glycans attach to the oxygen atom of the hydroxyl groups of Serine or Threonine residues. O-linked glycosylation occurs later in protein processing,...
Selectins01:25

Selectins

Cell adhesion is  an essential aspect of multicellularity. While stable cell interactions usually occur between cells of the same type, transient cell interactions occur between cells of different tissue types, such as between neutrophils and endothelial cells. Selectins are one class of cell adhesion molecules (CAMs) that bind carbohydrate ligands to form transient cell adhesion. They are rod-like proteins with a long extracellular part of variable length ending with the lectin domain, which...
Oligosaccharide Assembly01:24

Oligosaccharide Assembly

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.
Multiple sugar molecules that may or may...
Membrane Carbohydrates01:30

Membrane Carbohydrates

The plasma membrane is a dynamic barrier composed of lipids, proteins, and carbohydrates. It is the epicenter of many cellular processes required for cell growth and survival. Carbohydrates have unique structural and chemical properties that help the plasma membrane to carry out its functions effectively.
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Bioinformatics Resources for the Study of Glycan-Mediated Protein Interactions
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Mammalian galectins: structure, carbohydrate specificity, and functions.

E M Rapoport1, O V Kurmyshkina, N V Bovin

  • 1Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997, Russia.

Biochemistry. Biokhimiia
|May 7, 2008
PubMed
Summary

This review discusses galectins, which are beta-galactoside binding proteins. It covers their structure, specificity, and roles in cell adhesion, immunity, inflammation, and cancer.

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Area of Science:

  • Biochemistry
  • Immunology
  • Molecular Biology

Background:

  • Galectins are a conserved family of beta-galactoside-binding lectins.
  • They share homology in their carbohydrate-binding site sequences.
  • Galectins play diverse biological roles.

Purpose of the Study:

  • To review the literature on galectin structure and carbohydrate specificity.
  • To discuss the involvement of galectins in key biological processes.

Main Methods:

  • Literature review of scientific publications.
  • Analysis of data on galectin structure and function.

Main Results:

  • Detailed discussion of galectin structural features.
  • Elucidation of carbohydrate-binding specificities for various galectins.
  • Exploration of galectin involvement in cell adhesion regulation.
  • Examination of galectin roles in immune response and inflammation.
  • Consideration of galectin influence on cancer progression.

Conclusions:

  • Galectins exhibit diverse structures and specificities.
  • They are critical regulators of cell adhesion.
  • Galectins are implicated in immune responses, inflammation, and cancer.