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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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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.
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Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan...
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Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin,...
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In cellular metabolism (the complete breakdown of glucose to extract energy),  glycolysis is the first step. Glycolysis takes place in the cytoplasm of both prokaryotic and eukaryotic cells. Glucose enters heterotrophic cells in two ways. One method is through secondary active transport, where the transport takes place against the glucose concentration gradient. The other mechanism uses a group of integral proteins called GLUT proteins, also known as glucose transporter proteins. These...
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Processivity in Bacterial Glycosyltransferases.

Liubov Yakovlieva1, Marthe T C Walvoort1

  • 1Stratingh Institute for Chemistry , University of Groningen , 9747 AG Groningen , The Netherlands.

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Summary

This review explores processive enzymes in pathogenic bacteria, focusing on how their sugar transfer mechanisms impact bacterial virulence and offer potential targets for new antibiotics.

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Area of Science:

  • Glycobiology and enzymology
  • Bacterial pathogenesis and virulence factors
  • Drug discovery and inhibitor design

Background:

  • Extracellular polysaccharides and glycoproteins are crucial for bacterial virulence, aiding in adherence, biofilm formation, and immune evasion.
  • Understanding the enzymes involved in synthesizing these glycans is key to identifying novel antibiotic targets.
  • Enzymatic processivity, regulating glycan/glycoprotein length and structure, is an important, understudied aspect of bacterial glycans.

Purpose of the Study:

  • To review examples of processive enzymes in bacterial pathogens involved in glycan polymerization and transfer.
  • To highlight the biochemical methods used to study enzyme processivity.
  • To emphasize the importance of studying processivity for understanding bacterial virulence mechanisms and designing inhibitors.

Main Methods:

  • Literature review of published research on processive enzymes in bacterial pathogens.
  • Analysis of biochemical methods employed to study enzyme mechanism, substrate binding, and processivity.
  • Focus on enzymes involved in polymerization and transfer of sugar moieties.

Main Results:

  • Detailed examples of various processive enzymes involved in bacterial glycan synthesis are presented.
  • Biochemical approaches for studying enzyme processivity are discussed.
  • The link between enzyme processivity and bacterial virulence is explored.

Conclusions:

  • Studying enzyme processivity is essential for elucidating bacterial virulence mechanisms.
  • Understanding processivity provides a basis for rational inhibitor design against bacterial pathogens.
  • This review underscores the significance of processivity in bacterial glycobiology and antibiotic development.