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Oligosaccharide Assembly

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...

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An Efficient Method for the Synthesis of Peptoids with Mixed Lysine-type/Arginine-type Monomers and Evaluation of Their Anti-leishmanial Activity

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How to extend your (polylactosamine) antennae.

Matthew S Kimber¹

¹Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, Canada.

The Journal of Biological Chemistry

|January 16, 2021

Summary

This summary is machine-generated.

Researchers investigated a key enzyme in synthesizing polylactosamine antennae on eukaryotic glycans. This study provides structural and mechanistic insights into β1-3-N-acetylglucosaminyltransferase 2, crucial for cell recognition and immunity.

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Area of Science:

Glycobiology
Enzymology
Cellular Biology

Background:

Eukaryotic glycans feature elongated antennae built from polylactosamine repeats.
Polylactosamine serves as a platform for glycan modifications and cell-surface antigen presentation.
These structures are vital for cell adherence, development, and immune responses.

Purpose of the Study:

To conduct a detailed structural and mechanistic investigation of β1-3-N-acetylglucosaminyltransferase 2.
To elucidate the role of this key enzyme in polylactosamine antennae synthesis.
To provide insights applicable to other members of the GT31 glycosyltransferase family.

Main Methods:

Structural biology techniques (e.g., X-ray crystallography, cryo-EM) were employed.
Enzymatic assays were performed to study enzyme kinetics and mechanism.
Biochemical and biophysical methods were used to characterize enzyme-substrate interactions.

Main Results:

Detailed structural information of β1-3-N-acetylglucosaminyltransferase 2 was obtained.
Mechanistic insights into the catalytic activity and substrate specificity of the enzyme were revealed.
The findings provide a foundation for understanding the broader GT31 family.

Conclusions:

The study offers critical structural and mechanistic understanding of a key enzyme in glycan antennae synthesis.
These findings advance the comprehension of polylactosamine biosynthesis and its biological significance.
The research paves the way for deciphering other glycosyltransferases within the large GT31 family.