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A Bioorthogonal Precision Tool for Human N-Acetylglucosaminyltransferase V
Yu Liu1,2, Ganka Bineva-Todd2, Richard W Meek3,4
1Department of Chemistry, Imperial College London, London W12 0BZ, U.K.
Journal of the American Chemical Society
|September 17, 2024
Summary
Researchers engineered a specific enzyme, N-acetylglucosamine transferase V (MGAT5), to create a bioorthogonal tool for precisely tagging glycoproteins. This advancement allows for targeted labeling in biological systems.
Area of Science:
- Biochemistry
- Glycobiology
- Chemical Biology
Background:
- N-linked glycan elaboration is crucial for human cell physiology.
- N-acetylglucosamine (GlcNAc) incorporation is a key step, with MGAT5 activity linked to cancer.
- The exact function and substrate preference of MGAT5 remain unclear.
Purpose of the Study:
- To engineer a bioorthogonal substrate analog for MGAT5 activity.
- To develop a precisely controllable tool for glycoprotein tagging.
- To elucidate the structural basis of MGAT5 substrate specificity.
Main Methods:
- Chemoenzymatic synthesis of nucleotide-sugar analogs with bioorthogonal side chains.
- Protein engineering of MGAT5 to alter substrate specificity.
- X-ray crystallography and molecular dynamics simulations to determine structural mechanisms.
Main Results:
- Wild-type MGAT5 showed activity towards engineered substrate analogs.
- Engineered MGAT5 variants exhibited altered substrate specificity, favoring azidobutyramide-containing analogs.
- An orthogonal enzyme-substrate pair was successfully developed for bioorthogonal glycoprotein tagging.
Conclusions:
- Protein engineering can create specific MGAT5 variants for bioorthogonal applications.
- The developed orthogonal system enables precise tagging of glycoproteins.
- Structural insights guide the design of novel bioorthogonal chemical tools.
