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A Glycal-Based Photoaffinity Probe That Enriches Sialic Acid Binding Proteins

preprint
submitted on 17.07.2019 and posted on 18.07.2019 by Peter Thuy-Boun, Dennis Wolan

To identify sialic acid binding proteins from complex proteomes, three photocrosslinking affinity-based probes were constructed using Neu5Ac (5 and 6) and Neu5Ac2en (7) scaffolds. Kinetic inhibition assays and Western blotting revealed the Neu5Ac2en-based 7 to be an effective probe for the labeling of a purified gut microbial sialidase (BDI_2946) and a purified human sialic acid binding protein (hCD33). Additionally, LC-MS/MS affinity-based protein profiling verified the ability of 7to enrich a low-abundance sialic acid binding protein (complement factor H) from human serum thus validating the utility of this probe in a complex context.

Funding

1R21AI139744

FP917296-01-0

History

Email Address of Submitting Author

wolan@scripps.edu

Institution

The Scripps Research Institute

Country

USA

ORCID For Submitting Author

0000-0001-9879-8353

Declaration of Conflict of Interest

The authors declare no competing financial interests.

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Read the published paper

in Bioorganic & Medicinal Chemistry Letters

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