A Systematic Study of Selective Protein Glycation
- PMID: 30290036
- DOI: 10.1002/anie.201810037
A Systematic Study of Selective Protein Glycation
Abstract
Glycation is a non-enzymatic post-translational modification (PTM) that remains poorly understood, largely because it is unknown how it occurs selectively. Using mass spectrometry, it was possible to evaluate total glycation levels, identify distinct glycated products, assign unique glycation sites, and correlate these data with chemical and structural features for a panel of proteins glycated in vitro. It was determined that the extent of glycation does not correlate with pKa or surface exposure at reactive sites. Rather, the data reveal that primary sequence dictates the overall likelihood that a site will become glycated, while surrounding structure further sculpts the glycation outcome. Clustered acidic residues were found to prevent glycation, whereas a combination of tyrosine and polar residues appear to promote glycation. This work contributes important new knowledge about the molecular features that govern selective glycation.
Keywords: advanced glycation end-product; chemoselectivity; glycation; methylglyoxal; protein modification.
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
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