Journal
ANALYTICAL CHEMISTRY
Volume 95, Issue 25, Pages 9432-9436Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.2c04501
Keywords
-
Categories
Ask authors/readers for more resources
Recently, mass spectrometry methods have been used to quantitatively study protein-ligand interactions by assessing protein structural stability. Different protein-denaturation approaches, such as TPP and SPROX, have their own advantages and challenges. A new method combining protein-denaturation principles with quantitative cross-linking mass spectrometry has been developed, allowing the evaluation of ligand-induced protein engagement. This method has been successfully applied to identify ligand-stabilized cross-linked lysine pairs in bovine serum albumin and ligand bilirubin.
Recently, several mass spectrometry methods have utilizedproteinstructural stability for the quantitative study of protein-ligandengagement. These protein-denaturation approaches, which include thermalproteome profiling (TPP) and stability of proteins from rates of oxidation(SPROX), evaluate ligand-induced denaturation susceptibility changeswith a MS-based readout. The different techniques of bottom-up protein-denaturationmethods each have their own advantages and challenges. Here, we reportthe combination of protein-denaturation principles with quantitativecross-linking mass spectrometry using isobaric quantitative proteininteraction reporter technologies. This method enables the evaluationof ligand-induced protein engagement through analysis of cross-linkrelative ratios across chemical denaturation. As a proof of concept,we found ligand-stabilized cross-linked lysine pairs in well-studiedbovine serum albumin and ligand bilirubin. These links map to theknown binding sites Sudlow Site I and subdomain IB. We propose thatprotein denaturation and qXL-MS can be combined with similar peptide-levelquantification approaches, like SPROX, to increase the coverage informationprofiled for facilitating protein-ligand engagement efforts.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available