Quantifying the thermodynamics of protein unfolding using 2D NMR spectroscopy

Rita Puglisi, Oliver Brylski, Caterina Alfano, Stephen R. Martin, Annalisa Pastore, Piero Andrea Temussi

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

A topic that has attracted considerable interest in recent years is the possibility to perform thermodynamic studies of proteins directly in-cell or in complex environments which mimic the cellular interior. Nuclear magnetic resonance (NMR) could be an attractive technique for these studies but its applicability has so far been limited by technical issues. Here, we demonstrate that 2D NMR methods can be successfully applied to measure thermodynamic parameters provided that a suitable choice of the residues used for the calculation is made. We propose a new parameter, named RAD, which reflects the level of protection of a specific amide proton in the protein core and can guide through the selection of the resonances. We also suggest a way to calibrate the volumes to become independent of technical limitations. The methodology we propose leads to stability curves comparable to that calculated from CD data and provides a new tool for thermodynamic measurements in complex environments.
Original languageEnglish
Article number100
Journalcommunication chemistry - Nature
Volume3
Issue number1
DOIs
Publication statusPublished - 7 Aug 2020

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