Joule Heating and Thermal Denaturation of Proteins in Nano-ESI Theta Tips

Overview

Journal J Am Soc Mass Spectrom

Specialty Chemistry

Date 2017 Jul 13

PMID 28699064

Citations 5

Authors

Feifei Zhao

Sarah M Matt

Jiexun Bu

Owen G Rehrauer

Dor Ben-Amotz

Scott A McLuckey

Affiliations

Soon will be listed here.

Abstract

Electro-osmotically induced Joule heating in theta tips and its effect on protein denaturation were investigated. Myoglobin, equine cytochrome c, bovine cytochrome c, and carbonic anhydrase II solutions were subjected to electro-osmosis in a theta tip and all of the proteins were denatured during the process. The extent of protein denaturation was found to increase with the applied square wave voltage and electrolyte concentration. The solution temperature at the end of a theta tip was measured directly by Raman spectroscopy and shown to increase with the square wave voltage, thereby demonstrating the effect of Joule heating through an independent method. The electro-osmosis of a solution comprised of myoglobin, bovine cytochrome c, and ubiquitin demonstrated that the magnitude of Joule heating that causes protein denaturation is positively correlated with protein melting temperature. This allows for a quick determination of a protein's relative thermal stability. This work establishes a fast, novel method for protein conformation manipulation prior to MS analysis and provides a temperature-controllable platform for the study of processes that take place in solution with direct coupling to mass spectrometry. Graphical Abstract ᅟ.

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