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Brodmerkel, Maxim N; Thiede, Lars; De Santis, Emiliano; Uetrecht, Charlotte; Caleman, Carl; Marklund, Erik G
Physical chemistry chemical physics : PCCP, 05/2024, Letnik: 26, Številka: 17Journal Article
Collision induced unfolding (CIU) is a method used with ion mobility mass spectrometry to examine protein structures and their stability. Such experiments yield information about higher order protein structures, yet are unable to provide details about the underlying processes. That information can however be provided using molecular dynamics simulations. Here, we investigate the gas-phase unfolding of norovirus capsid dimers from the Norwalk and Kawasaki strains by employing molecular dynamics simulations over a range of temperatures, representing different levels of activation, together with CIU experiments. The dimers have highly similar structures, but their CIU reveals different stability that can be explained by the different dynamics that arises in response to the activation seen in the simulations, including a part of the sequence with previously observed strain-specific dynamics in solution. Our findings show how similar protein variants can be examined using mass spectrometric techniques in conjunction with atomistic molecular dynamics simulations to reveal differences in stability as well as differences in how and where unfolding takes place upon activation. Ion mobility mass spectrometry and molecular dynamics simulations reveal strain-dependent stability and unfolding in the VP1 dimer from the norovirus capsid.
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