National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35 GM118110
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
T32 GM135066
米国
National Science Foundation (NSF, United States)
2137424
米国
引用
ジャーナル: Mol Cell Proteomics / 年: 2025 タイトル: Laser-Induced Rehydration of Cryo-Landed Proteins Restores Native Structure. 著者: Keaton L Mertz / Drew Jordahl / Colin A Hemme / Mitchell D Probasco / Dylan S Forbes / Peter L Ducos / Austin Z Salome / Michael S Westphall / Scott T Quarmby / Timothy Grant / Joshua J Coon / 要旨: The use of native mass spectrometry (MS) to land biological molecules for subsequent cryogenic electron microscopy (cryoEM) imaging and three-dimensional reconstruction has gained momentum in recent ...The use of native mass spectrometry (MS) to land biological molecules for subsequent cryogenic electron microscopy (cryoEM) imaging and three-dimensional reconstruction has gained momentum in recent years as a means to overcome long-standing challenges posed by traditional cryoEM sample preparation. However, recent results obtained with this approach have been constrained by low resolution and the compaction of cryo-landed particles, likely due to dehydration during exposure to vacuum. Here, we describe a new sample preparation method that uses a laser integrated into a cryogenic soft-landing apparatus to liquefy precisely deposited amorphous ice, rehydrating particles, and restoring their solution structure prior to rapid revitrification via the thermal mass of the grid. With this technique, we demonstrate the reconstruction of cryo-landed, rehydrated, and revitrified β-galactosidase that is comparable in resolution to that achieved with plunge freezing. Furthermore, these particles are not compacted, matching the known structure and conformation obtained with traditionally plunge-frozen particles. These results establish the viability of coupling native MS with cryoEM for high-resolution structural determination without the limitations imposed by conventional sample preparation, and they open a path to solving previously inaccessible molecules and to integrating MS capabilities such as gas-phase purification to complex samples such as cell lysates.