National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01-GM144542
米国
引用
ジャーナル: Proc Natl Acad Sci U S A / 年: 2026 タイトル: Capturing ribosomal structures in cellular extracts with cryoPRISM: A purification-free cryoEM approach reveals novel structural states. 著者: Mira B May / Gabriella S Lopez-Perez / Joseph H Davis / 要旨: Structural analyses of ribosomes by single particle cryogenic electron microscopy (cryoEM) have traditionally relied on purified or reconstituted samples, with particles often trapped in desired ...Structural analyses of ribosomes by single particle cryogenic electron microscopy (cryoEM) have traditionally relied on purified or reconstituted samples, with particles often trapped in desired states using genetic, pharmacological, or biochemical perturbations. While informative, such in vitro methods often fail to capture the full diversity of structural states and associated protein factors present in cells. In contrast, in situ cryoelectron tomography preserves cellular context but is limited by low throughput and modest resolution. Here, we present cryoPRISM (purification-free ribosome imaging from subcellular mixtures), a rapid ex vivo workflow encompassing cell lysis, vitrification, and image analysis methods for high-resolution analyses of ribosomal structures directly from cell lysates. Applying cryoPRISM in , we resolved more than 20 distinct ribosomal states spanning assembly, translation initiation, elongation, trans-translation, and quiescence, including a novel configuration of EF-G bound to idle ribosomes with the ribosome hibernation factor ribosome-associated inhibitor A. Given its speed, accessibility, and ability to preserve native interactions and structural heterogeneity, we anticipate that cryoPRISM will be broadly applicable for uncovering ribosomal biology across diverse organisms and conditions.
名称: Crude cell extract / タイプ: organelle_or_cellular_component / ID: 1 / 親要素: 0 / 含まれる分子: #1-#2 詳細: Frozen cell pellets were lysed under cryogenic conditions using a cryomill. Frozen lysate was resuspended and clarified via centrifugation at 21,000g. DNase I (33 U/mL) was added and crude ...詳細: Frozen cell pellets were lysed under cryogenic conditions using a cryomill. Frozen lysate was resuspended and clarified via centrifugation at 21,000g. DNase I (33 U/mL) was added and crude cell extract was plunge-frozen.