8fyr

MicroED structure of Proteinase K from oxygen milled lamellae

spinqualitylabelsall models 8fyr, resolution 1.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8fyr is a 1 chain structure with sequence from Parengyodontium album. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron crystallography, Resolution 1.5Å Ligands: CA, NO3 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PRTK_PARAQ Hydrolyzes keratin at aromatic and hydrophobic residues. Publication Abstract from PubMed Crystallizing G protein-coupled receptors (GPCRs) in lipidic cubic phase (LCP) often yields crystals suited for the cryogenic electron microscopy (cryoEM) method microcrystal electron diffraction (MicroED). However, sample preparation is challenging. Embedded crystals cannot be targeted topologically. Here, we use an integrated fluorescence light microscope (iFLM) inside of a focused ion beam and scanning electron microscope (FIB-SEM) to identify fluorescently labeled GPCR crystals. Crystals are targeted using the iFLM and LCP is milled using a plasma focused ion beam (pFIB). The optimal ion source for preparing biological lamellae is identified using standard crystals of proteinase K. Lamellae prepared using either argon or xenon produced the highest quality data and structures. MicroED data are collected from the milled lamellae and the structures are determined. This study outlines a robust approach to identify and mill membrane protein crystals for MicroED and demonstrates plasma ion-beam milling is a powerful tool for preparing biological lamellae. A robust approach for MicroED sample preparation of lipidic cubic phase embedded membrane protein crystals.,Martynowycz MW, Shiriaeva A, Clabbers MTB, Nicolas WJ, Weaver SJ, Hattne J, Gonen T Nat Commun. 2023 Feb 25;14(1):1086. doi: 10.1038/s41467-023-36733-4. PMID:36841804 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Proteinase 3D structures

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