Engineering topics
Bogan, Michael J.
Publications and source records attributed to Bogan, Michael J..
Single-shot diffraction data from the Mimivirus particle using an X-ray free-electron laser
Free-electron lasers (FEL) hold the potential to revolutionize structural biology by producing X-ray pules short enough to outrun radiation damage, thus allowing imaging of biological samples without the limitation from radiation damage. Thus, a major part of the scientific case for the first FELs was three-dimensional (3D) reconstruction of non-crystalline biological objects. In a recent publication we demonstrated the first 3D reconstruction of a biological object from an X-ray FEL using this technique. The sample was the giant Mimivirus, which is one of the largest known viruses with a diameter of 450 nm. Here we present the dataset used for this successful reconstruction. Data-analysis methods for single-particle imaging at FELs are undergoing heavy development but data collection relies on very limited time available through a highly competitive proposal process. This dataset provides experimental data to the entire community and could boost algorithm development and provide a benchmark dataset for new algorithms.
Apparatus and method for nanoflow liquid jet and serial femtosecond x-ray protein crystallography
Techniques for nanoflow serial femtosecond x-ray protein crystallography include providing a sample fluid by mixing a plurality of a first target of interest with a carrier fluid and injecting the sample fluid into a vacuum chamber at a rate less than about 4 microliters per minute. In some embodiments, the carrier fluid has a viscosity greater than about 3 centipoise.
Concentric-flow electrokinetic injector enables serial crystallography of ribosome and photosystem II
In this paper, we describe a concentric-flow electrokinetic injector for efficiently delivering microcrystals for serial femtosecond X-ray crystallography analysis that enables studies of challenging biological systems in their unadulterated mother liquor. Finally, we used the injector to analyze microcrystals of Geobacillus stearothermophilus thermolysin (2.2-Å structure), Thermosynechococcus elongatus photosystem II (<3-Å diffraction) and Thermus thermophilus small ribosomal subunit bound to the antibiotic paromomycin at ambient temperature (3.4-Å structure).
Anomalous Behavior of the Homogeneous Ice Nucleation Rate in “No-Man’s Land”
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Reabsorption of Soft X-Ray Emission at High X-Ray Free-Electron Laser Fluences
Not Available
Natively Inhibited Trypanosoma brucei Cathepsin B Structure Determined by Using an X-Ray Laser
Abstract Not Provided
Self-terminating Diffraction Gates Femtosecond X-ray Nanocrystallography Measurements
Abstract Not Provided
Time-resolved Protein Nanocrystallography Using an X-ray Free-electron Laser
Abstract Not Provided
Serial time-resolved crystallography of photosystem II using a femtosecond X-ray laser
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Structure of a photosynthetic reaction centre determined by serial femtosecond crystallography
Abstract Not Provided
Serial femtosecond X-ray diffraction of 30S ribosomal subunit microcrystals in liquid suspension at ambient temperature using an X-ray free-electron laser
High-resolution ribosome structures determined by X-ray crystallography have provided important insights into the mechanism of translation. Such studies have thus far relied on large ribosome crystals kept at cryogenic temperatures to reduce radiation damage. Here, the application of serial femtosecond X-ray crystallography (SFX) using an X-ray free-electron laser (XFEL) to obtain diffraction data from ribosome microcrystals in liquid suspension at ambient temperature is described. 30S ribosomal subunit microcrystals diffracted to beyond 6 Å resolution, demonstrating the feasibility of using SFX for ribosome structural studies. The ability to collect diffraction data at near-physiological temperatures promises to provide fundamental insights into the structural dynamics of the ribosome and its functional complexes.
Sacrificial Tamper Slows Down Sample Explosion in FLASH Diffraction Experiments
Abstract Not Provided