Single Crystal X-ray
Single Crystal X-ray - Related Videos
08:14
Single Crystal and Powder X-ray Diffraction
0 Views •
2023
Source: Tamara M. Powers, Department of Chemistry, Texas A&M University X-ray crystallography is a technique that uses X-rays to study the structure of molecules. X-ray diffraction (XRD) experiments are routinely carried out with either single-crystal or powdered samples. Single-crystal XRD: Single-crystal XRD allows for absolute structure determination. With single-crystal XRD data, the exact atomic positions can be observed, and thus bond lengths and angles can be determined. This...
08:00
Growing Crystals for X-ray Diffraction Analysis
0 Views •
2023
Source: Laboratory of Dr. Jimmy Franco - Merrimack College X-ray crystallography is a method commonly used to determine the spatial arrangement of atoms in a crystalline solid, which allows for the determination of the three-dimensional shape of a molecule or complex. Determining the three-dimensional structure of a compound is of particular importance, since a compound's structure and function are intimately related. Information about a compound's structure is often used to explain its...
09:27
Protein Crystallization for X-ray Crystallography
0 Views •
Cited by 71 •
2011
The 3-D structure of a molecule provides a unique understanding of how the molecule functions. The principal method for structure determination at near-atomic resolution is X-ray crystallography. Here, we demonstrate the current methods for obtaining three-dimensional crystals of any given macromolecule that are suitable for structure determination by X-ray crystallography.
07:54
Preparing Adherent Cells for X-ray Fluorescence Imaging by Chemical Fixation
0 Views •
Cited by 14 •
2015
Here, we present a protocol on how to determine the quantity and distribution of metals in a sample using synchrotron X-ray fluorescence. We focus on adherent cells, and describe the chemical fixation method to prepare this sample. We then describe how to mount and image the sample using synchrotron X-rays.
10:39
Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
0 Views •
Cited by 10 •
2016
The measurement protocol and data analysis procedure are given for obtaining transverse coherence of a synchrotron radiation X-ray source along four directions simultaneously using a single 2-D checkerboard phase grating. This simple technique can be applied for complete transverse coherence characterization of X-ray sources and X-ray optics.
FAQs
Molecular order is essential because it allows the sample to produce a diffraction pattern suitable for structural analysis. When a purified molecule forms an ordered crystal, the X-ray response carries information about its internal arrangement. This relationship connects successful crystal formation directly to obtaining a three-dimensional structural model that can be interpreted at near-atomic resolution.
The diffraction pattern serves as the experimental input, while the electron-density map provides an intermediate representation of atomic locations. Mathematical analysis converts the measured pattern into that map, and the map is then used to build an atomic model. This sequence turns observed X-ray behavior into a three-dimensional description that researchers can interpret biologically.
Near-atomic resolution makes molecular architecture sufficiently visible to examine how proteins, nucleic acids, and ligands adopt specific structures and interact. That level of detail can connect a structure with a proposed molecular mechanism rather than showing only a broad shape. Consequently, the resulting model supports mechanistic research and detailed interpretation of biological interactions.
The workflow begins with a purified biological molecule, which is prepared in a form capable of producing an ordered crystal. The crystal is then exposed to X-rays, and the resulting diffraction pattern undergoes mathematical conversion into an electron-density map and atomic model. Each stage moves from sample preparation to structural interpretation without changing the molecule’s measured architecture.
Structures of mutated or engineered variants can be examined against the architecture of the corresponding biological molecule to identify changes in molecular arrangement or interactions. Because the method provides an atomic model, researchers can relate observed structural differences to questions about molecular behavior. This makes Single Crystal X-ray studies useful for interpreting how sequence changes influence biological mechanisms.
The method reveals how ligands interact with proteins or other biological molecules within a defined three-dimensional architecture. Those structural relationships provide a basis for relating ligand placement and molecular contacts to the surrounding target structure. In turn, researchers can use the information to guide drug-design efforts rather than relying only on the molecule’s composition or overall shape.