Protein Microcrystals
Protein Microcrystals - Related Videos
09:09
Preparation and Delivery of Protein Microcrystals in Lipidic Cubic Phase for Serial Femtosecond Crystallography
0 Views •
Cited by 20 •
2016
We describe procedures for the preparation and delivery of membrane protein microcrystals in lipidic cubic phase for serial crystallography at X-ray free-electron lasers and synchrotron sources. These protocols can also be applied for incorporation and delivery of soluble protein microcrystals, leading to substantially reduced sample consumption compared to liquid injection.
09:48
Microcrystal Electron Diffraction of Small Molecules
0 Views •
Cited by 8 •
2021
Here, we describe the procedures developed in our laboratory for preparing powders of small molecule crystals for microcrystal electron diffraction (MicroED) experiments.
09:00
A Sample Preparation Pipeline for Microcrystals at the VMXm Beamline
0 Views •
Cited by 10 •
2021
The signal-to-noise ratio of data is one of the most important considerations in performing X-ray diffraction measurements from microcrystals. The VMXm beamline provides a low-noise environment and microbeam for such experiments. Here, we describe sample preparation methods for mounting and cooling microcrystals for VMXm and other microfocus macromolecular crystallography beamlines.
09:35
Microcrystallography of Protein Crystals and In Cellulo Diffraction
0 Views •
Cited by 9 •
2017
A protocol is presented for X-ray crystallography using protein microcrystals. Two examples analyzing in vivo-grown microcrystals after purification or in cellulo are compared.
08:46
Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli
0 Views •
Cited by 34 •
2015
A streamlined approach to screening for the expression of recombinant membrane proteins in Escherichia coli based on fusion to green fluorescent protein is presented.
FAQs
Supersaturation creates a solution state in which dissolved protein molecules are present at concentrations that favor assembly rather than remaining dispersed. This condition promotes nucleation, the initial formation of an ordered molecular cluster. Once nuclei appear, protein molecules can add to them through controlled crystal growth, producing ordered material suitable for structural analysis.
Precipitant concentration, pH, temperature, and protein concentration strongly influence whether nucleation and growth occur. Adjusting these variables changes the solution environment around the protein and can help favor ordered assembly. Their combined effects determine whether crystals form and how effectively growth is controlled, making condition selection central to obtaining useful microcrystalline samples.
Their micron-scale dimensions reduce the need for extensive crystal growth while preserving molecular order needed for diffraction measurements. This makes structural analysis possible in cases where producing a large single crystal is difficult. The approach expands access to three-dimensional protein structures and supports investigations of molecular shape and organization.
The process begins with a purified protein solution, followed by adjustment of precipitant concentration, pH, temperature, or protein concentration to create supersaturation. These conditions promote nucleation, after which controlled growth produces ordered microcrystalline material. The resulting crystals can then be used in diffraction-based structural analysis rather than requiring prolonged growth into large single crystals.
Diffraction from protein microcrystals can help determine three-dimensional molecular structures. Those structures may reveal the location and features of enzyme active sites, how ligands interact with proteins, and how protein conformations change. Such information connects molecular architecture with biochemical function and helps explain mechanisms of catalysis and molecular recognition.
Protein microcrystals provide ordered samples for serial femtosecond crystallography, a diffraction approach used to determine molecular structures. Their small size is advantageous when extensive crystal growth is impractical, while their internal order still supports structural measurements. This combination helps researchers study proteins that are challenging to prepare as large single crystals.
In enzyme studies, the resulting structures can clarify active-site organization and conformational changes associated with function. When ligands are examined, the data show how molecules interact with protein binding regions. These insights support structure-guided drug development by linking biochemical recognition to three-dimensional features that can inform molecular design.