Widening the reach of structural biology

An exciting future is outlined in which new approaches complementary to conventional X-ray crystallography will substantially widen the reach of structural biology. Primary among these are the recent advances in cryoelectron microscopy and the growing applications of free electron lasers.

Cracks observed to propagate discontinuously on the millisecond timescale

Ultra-fast diffraction and phase contrast imaging experiments on crack propagation in silicon, reported in the current issue of IUCrJ, are reviewed in the light of our present knowledge and its industrial importance.

In cellulo serial crystallography of alcohol oxidase crystals inside yeast cells

The application of serial femtosecond crystallography to naturally occurring peroxisomal protein crystals within yeast cells is described. The concept of utilizing peroxisomes for the production of protein nanocrystals is outlined.

Four- and five-component molecular solids: crystal engineering strategies based on structural inequivalence

A logic driven synthetic approach is used in this first report of the isolation of stoichiometric four-component molecular solids. A possible extension to a five-component solid is also described.

Quaternary cocrystals: combinatorial synthetic strategies based on long-range synthon Aufbau modules (LSAM)

A combinatorial synthetic approach is described for the isolation of quaternary cocrystals. The strategy outlines chemical and geometrical modulations in the long-range synthon Aufbau modules (LSAMs) to systematically increase the number of components.

Real-time direct and diffraction X-ray imaging of irregular silicon wafer breakage

Crack propagation in an Si wafer under thermal stress is depicted by combining diffraction and transmission X-ray imaging. The use of synchrotron radiation allows for the high imaging frame rates required to follow the crack dynamics in real time.

High-resolution neutron and X-ray diffraction room-temperature studies of an H-FABP–oleic acid complex: study of the internal water cluster and ligand binding by a transferred multipolar electron-density distribution

Neutron and high-resolution X-ray crystallography were used to determine fully the structure of the internal water cluster in H-FABP. Analysis of the orientation and electrostatic properties of the water molecules showed significant alignment of the permanent dipoles of the water molecules with the protein electrostatic field.

Whole-pattern fitting technique in serial femtosecond nanocrystallography

Extracting structure-factor moduli from diffraction patterns of protein nanocrystals is one of the critical issues of serial femtosecond X-ray crystallography. Unlike a conventional crystallography experiment, serial femtosecond crystallography combines data from hundreds or thousands of crystals of varying size and quality, a situation reminiscent of powder diffraction. Here the whole-pattern fitting technique, originally designed for one-dimensional powder diffraction crystallography, has been reconsidered and applied to the analysis of higher-dimensional serial femtosecond X-ray crystallography data. For nanocrystals with a small number of unit cells, the whole-pattern fitting approach is shown to be more accurate than integration-based Monte Carlo methods.

The crystalline sponge method updated

The protocols of the crystalline sponge method, particularly those in the soaking, data collection and refinement processes, are considerably improved to give reliable structural information.

Binary and ternary cocrystals of sulfa drug acetazolamide with pyridine carboxamides and cyclic amides

The first report of a ternary cocrystal acetazolamide–nicotinamide–pyridone (1:1:1) for a sulfonamide drug with amide coformers.