Introduction to molecular replacement: a time perspective

This article lists the basic crystallographic equations underlying molecular-replacement software. The prospects for future developments are considered, and a brief account of past progress is included.

Likelihood-based estimation of substructure content from single-wavelength anomalous diffraction (SAD) intensity data

An intensity-based likelihood method is provided to estimate scattering from an anomalous substructure considering the effect of measurement errors in Bijvoet pairs and the correlations between these errors.

Crystal and solution structures of a novel antimicrobial peptide from Chrysomya megacephala

The structure of PSK, a novel antimicrobial peptide identified in Chrysomya megacephala larvae, was determined by X-ray crystallography and small-angle X-ray scattering, which revealed a distinct fold compared with published homologous peptides.

Entropic pressure controls the oligomerization of the Vibrio cholerae ParD2 antitoxin

ParD2 forms an open oligomer in solution, the size of which is limited by the presence of an intrinsically disordered tail. In the absence of this tail, ParD2 forms a circular hexadecamer.

Crystal structure of the ferredoxin reductase component of carbazole 1,9a-dioxygenase from Janthinobacterium sp. J3

The crystal structure of the ferredoxin reductase component of carbazole 1,9a-dioxygenase from Janthinobacterium sp. J3 was determined at 2.40 Å resolution.

Crystal structures of Scone: pseudosymmetric folding of a symmetric designer protein

Using computational protein design, a symmetric protein was designed; however, its crystal structures revealed a different pseudosymmetric architecture. Furthermore, one variant was only able to crystallize upon the addition of a polyoxometalate which links individual proteins in the crystal packing.

Structural insights into the interaction of papain-like protease 2 from the alphacoronavirus porcine epidemic diarrhea virus and ubiquitin

Coronaviruses encode a papain-like protease (PLP) which is responsible for antagonizing the innate immune response; here, the structure of the first known Alphacoronavirus PLP bound to ubiquitin, its preferred substrate, is reported.

Crystal structure of human brain-type fatty acid-binding protein FABP7 complexed with palmitic acid

Based on the crystal structure of human fatty acid-binding protein FABP7 in complex with palmitic acid, the recognition of saturated fatty acids by FABP7 is discussed.

Evaluation of automated particle picking for cryogenic electron microscopy using high-precision transmission electron microscope simulation based on a multi-slice method

An automated particle-picking method for cryo-EM and its evaluation using precision TEM simulation based on a multi-slice method are described.

Crystallographic fragment screening-based study of a novel FAD-dependent oxidoreductase from Chaetomium thermophilum. Corrigendum

The article by Švecová et al. [(2021), Acta Cryst. D77, 755–775] is updated.