A new crystal form of the DNA-free full-length XPD helicase from Thermoplasma acidophilum

We present a 2.13 Å resolution structure of DNA-free XPD from T. acidophilum in a novel orthorhombic lattice obtained under high ionic strength conditions. Compared with prior hexagonal forms, this structure features fewer crystal contacts and uniquely resolves loop 510–514. Interestingly, Tyr425 adopts an inward-facing conformation that would clash with DNA, suggesting a possible autoinhibitory role. These findings highlight how crystallization conditions influence lattice stability and reveal functionally relevant conformations.

Sample purification and characterization of the α- and β-crustacyanin pigments from the American lobster for crystallographic and cryo-EM studies

The striking blue colour of the American lobster is caused by proteins that interact with the red pigment astaxanthin, causing its colour change. We have purified and characterized the pigments from the American lobster for crystallographic and cryo-EM studies.

Crystal structure of a tRNA acceptor-stem mimic at 1.94 Å resolution

This paper reports the structure solution of an RNA complex using anomalous scattering.