2025/07/10 by Tomoki Imura, Yuhei Hosokawa, Kai-Chun Yang +4 · 1 voice · 1 citation
Biochemistry, Genetics and Molecular Biology · Chemistry · #Carbohydrate Chemistry and Synthesis #DNA Repair Mechanisms #DNA and Nucleic Acid Chemistry
paper · pdf · doi:10.1107/s2052252525006062
openalex publication_date 2025/07/10 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/16
Co-crystal structures of a base-excision DNA-repair enzyme (human 8-oxoguanine DNA glycosylase; hOgg1) in complex with a photocaged 8-oxoguanine DNA lesion were determined before and after uncaging via illumination at 2.81 and 2.48 Å resolution, respectively. The structures were carefully reassessed to rapidly expand the target repertoire of light-triggered time-resolved macromolecular crystallography. Late-intermediate cryo-trapping after uncaging revealed the partial accommodation of 8-oxoguanine in the active site with 68% occupancy, which did not induce full active-site adaptation to the catalytic state. Crystal illumination led to a light-dependent loss of diffraction power, likely due to crystal-packing collapse during the very late reaction stages. This work therefore not only demonstrates that hOgg1 is well suited for time-resolved crystallography, but also that such analysis is necessary to determine further steps in its reaction.