Download MendeleyDose-dependent structural and electron-density features in the lytic polysaccharide monooxygenase NcAA9D.
Miller, S.A., O'Dell, W.B., Meilleur, F.(2026) Acta Crystallogr D Struct Biol 82: 900-914
- PubMed: 42517195 Search on PubMedSearch on PubMed Central
- DOI: https://doi.org/10.1107/S205979832600639X
- Primary Citation Related Structures:
9Z8O, 9Z8P, 9Z8Q, 9Z8R, 9Z8S, 9Z8T, 9Z8U, 9Z8V, 9Z8W, 9Z8X, 9Z8Y, 9Z8Z, 9Z90, 9Z92, 9Z93, 9Z94, 9Z95, 9Z96, 9Z97, 9Z98, 9Z99, 9ZA5, 9ZA6, 9ZA7, 9ZA8, 9ZA9, 9ZAA, 9ZAB, 9ZAC, 9ZAD, 9ZAE, 9ZAF, 9ZAH, 9ZAI, 9ZAJ, 9ZAL, 9ZAM, 9ZAN, 9ZAQ, 9ZAR, 9ZAS - PubMed Abstract:
Structural studies of copper-containing lytic polysaccharide monooxygenases (LPMOs) by X-ray crystallography are often complicated by radiation damage. In this study, we analyze a series of 36 X-ray crystal structures of NcAA9D, a Neurospora crassa AA9-family LPMO, determined from data collected at cryogenic temperature from a single crystal to investigate the progressive effects of radiation damage at the active site of this enzyme. We report new insights into the dose-dependence of active-site geometry in LPMOs and utilize the unique pre-bound dioxygen site of NcAA9D to analyze the impact of X-ray dose on the electron density of this species. It is well established that photoreduction of the LPMO active-site copper(II) leads to expulsion of its water ligands. We further characterize this displacement and the corresponding electron-density smearing, a phenomenon that can lead to the erroneous modeling of copper-bound dioxygen species. These findings suggest that radiation-dose series collected from a single crystal provide invaluable data to support unambiguous assignment of radiation-sensitive intermediates at the active site of LPMOs and other radiation-sensitive redox enzymes.
- Department of Molecular and Structural Biochemistry, North Carolina State University, 128 Polk Hall, Raleigh, NC 27695, USA.
Organizational Affiliation:
