How Photosynthesis Survives Extreme Light: Cryo-EM Structure of Photosystem II Revealed

Our colleagues have contributed to a new publication in the prestigious journal Nature Communications, presenting a high-resolution cryo-EM structure of Photosystem II from the extremely phototolerant green microalga Chlorella ohadii. The study reveals how specific structural adaptations of the photosynthetic apparatus enable this organism to thrive under exceptionally high light intensities. In particular, the work uncovers a remarkably rigid PSII core and unique antenna organization that together provide efficient photoprotection without relying on classical protective mechanisms. The research combines advanced cryo-electron microscopy, biophysics, and spectroscopy and was carried out in close collaboration with the Department of Biophysics, Faculty of Science, Palacký University. These findings significantly advance our understanding of how photosynthetic systems can adapt to extreme environmental conditions. The publication also highlights the strength of interdisciplinary and international collaboration at our department.

Nat Commun. 2026 Jan 9;17(1):341. doi: 10.1038/s41467-025-65861-2