Three-dimensional structure of photosystem I monomer Iron-stress-induced-A supercomplex in a cyanobacteria

February 21, 2023

An opportunity to unravel the evolution of light-harvesting chromoproteins

A research group from Okayama University and RIKEN SPring-8 Center, in collaboration with Kobe University, Tokyo Metropolitan University, and RIKEN CSRS, has succeeded in analyzing the three-dimensional structure of a PSI-IsiA supercomplex derived from cyanobacterium Anabaena sp, using cryo-electron microscopy. They found that the expression and arrangement of IsiA subunits are significantly different from PSI-IsiA supercomplexes in other cyanobacteria. The molecular properties of IsiA in cyanobacteria are expected to serve as an important index for considering the evolution of the photocollection mechanism of photosynthetic organisms.

Original article
Nature Communications doi:10.1038/s41467-023-36504-1
R. Nagao, K. Kato, T. Hamaguchi, Y. Ueno, N. Tsuboshita, S. Shimizu, M. Furutani, S. Ehira, Y. Nakajima, K. Kawakami, T. Suzuki, N. Dohmae, S. Akimoto, K. Yonekura, J.-R. Shen,
"Structure of a monomeric photosystem I core associated with iron-stress-induced-A proteins from Anabaena sp. PCC 7120”".
Naoshi Dohmae
Unit Leader
Biomolecular Characterization Unit