Structure of a monomeric photosystem I core associated with iron-stress-induced-A proteins from Anabaena sp. PCC 7120

Ryo Nagao (), Koji Kato, Tasuku Hamaguchi, Yoshifumi Ueno, Naoki Tsuboshita, Shota Shimizu, Miyu Furutani, Shigeki Ehira, Yoshiki Nakajima, Keisuke Kawakami, Takehiro Suzuki, Naoshi Dohmae, Seiji Akimoto (), Koji Yonekura () and Jian-Ren Shen ()
Additional contact information
Ryo Nagao: Okayama University
Koji Kato: Okayama University
Tasuku Hamaguchi: RIKEN SPring-8 Center
Yoshifumi Ueno: Kobe University
Naoki Tsuboshita: Okayama University
Shota Shimizu: Okayama University
Miyu Furutani: Kobe University
Shigeki Ehira: Tokyo Metropolitan University
Yoshiki Nakajima: Okayama University
Keisuke Kawakami: RIKEN SPring-8 Center
Takehiro Suzuki: Biomolecular Characterization Unit, RIKEN Center for Sustainable Resource Science
Naoshi Dohmae: Biomolecular Characterization Unit, RIKEN Center for Sustainable Resource Science
Seiji Akimoto: Kobe University
Koji Yonekura: RIKEN SPring-8 Center
Jian-Ren Shen: Okayama University

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract Iron-stress-induced-A proteins (IsiAs) are expressed in cyanobacteria under iron-deficient conditions. The cyanobacterium Anabaena sp. PCC 7120 has four isiA genes; however, their binding property and functional roles in PSI are still missing. We analyzed a cryo-electron microscopy structure of a PSI-IsiA supercomplex isolated from Anabaena grown under an iron-deficient condition. The PSI-IsiA structure contains six IsiA subunits associated with the PsaA side of a PSI core monomer. Three of the six IsiA subunits were identified as IsiA1 and IsiA2. The PSI-IsiA structure lacks a PsaL subunit; instead, a C-terminal domain of IsiA2 occupies the position of PsaL, which inhibits the oligomerization of PSI, leading to the formation of a PSI monomer. Furthermore, excitation-energy transfer from IsiAs to PSI appeared with a time constant of 55 ps. These findings provide insights into both the molecular assembly of the Anabaena IsiA family and the functional roles of IsiAs.

Date: 2023
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DOI: 10.1038/s41467-023-36504-1

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