A distinct double-ring LH1–LH2 photocomplex from an extremophilic phototroph

Kazutoshi Tani (), Kenji V. P. Nagashima, Risa Kojima, Masaharu Kondo, Ryo Kanno, Issei Satoh, Mai Kawakami, Naho Hiwatashi, Kazuna Nakata, Sakiko Nagashima, Kazuhito Inoue, Yugo Isawa, Ryoga Morishita, Shinichi Takaichi, Endang R. Purba, Malgorzata Hall, Long-Jiang Yu, Michael T. Madigan, Akira Mizoguchi, Bruno M. Humbel, Yukihiro Kimura (), Yutaka Nagasawa (), Takehisa Dewa () and Zheng-Yu Wang-Otomo ()
Additional contact information
Kazutoshi Tani: University of Tsukuba
Kenji V. P. Nagashima: Kanagawa University
Risa Kojima: Ritsumeikan University
Masaharu Kondo: Nagoya Institute of Technology
Ryo Kanno: Okinawa Institute of Science and Technology Graduate University (OIST)
Issei Satoh: Ibaraki University
Mai Kawakami: Ibaraki University
Naho Hiwatashi: Ibaraki University
Kazuna Nakata: Kobe University
Sakiko Nagashima: Kanagawa University
Kazuhito Inoue: Kanagawa University
Yugo Isawa: Ritsumeikan University
Ryoga Morishita: Nagoya Institute of Technology
Shinichi Takaichi: Tokyo University of Agriculture
Endang R. Purba: Okinawa Institute of Science and Technology Graduate University (OIST)
Malgorzata Hall: Okinawa Institute of Science and Technology Graduate University (OIST)
Long-Jiang Yu: Chinese Academy of Sciences
Michael T. Madigan: Southern Illinois University
Akira Mizoguchi: Mie University
Bruno M. Humbel: Okinawa Institute of Science and Technology Graduate University (OIST)
Yukihiro Kimura: Kobe University
Yutaka Nagasawa: Ritsumeikan University
Takehisa Dewa: Nagoya Institute of Technology
Zheng-Yu Wang-Otomo: Ibaraki University

Nature Communications, 2025, vol. 16, issue 1, 1-12

Abstract: Abstract Halorhodospira (Hlr.) halophila strain BN9622 is an extremely halophilic and alkaliphilic phototrophic purple sulfur bacterium isolated from a hypersaline lake in the Libyan Desert whose total salinity exceeded 35% at pH 10.7. Here we present a cryo-EM structure of the native LH1–LH2 co-complex from strain BN9622 at 2.22 Å resolution. Surprisingly, the LH1–LH2 co-complex consists of a double-ring cylindrical structure with the larger LH1 ring encircling a smaller LH2 ring. The Hlr. halophila LH1 contains 18 αβ-subunits and additional bacteriochlorophyll a (BChl a) molecules that absorb maximally at 797 nm. The LH2 ring is composed of 9 αβ-subunits, and the BChl a molecules in the co-complex form extensive intra- and inter-complex networks to allow near 100% efficiency of energy transfer to its surrounding LH1. The additional LH1-B797 BChls a are located in such a manner that they facilitate exciton transfer from monomeric BChls in LH2 to the dimeric BChls in LH1. The structural features of the strain BN9622 LH1–LH2 co-complex may have evolved to allow a minimal LH2 complex to maximize excitation transfer to the core complex and effectively harvest light in the physiologically demanding ecological niche of this purple bacterium.

Date: 2025
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DOI: 10.1038/s41467-024-55811-9

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