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TitleA distinct double-ring LH1-LH2 photocomplex from an extremophilic phototroph.
Journal, issue, pagesNat Commun, Vol. 16, Issue 1, Page 1410, Year 2025
Publish dateFeb 6, 2025
AuthorsKazutoshi 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 / Zheng-Yu Wang-Otomo /
PubMed AbstractHalorhodospira (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 ...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.
External linksNat Commun / PubMed:39915441 / PubMed Central
MethodsEM (single particle)
Resolution2.2 Å
Structure data

39835

8z81

EMDB-39835, PDB-8z81:
Photosynthetic LH2-LH1 complex from the purple bacterium Halorhodospira halophila
Method: EM (single particle) / Resolution: 2.2 Å

Chemicals

ChemComp-BCL:
BACTERIOCHLOROPHYLL A

ChemComp-LMT:
DODECYL-BETA-D-MALTOSIDE / detergent*YM

ChemComp-CRT:
SPIRILLOXANTHIN

ChemComp-PGV:
(1R)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PALMITOYLOXY)METHYL]ETHYL (11E)-OCTADEC-11-ENOATE / phospholipid*YM

Source
  • halorhodospira halophila (bacteria)
KeywordsPHOTOSYNTHESIS / LH2-LH1 COMPLEX

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