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TitleStructure and evolution of photosystem I in the early-branching cyanobacterium .
Journal, issue, pagesProc Natl Acad Sci U S A, Vol. 122, Issue 20, Page e2427090122, Year 2025
Publish dateMay 20, 2025
AuthorsHan-Wei Jiang / Christopher J Gisriel / Tanai Cardona / David A Flesher / Gary W Brudvig / Ming-Yang Ho /
PubMed AbstractThylakoid-free cyanobacteria are thought to preserve ancestral traits of early-evolving organisms capable of oxygenic photosynthesis. However, and until recently, photosynthesis studies in thylakoid- ...Thylakoid-free cyanobacteria are thought to preserve ancestral traits of early-evolving organisms capable of oxygenic photosynthesis. However, and until recently, photosynthesis studies in thylakoid-free cyanobacteria were only possible in the model strain , limiting our understanding of photosynthesis evolution. Here, we report the isolation, biochemical characterization, cryo-EM structure, and phylogenetic analysis of photosystem I (PSI) from a recently discovered thylakoid-free cyanobacterium, , a distant relative of the genus . We find that PSI exhibits a distinct carotenoid composition and has one conserved low-energy chlorophyll site, which was lost in . Furthermore, PSI in thylakoid-free cyanobacteria has changed at the sequence level to a degree comparable to that of other strains, yet its subunit composition and oligomeric form might be identical to that of the most recent common ancestor of cyanobacteria. This study therefore provides a glimpse into the ancient evolution of photosynthesis.
External linksProc Natl Acad Sci U S A / PubMed:40366692 / PubMed Central
MethodsEM (single particle)
Resolution2.4 Å
Structure data

47359

9e0j

EMDB-47359, PDB-9e0j:
Structure and evolution of Photosystem I in the early-branching cyanobacterium Anthocerotibacter panamensis
Method: EM (single particle) / Resolution: 2.4 Å

Chemicals

ChemComp-CL0:
CHLOROPHYLL A ISOMER

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-1L3:
Menaquinone-4

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-BCR:
BETA-CAROTENE

ChemComp-LHG:
1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / phospholipid*YM

ChemComp-45D:
beta,beta-carotene-4,4'-dione

ChemComp-LMG:
1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE

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

ChemComp-HOH:
WATER

Source
  • anthocerotibacter panamensis (bacteria)
KeywordsPHOTOSYNTHESIS / Photosystem I / evolution / thylakoid-free / chlorophyll / cyanobacteria

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