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Structure paper

TitleA distinct LHCI arrangement is recruited to photosystem I in Fe-starved green algae.
Journal, issue, pagesProc Natl Acad Sci U S A, Vol. 122, Issue 25, Page e2500621122, Year 2025
Publish dateJun 24, 2025
AuthorsHelen W Liu / Radhika Khera / Patricia Grob / Sean D Gallaher / Samuel O Purvine / Carrie D Nicora / Mary S Lipton / Krishna K Niyogi / Eva Nogales / Masakazu Iwai / Sabeeha S Merchant /
PubMed AbstractIron (Fe) availability limits photosynthesis at a global scale where Fe-rich photosystem (PS) I abundance is drastically reduced in Fe-poor environments. We used single-particle cryoelectron ...Iron (Fe) availability limits photosynthesis at a global scale where Fe-rich photosystem (PS) I abundance is drastically reduced in Fe-poor environments. We used single-particle cryoelectron microscopy to reveal a unique Fe starvation-dependent arrangement of light-harvesting chlorophyll (LHC) proteins where Fe starvation-induced TIDI1 is found in an additional tetramer of LHC proteins associated with PSI in and . These cosmopolitan green algae are resilient to poor Fe nutrition. TIDI1 is a distinct LHC protein that co-occurs in diverse algae with flavodoxin (an Fe-independent replacement for the Fe-containing ferredoxin). The antenna expansion in eukaryotic algae we describe here is reminiscent of the iron-starvation induced (encoding) antenna ring in cyanobacteria, which typically co-occurs with , encoding flavodoxin. Our work showcases the convergent strategies that evolved after the Great Oxidation Event to maintain PSI capacity.
External linksProc Natl Acad Sci U S A / PubMed:40523173 / PubMed Central
MethodsEM (single particle)
Resolution2.1 - 3.0 Å
Structure data

48262

9mgw

EMDB-48262, PDB-9mgw:
Dunaliella salina PSI-LHCI-TIDI1 supercomplex
Method: EM (single particle) / Resolution: 3.0 Å

48264

9mgz

EMDB-48264, PDB-9mgz:
Dunaliella tertiolecta PSI-LHCI-TIDI1 supercomplex
Method: EM (single particle) / Resolution: 2.8 Å

48265

9mh0

EMDB-48265, PDB-9mh0:
Dunaliella salina PSI-LHCI supercomplex
Method: EM (single particle) / Resolution: 2.9 Å

48266

9mh1

EMDB-48266, PDB-9mh1:
Dunaliella tertiolecta PSI-LHCI supercomplex
Method: EM (single particle) / Resolution: 2.1 Å

Chemicals

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-CHL:
CHLOROPHYLL B

ChemComp-LUT:
(3R,3'R,6S)-4,5-DIDEHYDRO-5,6-DIHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL

ChemComp-XAT:
(3S,5R,6S,3'S,5'R,6'S)-5,6,5',6'-DIEPOXY-5,6,5',6'- TETRAHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL

ChemComp-BCR:
BETA-CAROTENE

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

ChemComp-LMU:
DODECYL-ALPHA-D-MALTOSIDE / detergent*YM

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

ChemComp-PTY:
PHOSPHATIDYLETHANOLAMINE / phospholipid*YM

ChemComp-SQD:
1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL

ChemComp-3PH:
1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-LMK:
trimethyl-[(2~{R})-1-oxidanyl-1-oxidanylidene-4-[(2~{S})-2-[(1~{S})-1-oxidanyloctadecoxy]-3-[(1~{R})-1-oxidanyloctadecoxy]propoxy]butan-2-yl]azanium

ChemComp-CL0:
CHLOROPHYLL A ISOMER

ChemComp-PQN:
PHYLLOQUINONE

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-4RF:
Tripalmitoylglycerol

ChemComp-HOH:
WATER

ChemComp-OCD:
octadecanal

Source
  • dunaliella salina (plant)
  • dunaliella tertiolecta (plant)
KeywordsPHOTOSYNTHESIS / iron homeostasis / membrane protein / photosystem I / Dunaliella / green alga / PSI-LHCI supercomplex / TIDI / thylakoid iron-deficiency induced protein / photosynthetic apparatus / eukaryotes / iron homeostasis; membrane protein; photosystem I; Dunaliella; green alga; PSI-LHCI supercomplex; TIDI; thylakoid iron-deficiency induced protein; photosynthetic apparatus; photosynthesis; eukaryotes / PHOTOSYNTHESIS; Dunaliella tertiolecta

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